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We offer the best product range of Four Channel Led Running Light Circuit, Touch Sensitive Alarm, Earthquake and Vibration Alarm, Listening Bug Circuit and Shadow Alarm.

Four Channel Led Running Light Circuit

  • Type Circuit
  • Shape Rectangular
  • Feature Durable
  • Finishing Polished
  • Warranty 6 Months
  • Quality Good

Four Channel Led Running Light Circuit is a series that exhibits LED’s flashing effect sequentially. In many applications such as model roadway, running light effects are observed. This simpleFour Channel Led Running Light consists of 16 LED’s in a pair of four. The four groups of LED are named as A, B, C, D glows simultaneously one by one. The frequency of Four Channel Led Running Light can be changed by preset P1 shown in the circuit diagram. The controlling circuit is build around decade counter, whose four outputs are used here. The circuit automatically resets when IC1 reaches to fifth count. The clock and triggering circuit are designed around five mono-stable multi vibrators in IC2.

About the Circuit :
The circuit diagram of four-channel running light is shown in figure. The clock pulses generated by one of the mono-stable multi vibrator whose frequency determined by R1/P1/C1 are given to clock input terminal (pin14) of IC1. IC1 being a decade counter starts counting. The output at pin 3, 2, 4, 7 becomes logic high sequentially. When count reaches to pin10 or bit Q4, IC1 gets reset and counting starts again. The logic generated at pin 3, 2, 4, 7 of IC1 is given to four mono-stable multi vibrators in IC2. The outputs of IC2 are given to transistors as T1, T2, T3, T4, which drives four group of LED’s as A, B, C, D. Thus A, B, C, D will go on flashing sequentially. Toggle switch S1 is used as a mode selector to reverse the emitting position of LED. This effect can be view as a running light effect. Fig1 shows the combination of two LED’s in series and two LED’s in parallel configuration. And you can use number of LED’s as per your requirement in four channels. The current limitor resistor in between LED combination and collector of transistor changes the value as per the supply voltage and current consumption of LED. The value of current limitor resistor should be smaller than given in part list. Fig2 shows the sequential arrangement of LED’s. A pair of LED’s is in series in each four-channel combination. If one wants to connect more number of LED’s then, it should be connected after every fourth channel configuration as shown in fig 2, which is connected to point a after fourth channel. If number of LED’s increases, then the current limitor resistor value should be smaller than part list. This is the method to connect more number of LED’s in place one. This connection should be made properly at point A, B, C and D respectively.

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Settable On Off Long Duration Timer Circuit

  • Type Circuit
  • Material Plastic
  • Certification CE Certified
  • Application Commercial, Indistrial
  • Color Available in Many Colors
  • Voltage 110V, 220V
  • Automatic Grade Automatic

Settable On Off Long Duration Timer Circuit is useful in turning air conditioner ON and OFF as per the requirement to reduce the power consumption without affecting the cooling considerably. Settable On/Off Long Duration Timer gives you adjustable ON & OFF timings from minutes to hours e.g. 4 minutes ON, 15 minutes OFF or 70 minutes ON, 10 minutes OFF. Other applications of this circuit can be household water pump ON/OFF, compressor ON/OFF in any compressed air system, blower ON/OFF in explosive gas environment.


About the circuit :
The circuit is built around two CMOS 4060 IC’s both working as independently settable oscillator cum counter /divider. Pin 9 & 10 have R, C components which decides the frequency of oscillator. This oscillator frequency is fed to chain of binary counters (14) through a resistance (R1, R6). Pin 7 is the output of fourth counter. LEDs D5, D6 indicates the clock pulses. Relay driver T3 is driven by pin 3 (last counter output) of  IC2.When pin 3 of IC2 goes high, IC2 output is latched by pulling down pin11 through T2 and LED D6 becomes steady. ON time starts here. Hi state at pin 3 drives the relay ON. At the same instance IC1 is resets through C2, R5 & oscillation and counting of IC1 starts. LED D5 starts pulsating. IC1 timing progresses. When pin 3 (of IC1) goes high IC2 gets reset pulse through C4, R10. Oscillator and counter of IC2 start again. LED D6 starts pulsating. Pin 3 of IC2 goes low on reset. Relay is switched OFF. ON time (IC1 timing) ends.IC2 oscillations start and the timing progresses through the chain of counters. The last output of counters that is pin 3 output goes high after the set (P2) timing i.e. OFF time. Load can be connected to NO and P ( Pole) of the relay output. The Relay can switch current up to 5 Amps. Settable On/Off Long Duration Timer can be set ON time & OFF time separately with relay O/P.

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Listening Bug Circuit

  • Type Bug Circuit
  • Color Available in Many Colors
  • Use Electrical
  • Finishing Polished
  • Feature Durable
  • Warranty 6 Months

We are offering Listening Bug circuit .how great, if you are able to listen the people sitting in the adjoining room. Our listening bug provides an effective way to this imagination. Listening bug is a very simple and inexpensive circuit uses an operational amplifier ic 741 (ic1) and push-pull amplifier using transistors for amplification of a signal.


About the circuit :
The sound signals generated in the nearby room (even at a distance of 5 meters) are received by condenser microphone shown in the circuit diagram. The microphone converts the sound signals into electrical signals that are amplified by ic1. The output is again amplified by push pull amplifier, which consists of npn and pnp transistors namely t1 and t2 respectively. This amplified output is then given to 8w loudspeaker, which converts these electrical signals into corresponding sound signals that can be heard.

Note :
The microphone should be placed near to pcb for good results. If you want to locate it at 6 to 8 inches longer then shielding cable must be used with respect to ground for good results.

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Touch Sensitive Alarm

  • Size 20x50inch, 22x55inch, 26x65inch
  • Material Aluminium, Fiber
  • Shape Rectangular
  • Thickness 10-15mm, 15-20mm, 25-30mm
  • Color Available in Many Colors
  • Voltage 110V, 220V

Touch Sensitive Alarm can be used in a variety of applications. But, the most practical application is for intruder detector. The circuit uses Schmitt Trigger Inverter IC1, together with a self -oscillating piezo-electric buzzer and handful of other components. Our esteemed customers can avail Touch Sensitive Alarm at economical price.

About the Circuit :
IC1 consists of six inverters, out of which five are used here. One of the inverter forms an oscillator with frequency around 1MHz. The frequency is determined by R1/C2. The oscillator output is given to second inverter, which in turn is AC coupled to a full wave rectifier circuit. As long as the door handle (or a metal plate) is left untouched, the oscillator output will alternately switch the input above and below its two trigger voltages. Output will thus switch alternately low and high at clock rate to drive the rectifier circuit.

When metal plate is touched, most of the signal from the oscillator will be capacitively shunted to the shield ground, which forms a pseudo earth. As a result, output of at pin6 becomes high, transistor T1 becomes on and buzzer sounds an alarm. It remains on as long as contact is made with the door handle. Also, LED D4 lights, which gives visual indication. Simple delay network consisting of P1, C1, and D3 provides minimum delay when momentary contact is made with the touch plate. The delay is varied from 2 to 20 seconds with the aid of P1.

Note : External shield ground must be provided to a small aluminium foil for effective sensitivity only in case of a battery supply.

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Earthquake and Vibration Alarm

  • Material Metal
  • Warranty 6 Months
  • Type Alarm
  • Shape Rectangular
  • Feature Durable

Earthquake/Vibration Alarm converts mechanical vibration into electrical vibration and gives alarm. The Piezo electric sensor is used to sense any kind of vibration /jerk. It produces small ac signal when activated by a jerk or vibration. Since it is very sensitive to any kind of vibration it can serve as earthquake alarm also. A piezo electrical sensor is available in market in the form of a round disc. It has two terminals for output. When we want to use it, it can be placed on the surface or can be adhered to the surface with the help of cello tape or a general purpose chemical adhesive. When the surface encounters any vibrations, these are transferred to this piezo sensor and it produces a signal.

About The Circuit :
A simple circuit is built around a 555 timer IC. The output from sensor is fed to a transistor T1. Capacitor C1 and Resistor R1 act as fixed bias to the transistor T1. T1 amplifies the signal and delivers amplified output at the collector. This output is again fed to another transistor through ac coupling in order to further amplify the signal. Since T1 is weekly biased, it automatically rectifies the ac signal and only pulsating dc waveform is amplified and delivered by T2. Output of this T2 is fed to trigger input of IC555 through capacitor C3. Capacitor C3 differentiates the rising and falling edge of the signal produced at the collector of T2. The positive going pulse will not have any effect on trigger input. However negative going pulse will trigger the timer and produce HI state at its output. This HI state will glow LED D1. Also buzzer starts sounding when the sensor signal is detected. The 555 configuration is a monostable flipflop and the signal goes on retriggering this monostable. Therefore output is continuously available as long as signal is present. VR1 sets the sensitivity of the circuit and VR2 sets the timing of the monostable. If the trigger pulses which triggers the mono are  generated at delayed intervals, the output may not be continuous. TO make it continuous at even the lowest frequency of signal, VR2 should be set. The circuit can be powered either from 9 v battery or from mains through eliminator.

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Shadow Alarm

  • Type Alarm
  • Material Metal
  • Use Safety
  • Feature Durable
  • Finishing Polished
  • Warranty 6 Months

Shadow Alarm detects moving shadow on LDR and starts a melodious sound alarm. This shadow alarm can be used as a simple burglar alarm that produces a loud beep when somebody crosses a protected area or door. The circuit is highly sensitive and can detect the shadow of the moving person from a distance of 1 meter. It does not require an aligned light beam to make the circuit standby. The beep generated from the circuit will be loud enough to detect the entry of a person in the room or the protected area being guarded. It is portable and can be places anywhere for monitoring.

About The Circuit :
The circuit uses a voltage comparator and a monostable timer to give the warning alarm on detecting a moving person. IC LM741 (IC1) is used as a voltage comparator with two potential dividers in its inverting and non-inverting inputs. Resistors R2 and R3 provide half-supply voltage of near about 4.5 volts to its inverting input (pin 2). LDR1 and preset VR1, R1 form another potential divider to provide a variable voltage input to the non-inverting input (pin 3). If VR1 is properly adjusted for the required light level, the output of IC1 will be high, which drives pnp transistor T1 out of conduction. This is due to the high potential at the base of T1. The emitter voltage of T1 will be high in this condition, which inhibits IC2 from oscillation and LED1 from lighting. IC2 is wired as a monostable timer. VR2 and C1 provide a preset time delay. As a person crosses the protected area, his shadow will be sensed by LDR1 due to change in the light intensity level and the voltage at the non-inverting input of IC1 will drop momentarily. The output of IC1 suddenly becomes low, allowing T1 to conduct. This triggers the monostable (IC2) and the alarm sounds. Adjust preset VR1 until LED1 turns off at the particular light level. Keep LDR1 facing the entrance of the room or the area to be protected. Sensitivity of the circuit depends on the proper adjustment of VR1. If VR1 is correctly adjusted, the circuit can detect a moving person from a distance of about 1-3 meters.

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Microcontroller Based LED Multieffect Cheaser

  • Type LED Multieffect Cheaser
  • Use Industrial
  • Shape Rectangular
  • Finishing Polished
  • Warranty 6 Months
  • Quality Good

Microcontroller Based LED Multieffect Cheaser operates on Blink of eight LEDs with the software of PIC 16F84A. Five pins from RA0 to RA4 are used as the input pin. (i.e. R11 To R15).

These pins are pull-uped with 10K ohm resisters. So, when a switch isn't pushed, the input becomes H level (+5V) and when a switch is pushed, it will become L level ( 0V ). When the switch closes, the chattering occurs. The chattering is the phenomenon which occurs with the bound of the point of contact. The opening and shutting of a point of contact is repeated in short time.

We don't put the prevention circuit of the chattering at the circuit this time. When the software detects that the switch is closed once, the blink processing of LEDs are executed in the time which is longer than the chattering. Eight pins from RB0 to RB7 are used for the output pin.

The anode side of the LED is connected with +5 V and the cathode side is controlled by PIC via the resistor. So, when the output of PIC is H level (+5V), the LED goes out and when the output of PIC is L level (0V), the LED lights up we using high brightness type LED to make an current flow little.

Note :

  • This is the circuit which used 10-MHz resonator.
  • Easy to operate
  • 3 terminal regulator is used to get +5V output from +12V power in
  • Because it is suppressing the current of the LED, a 100 mA-type regulator is enough
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Infrared Burglar Alarm Circuit

  • Material Plastic
  • Color Available in Many Colors
  • Feature Durable
  • Voltage 110V
  • Application Office Security
  • Warranty 1Year

Infrared Burglar Alarm gives alarm on interruption of IR beam. The entry of undesirable person from the gate produces an alarm which is much more pronounced and the alarm can be either fitted inside the house or outside as desired. By using this circuit, residents need not spend on watchdog or watchman to restrict the entry of unwanted elements. This IR circuit i.e. transmitter and receiver is mounted on two side of gate. The intruder while passing through the gate obstructs the IR (non visible) beam and produce a remote alarm to be fitted as desired by the house owner.

About the circuit :

  • The transmitter IC 555 wired in astable mode provides the pulsed power to IR LED D4. The frequency is settable with the help of P3, R10 is current limiting resistor. IC 555 is economical element to make this circuit. Since the modulated high pulse power enables long range sensing, it is common practice to pulsed IR technique.
  • IR LED D4 transmits the modulated light which falls on receiver which is kept aligned with transmitter. Alignment accuracy need not be very high and minor misalignment may not produce any malfunction. Receiving IR module IRX receives IR light energy and produces electrical pulses its output. These pulses are buffered and inverted by transistor T1. Now these low going pulses triggers a monostable ckt based on IC2 which is again a 555 IC. The frequent triggering and retriggering produces D.C. output at pin 3 of IC2. P1 is provided to adjust the monostable timing such that output at pin 3 is continuously Hi (IR pulses retrigger the monostable before mono output goes low after expiry of its timing). This output is fed to a melody generator IC 3 (UM66). Pin 2 of IC is a supply pin and when IC2 output is Hi, IC3 gets supply through 3.3V zener and produces melodious output through the speaker and driver transistor T2.
  • IC2 power is regulated through a 5 volt regulator so that its output will not give undesirable level above 5 volts and save D3 zener as well as IC3.
  • The power input for regulator is derived from centretapped transformer 6-0-6 rectifier and filler is provided on board.
  • The transmitter is powered from a 9V battery.
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Four Channel On Off Control Circuit

  • Material Frp
  • Application Control Panels
  • Color Available in Many Colors
  • Automatic Grade Automatic
  • Tensile Strength 0-25Mpa
  • Feature Easy To Install
  • Warranty 1 Year

We are a noted Manufacturer and Supplier of Four Channel On/Off Control Circuit in India. This four-channel control uses only one D type latch IC1, and some associated circuitry to control four different gadgets. To control more devices, identical circuits, in multiples, can be used. IC1 consists of eight latches, out of which four are used here. The circuit incorporates the following features :

  • Individual ‘on/off’ control for all channels.
  • Emergency ‘off’ control for all channels.
  • Immediate ‘on’ control for all channels
  • LED indication for ‘on’ channels
  • Optional push-to-on buttons or tectile switches.  


About the Circuit :

  • When one presses the ‘on’ switch (S1) of channel-1, a logic low is applied to data input D0 (pin3). The same level appears on the data output Q0 (pin2). Because latch enable pin LE (pin11, active high) is connected to +5V, and the output enable OE (pin1, active low) is pulled down using resistor R9. At the same time, Q0 output is fed back to D0 input, which thus keeps the common junction of D0 and Q0 at low level, even after releasing ‘S1’. This low level is applied to the base of transistor T1 through diode D9 to turn it on, and relay RL1 activated. LED D13 glows indicate that channel-1 is ‘on’. The other channels can also be switched on, as desired, in a similar manner.
  • To switch of channel-1, ‘off’ switch ‘S5’ of channel-1 is pressed to apply logic high to junction of D0 and Q0. Because of the feedback from Q0 to D0 junction remains high even after releasing the switch S5. As a result, relay RL1 is deactivated and LED D13 also goes off.
  • In the case of emergency, press the emergency off switch ‘S9’ to disable all the outputs of IC1. The outputs of IC1 are in high impedence state, all the relays gets deactivated.
  • If all the channels are to be switched on simultaneously, a ‘low’ logic level is applied via diodes D9 through D12 to data input D0 to D3 by pressing S10 to activate all the relays.
  • ON/OFF four channels, with ‘All ON’ and ‘All OFF’ facility
  • Details

    The following table will help you to select the channel and corresponding on/off switch.

    Channel On Switch Off Switch
    Channel-1 S1 S5
    Channel-2 S2 S6
    Channel-3 S3 S7
    Channel-4 S4 S8
    All Channels S9 S10

     

    Power Supply : It requires +5V DC supply for circuit operation and +12V for activating the relay as shown in the circuit diagram. 

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Infrared Remote Switch Circuit

  • Type Circuit
  • Material NBR, PVDF
  • Voltage 200VDC, 230VAC
  • Application Home Use, Industrial Use
  • Operating Temperature 0-20deg C, 20-40deg C
  • Frequency 50HZ, 60Hz

We are a noted Manufacturer and Supplier of Infrared Remote Switch Circuit in India. The circuit described here can be used for any simple on/off function such as controlling a lamp or fan. The major advantage is that this circuit is absolutely free from ambient light interference and provides controlled range of about 10 mt without the use of any focusing lens. Transmitter and receiver circuits are described below:

Transmitter Circuit :
Transmitter section consists of a power supply, an oscillator and an output stage. The circuit diagram for transmitter is shown in fig. IC1 is wired as an astable multivibrator with a center frequency of about 26 KHz. When switch S1 is pressed, the circuit gets energized, output of IC1 is a square wave. The infrared LED connected at its output transmits IR beams modulated at the same frequency. The oscillator frequency can be shifted slightly by adjusting preset VR1.

Receiver Circuit :

  • Receiver section comprises power supply an infrared detector module, time delay circuit with noise filter, bistable flip-flop and an output section. The IR signal from the transmitter is sensed by the sensor and output at pin 2 goes low. This in turn switches on transistor T1. Consequently, capacitor C8 starts charging through resistor R5. When voltage across capacitor C8 reaches about 3.5V, IC2 receives a clock pulse at pin 14 and its output at pin2 goes high. As a result T2 becomes on, whish energizes relay RL1. The output of IC2 is also used for lighting the LED D5 indicating the presence of a signal.
  • When ON signal is available output of sensor goes high and T1 is switched OFF. Now capacitor C8 starts discharging through R6 and voltage across it decreases to zero. When another signal arrives after about 300miliseconds capacitor C8 again charges through R5 and IC2 gets another clock pulse. But its reset through diode D4, the output at pin2 toggles.
  • If another pulse arrives from the transmitter before a delay of about 300ms, T1 again turns ON and voltage across C8 cannot fall below 1.5V i.e. maximum input voltage required to sense a logical low by IC2. Hence, the output of IC2 does not change. This feature prevents false triggering. R5, C8 network provides immunity against IR noise. IC3 is a regulator IC that provides a regulated voltage.


Protect the circuit :
High frequency produces a lot of harmonics act as a source sustained noise. To minimize this effect, the sensor should be covered with a dark red glass plate light from other sources like fluorescent lamps. IR candescent lamps and sunlight do not have any effect on the circuit.

Calibration :

  • If LED D5 does not glow, adjust preset VR1 till it glows. Gradually increase the distance and fine-tune the preset for maximum range.
  • ON/OFF switch by remote from 10mtr distance.
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Mini Project Kit

Amongst the prominent Mini Project Kit Manufacturers and Suppliers in Maharashtra, India, our name stands distinguished owing to the quality we offer. We have a newfangled infrastructure for developing the Mini Project Kits of the premium quality. Each component in this kit is made to precision to add to its usability for the longer run. Inside the kit, you will also find an instruction manual. We are committed to providing quality at every front, be it for the products or the services. Thus, we make sure that the Mini Project Kits are safely delivered at your doorway within the pre-decided time frames. 

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Musical Entrance Alarm

  • Type Entrance Alarm
  • Material Metal
  • Shape Rectangular
  • Use Industrial
  • Feature Eco Friendly
  • Finishing Polished

Musical Entrance Alarm has a musical light operated burglar alarm. The circuit generates musical tone when light falls on LDR gets interrupted. This can be used to detect an unknown person when he tries to open the door. Working of the circuit is based on LDR and musical tone generator IC APM993D (IC1). LDR triggers IC 993D when light falls on it gets interrupted by a person. IC 993D is a programmed 1024 note ROM memory, which generates 16 musical tunes. It has inbuilt oscillator as well as preamplifier circuit.

About the circuit :

  • In the presence of light, the resistance of LDR is very low. The voltage developed at pin4 of IC APM993D due to preset VR1 and LDR is insufficient to trigger IC1.
  • When light falling on LDR is obstructed, it's resistance increases to a very high value. Now voltage at pin4 becomes sufficient to trigger the bell. If it does not, then reduce the resistance of the preset by adjusting its wiper till the circuit functions properly.
  • With the preset at a low resistance, the bell rings continuously. On the contrary, when it has a high resistance, the bell will not ring even by blanking LDR.
  • Transistor T1 is used as an amplifier driver connected to on chip preamplifier output at pin14 to drive 8W loudspeakers directly.
  • Speed calibration :   Resistor R3 controls the speed at which tune is played. By changing value of R3, speed can be varied.
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Two Digit Counter Circuit

  • Type Circuit
  • Shape Square
  • Color Available in Many Colors
  • Feature Durable
  • Warranty 6 Months
  • Packaging Type Packed in Box

Two Digit Counter Circuit is used as model racetracks. As compared to mechanical lap counters, which suffers from poor contacts or the mechanism easily jam, this electronic lap counter is based on the principle characteristics of phototransistor. Hence, it has very high reliability and efficiency. The counter can count maximum 99 laps, which can be preset to individual requirements. The display is shown on two 7-segment displays.

About the Circuit :
The circuit uses six ICs and two 7-segment displays. The triggering circuit is built around IC1, which consists of four NAND gates and phototransistor T1. IC2 and IC3 are used as a counter ICs, IC4, and IC5 are used to drive two 7-segment displays.

When any object passes the “checkpoint”, it interrupts the light falling T1. T1 has a feature that in presence of light it has very low resistance but when light falls on it interrupted its resistance increases to a very high value. Hence the flip-flop designed around IC1 gets set, which provides clock input to IC2. Now IC2 starts counting. After counting from 0 to 9 it gives clock input to IC3 and now IC3 starts counting. Thus, we can count maximum 99 laps. The output of IC2 and IC3 are in BCD form. To convert this BCD logic into 7-segment display, IC4 and IC5 are used, which are BCD to 7-segment display driver. The display is reset by pressing switch S1.

Power can be restored and the counter reset by pressing the Reset switch RS. The phototransistor T1 should be mounted in a cylindrical tube to screen it from ambient light, which might otherwise keep the phototransistor resistance low and block the circuit. The sensitivity may be adjusted by P1.

Power Supply :
The circuit requires a DC power supply of 5V, which is designed using regulator IC6. Diodes D1 and D2 are used as a rectifier diode and capacitor C1 are used as a filter capacitor.

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Microcontroller Based Seven Segment Number Selector

  • Type Number Selector
  • Shape Rectangle
  • Application Electronic
  • Color Metallic
  • Feature Durable
  • Warranty 1 Year
  • Lighting Type Led

Microcontroller (89C51) Based Seven Segment Number Selector displays 0 to 9 numbers by pressing push on switches. This circuit is a simple application built around the seven segment display. The circuit has ten inputs corresponding to digits zero to nine. Whenever an input is pressed the corresponding digit is displayed on the seven segments. The microcontroller used is AT89C51 which belongs to the 8051 series of microcontroller. The circuit can be divided into two units: the controller unit and the display unit. The controller unit consists of a microcontroller circuit. The microcontroller used here is AT89C51. The display unit consists of a seven segment circuit which is interfaced to the microcontroller. The circuit is similar to the seven segment circuit with the only difference that here we have ten input pins. Each input pin corresponds to one of the digits to be displayed on the seven segments. Here the pin 0 to pin 7 of port P3, pin 6 and pin 7 of port P 1 are made the input pins. The output is sent to the seven segments through Port 2 of the microcontroller.

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Sound Operated Timer Circuit

  • Type Timer Circuit
  • Shape Square
  • Feature Durable
  • Finishing Polished
  • Warranty 6 Months
  • Quality Good

We are offering Sound Operated Timer Circuit. The circuit described here is that of an electronic switch which can be operated by sound of a clap. The circuit can be used in sound operated motor-driven toy car or any other gadget as per requirement.

About the circuit :
the circuit uses the timer ic, a condenser mic. The mic is used to convert the sound signal into electrical signal. These signals are amplified by transistor t1 and given to the ic the output of ic1 is from pin number3 which is used as reference input of transistor t2 which is used to drive the relay.
with a clap a relay will be energized and will remain on as per setting of vr1.the minimum time for which it would remain on is two minutes and maximum is five minutes, which is sufficient for a toy car. If the on time of relay is to be increased then the value of c3 will be increased and delay wants to decrease then the value of c3 should be less.
it can be operated on 6v to 12v dc after changing the relay according to required voltage.

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Light Operated Switch

  • Shape Rectangular
  • Application Electrical
  • Color Available in Many Colors
  • Surface Finishing Coated
  • Feature Easy To Fit, Electrical Porcelain
  • Warranty 1 Year
  • Puncture Voltage 10amp, 15amp, 5amp

Light Operated Switch is a very commonly used circuit to control outside lighting or used for driveways and garage entrances. Light Operated Switch is very simple and inexpensive design, which uses timer IC555 (IC1) and Light Dependent Resistor or LDR as a sensor. LDR has unique feature that in presence of light it has very low resistance. However, when light falls on it is interrupted, its resistance increases to a very large value. This feature is used to trigger IC1, which operates in monostable mode.

About the Circuit :
In presence of light, LDR or R3 as shown in the circuit diagram has very low resistance. Hence, voltage at trigger pin2 of IC1 is above 1/3Vcc. In this case, the output of IC1 at pin3 remains low and relay is not energized.

As soon as light falls on LDR gets obstructed due to the movement of some objects, the voltage at pin2 goes below 1/3Vcc. At this moment, IC1 is triggered and the circuit is switched on. The output at pin3 becomes high and relay is energized. The output remains high as long as light is obstructed.

 

Here diodes D3 and D4 are used as a rectifier diode and capacitor C3 as a filter.

Calibration :
The preset VR1 is used to adjust the sensitivity of the circuit. Initially make lights off on LDR and slightly go on adjusting VR1, till the circuit is switched on.

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Griposcope Circuit

  • Type Circuit
  • Material Metal
  • Use Industrial
  • Feature Eco Friendly
  • Finishing Polished
  • Warranty 6 Months

Griposcope Circuit makes it possible to know the muscle power. Griposcope can also be used as a lie detector and moisture level monitoring or simply for conjuring tricks.

Two probes are left to calibrate you. Hold them tight. As you, increase your grips on these wires, the LED dot jumps into lower order. The stronger the grip, lower the position of the dot. If you cannot keep a steady hand, the LED dot oscillates up and down.

About the Circuit :
Griposcope is designed using linear voltage display IC3914 (IC1). Griposcope consists of 11 comparators and associated network in a single chip packed.

The resistance of the body RB, applied to the input pin 5 of IC1 changes according to the grip of the leads. The proportional voltage is applied to the inverting input of each 11 comparators, which compares this voltage with non-inverting voltage set by battery, pot VR1 and chain of 1K resistors internally designed. Depending on the output of comparators, corresponding LED will flash. The position of glowing LED changes with the change in resistance across points X and Y. As the position of glowing LED increases, strength decreases. Glowing of Green LED D1 indicates minimum strength.

Calibration :
Preset VR1, VR2, and resistor R1 can set the sensitivity and the range of deviation. In the absence of body resistance RB, VR1 is adjusted so that LED D10 glows.

Note on Probe Wires :
Two highly insulated wires such as multimeter probes, can act as a sensor. The area of contact between the probes and skin plays an important role in varying the resistance between them.

Power Supply :
A mains derived power supply is not used for the circuit. Operational voltage is derived from two 1.5V batteries. The operation of the device becomes critical if the supply voltage falls below 2.25V approximately.

Resistor R2 sets the current to around 1mA through the LED. The power set by the device is well below 40mW in all the positions.

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Dual Power Supply Circuit

  • Type Power Supply Unit
  • Certification ISI Certified
  • Application Computer Use, Electronic Goods, Power Supply
  • Color Available in Many Colors
  • Frequency 50hz, 60hz
  • Power 0-250W, 250-500W
  • Feature Easy To Install, Electrical Porcelain
  • Phase Double

The Dual Power Supply Circuit gives regulated Dual output of ±5V to ±15V and is available at a reasonable price of Rs 380/-. One often realizes the need for power supplies, which provide dual positive and negative output rails. This is particularly true with circuits, which contain operational amplifiers. Such devices require closely regulated supply rails of typically ±5V, ±9V, ±12V or ±15V. Integrated circuit voltage regulators are available in a range of output voltages and usually feature internal fold-back current limiting as well as thermal shut-down. A simple method of meeting such a requirement is shown in figure. Here two fixed voltage regulators of opposite polarity, are used in conjunction with a dual secondary transformer and single bridge rectifier. The current rating of the regulators should be greater than, or equal to, the maximum load current. Circuits which are solely based on operational amplifiers rarely require supply currents in excess of 100mA and thus 78XX/79XX series regulators will usually be adequate. The IC number and transformer rating for different output voltages are given in table.

About the Circuit :
As shown in the circuit diagram, AC input is given through transformer. The transformer rating depends on the output DC voltage as shown in the table. The AC output voltage obtained from the transformer, is rectified through bridge rectifier designed using four diodes D1 to D4. Capacitors C1 and C2 are used to filter the AC signal. The rectified filtered output is given to regulator IC1 and IC2. The output of IC1 and IC2 gives the fixed DC voltage depending on the voltage capability. This output is again filtered through capacitor C5 and C6. LED D5 and D6 glows, which indicates positive and negative output.

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Overhead Tank Controller

  • Type Tank Controller
  • Use Industrial
  • Material Metal
  • Feature Eco Friendly
  • Shape Rectangular
  • Finishing Polished

In many places such as hostels, apartments, school/colleges, hospitals, etc, overhead tanks are used for storing the water. As the requirement of water is large, controlling of tank is very important. Overhead Tank Controller is a specially designed circuit to overcome this problem. Overhead Tank Controller has two sensors named as HIGH and LOW immersed into the tank with reference, which is at positive potential. The motor is on until the tank is full. When it reaches to HIGH level, the motor automatically turns OFF and it remains OFF until water level goes below LOW sensor and then it becomes on again. Thus, Overhead Tank Controller prevents the overflow of water.

About the Circuit :

  • The circuit is designed using IC1, which consists of four AND gates and IC2, which is used in bistable mode. The HIGH and LOW sensors are connected to one of the input of two AND gates at pin 8 and 12 respectively. Other inputs are connected to positive supply through resistors. The output of these two AND gates at pin10 and 11 are given to input of another AND gate at pin 5 and 6. The output of this AND gate at pin4 is given to threshold input pin6 of IC2. The trigger input pin2 of IC2 receives input from LOW sensor.
  • When the tank is empty, logic of AND gate and input of LOW sensor make pin6 and pin2 of IC2 are low. IC2 gets set, output at pin3 goes high which in turn makes transistor T1 on, and relay energized. When water reaches to LOW level, output at pin3 of IC2 remains unchanged and relay remains on. When water reaches to HIGH level, pin6 of IC2 becomes high which resets IC2. Output at pin3 goes low and relay goes off. It remains off until water level goes below LOW sensor and then becomes on again.
  • LED D2 gives the visual indication of relay on or off. When D2 glows indicates that the relay is on. When it turns off indicates that the relay is off.
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Twilight Switch Circuit

  • Material Plastic
  • Color Available In Many Colors
  • Type Circuit
  • Power supply AC 230 V.
  • Relative Humidity 20 to 90% non-condensing
  • Operating Temp 14 to 160 F (-10 to 71 Degree C)
  • Storage Temp 14 to 160 F (-26 to 71 Degree C)

Twilight Switch is a light dependent switch, which automatically turns ON when it gets dark. This is one of the simplest light dependant switch, which automatically turns on when it gets dark. It is based on the characteristics of light sensitive resistor R1. During the day time, the value of R1 is very low. But in dark, it has very high value. This feature makes this simple circuit to operate as an automatic twilight switch.

About the Circuit :

  • When it gets dark, the value of R1 increases, whereupon transistor T1 switches off. Transistor T2 then switches on and relay connected at the collector of T2 becomes on. Also LED D2 glows, which gives the visual indication.
  • Capacitor C1 serves to make the switch insensitive to brief changes in ambient darkness such as caused by passing a car with its headlights blazing.
  • The light dependent resistor R1 should be such that its day light resistance should be of the order of a few hundred ohms; this should increase to about 10KW at twilight. In any case, the value of P1 may be increase.


Calibration :

  • During calibration, unsolder C1 from earth, the circuit then resets faster. Preset P1 is used to increase the sensitivity of the circuit.
  • The circuit draws a current of 5mA plus the relay current.
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Toilet Lamp Controller

  • Type Lamp Controller
  • Material Metal
  • Use Industrial
  • Feature Eco Friendly
  • Finishing Polished
  • Warranty 6 Months

Many people forget to switch off lights, especially the toilet light at night. This results in wastage of electric power. Toilet Lamp Controller is specially designed to overcome this problem. After switching on the toilet lights, Toilet Lamp Controller automatically turns off the lights after a few minutes, which can be preset to individual requirements. You can set timing from 20 sec to 5 min.

About the Circuit :
Toilet Lamp Controller is built around the popular timer IC, used in monostable mode. For triggering in this mode, the IC requires a negative pulse, which brings the trigger input below 1/3Vcc. The normally low output then goes high for a period determined by the RC network comprising VR1, R1, and R2. The output pulse length is 1.1RC seconds approximately.

The tolerance of timing components makes it impossible to get highly accurate timing. This is overcome by the inclusion of potentiometer P1. The threshold voltage, which is 2/3Vcc can be raised or lowered to get accurate timing by P1.

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Electronic Dice

  • Use Electronic
  • Feature Eco Friendly
  • Shape Rectangular
  • Finishing Polished
  • Quality Good
  • Packaging Type Packed in Boxes

Our esteemed customers can avail Electronic Dice from us. A dice when thrown can take any position to give the players random number out of six. The effect can be very well experienced and even commercially exploited to play actual game of electronic dice with this kit.

 

In the conventional game, a dice is thrown and the player watches what position it takes out of six possible positions. The dice needs to be positioned randomly at every throw. This effect is practically implemented by a small inexpensive electronic circuit.

About the Circuit :

  • The circuit is built around two ICs namely 4029 (up/down Counter) and 40106 an inverting Schimitt Trigger. A schimitt trigger inverter, N1 from 40106 is used to produce oscillations. A simple RC square wave oscillator is built using this gate. The frequency of oscillations depend upon R1, C1.
  • When power is applied to the circuit before pressing S1, pin 7 i. e. TC (terminal count) output is  Hi and N2 makes pin 1 LO. As soon as S1 is pressed, clock is applied to clock input of 4029 (pin 15). Now the counter starts counting in binary, UP counter mode (Pin 9, 10 are pulled Hi).
  • The three outputs of this binary counter are used to drive three columns  of two LEDs each and a single LED. D1, D2, D3 and D4 will become ON simultaneously by virtue of pin 14 of 4029 going Lo. D5, D6 forms the next group, which is driven from output pin 11 of 4029, and D7 is driven from third output pin 6.
  • Four Schmitt trigger input gates N3-N6, which were left unused, are now used to drive LEDs through limiting resistances R3-R6. The circuit starts with random outputs glowing and after completing a binary cycle of 8 clock pulses, loads the levels from logic inputs 4, 12, 13 to 6, 11, 14 outputs and thereafter run in binary counter sequence. Thereafter LEDs goes on glowing as per the counter outputs, which looks random by virtue of physical placements of LEDs on PCB. This means the LEDs (say D1, D2 ) are placed not in any type of sequence as per the counter outputs but are placed randomly ( D1 at bottom and D2 at top).  
  • As soon as the switch is released, counter stops getting clock pulses and thus the counter’s output states get frozen. The outputs, which are LO, drive the corresponding LED/LEDs and the corresponding number of dots gets displayed.
  • The frequency of LED flashes can be altered by suitably changing R1, C1.
  • The circuit can be powered from 9v battery or a DC power derived from mains through eliminator.
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Room Air Freshener Circuit

  • Size Multisizes
  • Type Circuit
  • Certification CE Certified
  • Color Available in Many Colors
  • Feature Eco Friendly
  • Automatic Grade Automatic
  • Shape Rectangular
  • Warranty 6 Months

Today the ‘fresh air’ can only be imagining. Because, nowadays due to the big industrial developments, the air becomes so polluted that most of the people have to suffer from lot of diseases. But now because of the magic of this small unit, you may say bye-bye to all of these disorders. Although it has lot of advantages, it is a very simple and inexpensive circuit that the people can use it very easily for several years. Room Air Freshener Circuit works on the principle of ionization, which, helps to remove polluted air

Pure air has positive and negative ions in 1:1 ratio approximately. Air becomes polluted due to the ionic imbalance. Ionic imbalanced air has less negative ions and more positive ions. The idea mainly employs here is to apply a high negative voltage, several KV in fact, to a sharply pointed emitter. The negatively charged air is repelled from the emitter resulting in an ‘ion breeze’ you will feel if you put your hand close to the ionizing point.

About the Circuit :

  • In the present design, there is a ladder of resistors and capacitors to step up the voltage up to a few KV. The justification for these cumbersome process appears to be little more than the reduction in size of the ladder capacitors achieved by running the oscillator at a fairly high frequency. The ladder runs directly from the mains.
  • The circuit works at 50Hz instead of 50 KHz or so is that 1N4007 rectifiers can be used. Ordinary rectifiers are not too keen to work at high frequencies, the main reason being there painfully slow reverse recovery time, which begins to degrade the circuit performance at frequencies as low as 2 KHz in the case of a 1N4007. Readers may be interested in the results of applying a sine wave of increasing frequency to the circuit.
  • The main idea behind this is that the charge is transferred backwards and forwards from one row of capacitors to the other on each main cycle, but always moving further up the chain because of the action of the rectifiers. When all the capacitors are fully charged, there will be a voltage across each of them equal, in theory to the peak-to-peak voltage of the mains.
  • In practice, the regulation of this type of circuit is very poor, and the full voltage will never be measured because of leakage, corona discharge, and so on. The tiny ionizing current is quite enough to drop the output voltage to about -4KV, which by a strange coincidence is the ideal output voltage from an air ionizer. Voltages above this level tend to produce ozone rather than ions, whereas voltages much lower will not ionize the air efficiently. Touching the emitter directly is enough to reduce the voltage to almost nothing.


Testing :

  • A simple tester can be made from a 10KpF capacitor and a neon bulb. Plug in the circuit, and if all is well, its own neon lamp will glow and a few seconds later you will hear a soft hiss from the emitter. If you hold one lead of the tester and move it towards the tip of the emitter, the neon bulb on the tester will begin to flash when its free lead is about ½” from the emitter, and will flash faster as it is brought closer. The flashing is not very bright, so it won’t show in the direct sunlight.
  • If the power on LED D33 light unplugs the unit at once and touch the mains plug to the emitter to remove any residual charge on the capacitors. Check the mains plug to the emitter to remove any residual charge on the capacitors.
  • If LED D33 glows, but the emitter does not hiss and the tester’s neon does not flash, remove the emitter wire and try to get a sharper point on it. If there is no sign of activity at the emitter at all, check again for a solder bridge between tracks, one of the diodes back to front, a short circuit in one of the capacitors, or a dry solder joint.


Precautions :
Although the circuit as a whole has a very high output resistance, individual capacitors don’t work, so please take care when you are testing the circuit. The capacitors will retain their charge for some time after the circuit is unplugged, and a painful shock can be received from the back of the PCB if you are careless. The circuit can be discharged by touching the mains plug to the ionizing point for a few seconds, and just to be certain you can run the mains plug down the line of diode connections on the PCB.

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Clap Switch

  • Material Metal
  • Use Industrial
  • Color Available in Many Colors
  • Feature Eco Friendly
  • Finishing Polished
  • Warranty 6 Months

Nowadays sound operated switches becomes very common in our modern life. Here is a simple and inexpensive design of clap operated switch, which is very easy to assemble by hobbyists at any level. With this circuit, the device switches on by first clap and it switches off by the next clap. The circuit is designed using four transistors and a very few number of components. About the Circuit: The sound signals generated by making a clap are received by condenser microphone, shown in the circuit diagram. Microphone converts these sound signals into equivalent electrical signals. These signals are amplified by transistors Q1, Q2 and Q3. The amplified signal is given to driver transistor Q4. During the first clap, Q4 turns on and relay connected to the collector of Q1 gets energised. On next clap, Q4 turns off and relay goes off. Again when the next clap comes, the procedure repeats as above.C1, C2 & C3 are coupling capacitors. D6 LED indicate the realy is on condition.

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Liquid Level Indicator With Alarm Kit

  • Type Liquid Level Indicator
  • Application Testing Water Level
  • Certification ISI Certified
  • Display Type Analog
  • Feature Accuracy
  • Measuring Range 100-200mm, 200-300mm
  • Gauge Diameter 20-40mm, 40-60mm

The name of the project itself suggests its application. Liquid Level Indicator With Alarm can be used for level control in hydro culture project. It is also used for kitchen purpose like detecting the level of water in washing machine. The main feature of this circuit is that it shows each level in meaningful English letters. It displays letter ‘E’ for Empty, ’L’ for Low, ’H’ for Half, ’A’ for Above Average and ‘F’ for Full Tank. The sensors for each level are immersed in tank. The other end is connected through four NOR gates N1 to N4 which uses IC 4001(IC1). The output is then given to IC 4055 (IC2) which is BCD to seven segment display driver IC. The level of fluid is indicated on 7- segment display. Also when the tank is full, the piezobuzzer raises a noticeable alarm.

About the Circuit :
As shown in the circuit diagram, when tank is low, N1 of IC1 gives output high, whereas N2, N3 are at logic zero. Their logics are applied to BCD inputs of IC2. Hence IC2 drives 7- segment display according to the BCD Code present at inputs. For low level BCD logic is ‘1010’. For this logic, display will indicate ‘L’. As the level increases, BCD logic changes, and display will indicate accordingly. That is ‘H’ for half and ‘A’ for above average. You can see the code generation table or logic table.

Note that there is no display pattern like ‘E’ or ‘F’ available from IC2. Therefore to obtain these pattern transistors T1 and T2 are used. These transistors blank out the unnecessary segments from 7- segment display. It can be seen that the letter ’E’ is generated by blanking ‘b’ and ‘c’ segments while it decodes digit ‘8’. Letter ‘F’ is obtained by blanking segment ‘b’ while it decodes letter ‘P’.

In addition the piezobuzzer connected to transistor T3 raises alarm when tank is full. In this case, N4 of IC1 gives logic high and makes T3 to conduct.

Note :

  • The circuit should not be used with inflammable or highly reactive fluids.
  • Indicates the level of water on 7-segment display with audible warning when level is full.
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Quizmaster Board

  • Type Board
  • Material Wood
  • Use Electrical
  • Color Available in Many Colors
  • Feature Durable
  • Finishing Polished

Quizmaster Board is designed to be used in quiz shows. Quizmaster determines who is first to press an answer button, is a problem since more than one person may appear to have pressed the button at same instant of time. To differentiate between the minute time differences in between two persons pressing the buttons is almost impossible for human being.

 

Only electronic device can do it with accuracy and therefore our Quizmaster is very popular now days with growing competitions being arranged. The circuit given here helps to make students familiar with an interesting device and helps develop understanding and interest of electronics bedsides commercial utilization.

About the circuit :
As shown in the diagram, the circuit is designed around ICs 4012 (NAND GATES) and 4013 (D Flip flop).

The IC 4012 which has two dual FF with SET and CLEAR inputs; is used to  set/ reset FFs. When the competitor presses a button/push switch (say S1), the FF1 gets SET (Q = 1, Pin13) irrespective of D and clock inputs. However to avoid action by noise pulses, the D input and Clock input is connected to logic HI.

 

This action forces Q output to go HI and Q- (pin12) to go LO. Hi at Q output will force LED D1 to glow through driver transistor T1. The Q- output is connected to inputs of all NAND gates

(N2, N3, N4) in the remaining FF circuits. The NAND gate outputs are in turn connected to CLEAR input of FF ( FF2, FF3, and FF4). This will produce LO state at all other FF outputs (Q) by virtue of being cleared.

The circuit is reset after a round is finished before the next round is to be started. The reset switch S5 shown here forces one input of all.

When next time another button is pressed, the corresponding FF gets SET and all other FFs gets reset thus glowing another corresponding LED.

Thus with press of a push switch, corresponding LED glows and all others get inhibited. The circuit also has a common buzzer, which gives audio alarm when any of the LED glows so as to attract attention of viewers and judges. The common buzzer is activated by another set of transistors driven from same output of FFs. All the buzzer signals are ORed through D5 – D8. The circuit can be easily extended to more number of competitors. For each additional competitor/participant an extra FF and a NAND gates is required to be connected. These NAND gates can be Red and the same result can be obtained. To avoid possibility of interference on account of long length of wires , the low impedance of RC network connected to SET input has to be kept low .If such problem is faced , value of R1 –R8 can be reduced to 1k.

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Clap Operated Staircase Light

  • Type Staircase Light
  • Shape Rectangular, Square
  • Certification CE Certified
  • Application Stairs
  • Color Metallic
  • Voltage 110V
  • Power 100Wt
  • Power Source Electric
  • Feature Blinking Diming
  • Warranty 1year

The Clap Operated Staircase Light is a useful device for staircase light, which can be turned ‘ON’ by clap & ‘Off’ as per delay setting. The Clap Operated Staircase Light is a solution for common habit of switching the light on and forgetting the same. Stairways, corridors or small indoor passages often tend to be dark throughout the day irrespective of the outdoor ambient light conditions. Therefore keeping such passages illuminated all the time becomes imperative, however this leads to unnecessary wastage of electricity.

This 9-12V battery-operated circuit triggers an Lights on when a sound is detected. It can also be used staircase light delay ON time setup as per your choice, which is as per person taking time to up or down period to complete staircase distance. The circuit has an ordinary condenser microphone MIC1 as a sound sensor. Sensitivity of this microphone can be changed to some extent by changing the value of the bias resistor R1. When the circuit is powered by a 9-12V battery supply to the circuit, transistor T1 acts as pre amplifier and T2 is again amplification the week signal of the mic and condenser C3 charge /discharge pulse fed to the IC1 of pin 2. This IC1 is in monostable mode the time starts up to the capacitor C5 will be discharge, and output pin 3 of IC 1 get firing the transistor T3 conduct, hence relay will be 'ON' and start the light / Bulb through relay in the series of the mains 220v will be 'ON'. The time period can be adjust by setting to VR2 Preset. VR1& R9 use for pull-up resistance for adjusting the avoid chattering the pin 2 of IC1.

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Bcd to 7 Segment Display Circuit

  • Type Circuit
  • Material Acrylic, Plastic
  • Shape Rectangle, Square
  • Application Electronic
  • Color Available in Many Colors
  • Feature Durable

We are offering Bcd to 7 Segment Display Circuit. Introduction : We see alphabets and numbers on many electronic machines in the market and public places. Seven segment display is now a days so popular that no electronic indicator can do without it .Ever gadget designer should learn about it. To display any number in English we require seven segment display. The drivers for driving these displays are abundantly available. As well as decoders from binary to seven segment code are also available. With the help of these decoders and drivers we can incorporate these display in any system where numbers are to be displayed. About the circuit : The IC 7447 is a decoder driver for seven-segment display, common anode CA type. It converts BCD code to seven-segment code and drives each segment of LED in seven segments LED display. Only current limiting resistances are required to be used in each segment. The seven segment displays fall in two categories of the CA (common anode) and CC (common cathode). 7- segment LEDs also have 8th segment, called decimal point. Thus it has 8 LEDs inside one body and have normally 10 pins . Two pins are allotted for common and 8 for segments (a to f and dp). CA has all anodes connected together, brought out as common pin and cathodes are available individually at terminal pins. Similarly in CC, all cathodes are connected together, brought out as common pin and anodes are available individually. When we need to glow a particular segment , we must pull it down by driving the individual pin low. Exactly same thing happens when we feed BCD code at input of 7447. It converts BCD code to seven segments as shown here in the table. The circuit here outputs the desired outputs i.e. Hi at those terminals which are required to glow as per the BCD input given to it. Besides these functions, the decoderdriver IC has additional function pins like LT, RBI and BIBRO LT (pin 3) when pulled Low shall lit all segments. This is provided to check all display segments for their functionality. RBI (pin 5) when low blanks the display only when input is BCD zero. BIBRO (pin 4) when pulled low shall put off all segments irrespective of input logic levels. This is useful when leading zero blanking is to be used to save power or control intensity. Since it is not totem pole output and has only a resistive pull up, it acts as input and output both. When used as input it can be forced low because of resistive pull up provided internally. To achieve leading zero blanking of displays in a multi digit display, RBI pin of a most significant decoder is connected to ground, and its BIRBO pin (which becomes low)is connected to next lower order decoder and thus cascading all will achieve leading zero blanking. For better understanding and grasp of the decoder and display function, the PCB is provided with facility to connect miniature toggle switches for applying individual logic signal (H & L) to all BCD inputs. This facility can be useful to practice for beginners. IC2 ( 7805) is a 5- v regulator provided to supply power to the IC 7447 and to display. Rectified DC filtered Input to this circuit can be between 8.5 to 12 volts. The decimal to BCD table and truth table for decoder are provided with literature.

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Cooler Timer Circuit

  • Type Circuit
  • Shape Rectangular
  • Feature Durable
  • Finishing Polished
  • Warranty 6 Months
  • Quality Good

During summer seasons, we all us knows the need of coolers. If cooler is on for long time, then the requirement of water is also very large. To minimize this problem to a large extent cooler timer is designed. Cooler Timer Circuit  controls the ON and OFF time of cooler water pump according to the user’s requirement. The minimum and maximum time setting is fraction of second and one-and-a-half minute respectively. Our valued clients can avail Cooler Timer  in different specifications.

About the Circuit :
Cooler Timer is designed using popular timer IC named as IC1. The circuit facilitates time adjustment of both charged and discharged states of the relay. IC1 is used is a stable mode. When power is ON, capacitor C3 starts charging via R1/VR2/R2 and on time of pump starts. When its voltage reaches to 2/3Vcc, it starts discharging via R2/VR1/R1. Now, OFF time of pump starts and when its voltage reaches to a value less than 1/3Vcc, it starts charging again and procedure repeats again. At the output of IC1 at pin3, on and off pulses are obtained. During on time transistor T1 turns ON, relay connected at the collector terminal energizes, and in turns pump becomes on. During off pulse, T1 turns off and relay becomes off which in turn makes pump off.

Separate delays for charged and discharged states of the relay are achieved by using two diodes (D1 and D2) and two preset VR1 and VR2 between pins 2 and 7 of the IC1. The preset VR1 and VR2 provide control over the ‘on’ and ‘off’ stages of the relay, respectively.

Features :

  • The circuit turns on and off with setting of ‘on’ time delay and ‘off’ time delay.
  • Diodes D4 and D5 are used for rectification and capacitor C1 is used for filtration.
  • Timer with ON time and OFF time setting for cooler/pump
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Touch Sensitive Musical Bell Circuit

  • Type Circuit
  • Material Brass
  • Color Black, Blue, Golden, White
  • Voltage 110V
  • Appearance Mordern
  • Finishing Polished
  • Driven Type Electric
  • Warranty 1 Year

Touch Sensitive Musical Bell Circuit gives a different melody sound for every touch. This Touch Sensitive Musical Bell generates different musical tones every time the plate is touched. If the plate is touched for more than two seconds, it gives a sound (beep-beep) different from the musical tone. Musical tune is produced after removal of the hand touching the plate. Only a few additional components are required to achieve excellent results.

About the Circuit :
The heart of the circuit is a musical tone generator IC APM993D (IC1). This is a programmed 1024 note ROM memory IC, which has inbuilt oscillator and tone generator. Touch plate is connected to base of transistor T1. When the plate is touched, T1 conducts and IC1gets triggered. Hence, it generates a musical tone. The output at pin 14 of IC is driven by transistors T2  in turn drives 8W Loudspeaker. Care should be taken that battery supply should not be greater than 3V.

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Multi-Tone Siren Circuit

  • Type Circuit
  • Use in Multi-Tone Siren
  • Material Metal
  • Feature Eco Friendly
  • Finishing Polished
  • Warranty 6 Months

This Multi-Tone Siren Circuit enables the users to select Police, Ambulance, and Fire & Staccato siren with 8W amp O/P. The siren kits available in the market generate normally a single tone. With Multi-Tone Siren, one can generate different types of siren tones for different purposes like ambulance, police fire, etc. This unique feature of the circuit makes it versatile and useful in wide range of applications like burglar system, lift door open alarm, smoke detector and any other alerting application.

About the circuit :
Versatile UM 3561, 8 pin IC is used here to generate four different audible ones. Basically IC has built in oscillator, control circuit, address counter, ROM and Tone generator etc .The predefined programs generate different tones only with few external components. The IC operates at low voltage of 3 volts upwards. Its quiescent current is as low as 150 microamperes.

A single resistor between pin7 and pin 8 decides the frequency of oscillations. Pin 1 and 6 are tone selector pins. The center - off toggle switch S1 helps in selecting the tone desired in the output. Output is available on pin 3.The selection table gives the switch poison and tone selected. The power supply used is from eliminator or battery measuring about 3-9 volts. A zener D1 of 2.7 volts is used to regulate the supply forIC1. R2 is the biasing resistor for zener D1.

 

The AF section consists of IC2, which is low power audio amplifier IC specially designed to deliver 1 – 8 watts of power at 4 ohms load (Speaker).The output of this amplifier exhibits low distortion and low noise. The input to this amplifier is fed through pin 3 through variable resistance VR1 to adjust the input signal. This acts as volume control. The output of this amplifier (pin 7) is fed to the speaker.

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Welcome LED Display Board Circuit

  • Type Circuit
  • Material Acrylic, Plastic
  • Shape Rectangular
  • Thickness 10-15mm, 15-20mm, 20-25mm
  • Color Available in Many Colors
  • Voltage 110V
  • Power Source Electric

We offer Welcome LED Display Board Circuit  that is designed using 5/3mm LEDs which, flashes each character one after another. Hobbyists can use this simple, low cost and effective ‘WELCOME’ Display Board at many places for decoration purpose. One can also change the alphabets by arranging the number of LEDs as shown in the circuit diagram. In speller displays each letter of the sign glows one after another until all are “ON”. After a few seconds, they will go out one by one and repeat thereafter.

About the Circuit :
The circuit is built around shift register IC3, which has eight outputs. Every eight speller are driven by eight outputs. IC3 consists of two identical 4-stage serial-input/parallel output registers. Each register has independent CLOCK and RESET input as well as a single serial DATA input. The logic level present at the DATA input at pin7 of IC3 is transferred into the first register stage and shifted by one stage at each positive going clock transition. Resetting of all stages is accomplished by a high level on the reset line. The clock circuit is designed around IC1, which provides clock input to IC3 at pin1 and pin9. The duration of the clock pulse is determined by timing components R1-R2/P1-C1. Adjusting preset P1 can change this frequency, which in turn change the speed of spelling output. At every clock transition, output of IC3 goes on shifting. IC2 is designed to provide data input to IC3. For correct logic data input, preset P2 is adjusted. Output of IC3 drives transistor T1 to T8 to light the letter composed of from LEDs on display board. Diodes D1, D2 and capacitor C7 is used for DC rectifier circuit. You can fabricate desired letters/alphabets out of LEDs by adjusting suitable PCB.

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Three Tune Musical Bell Circuit

  • Type Circuit
  • Material Brass, Plastic
  • Color Available in Many Colors
  • Voltage 110V
  • Appearance Mordern
  • Finishing Polished
  • Driven Type Electric
  • Warranty 1 Year

Three Tune Musical Bell Circuit is a simple and low cost melody project. The UM 66T series are CMOS LS is designed for use in doorbell, telephone and toy applications. The Three Tune Musical Bell is a chip ROM programmed for musical performance produced by CMOS technology. It results in very low power consumption, since the UM 66T series include oscillating and mode selection circuit, a compact melody module can be constructed with only a few additional components.


About the circuit :
The circuit uses UM 66T having 64 note ROM memory, which is capable to store three different tunes. The supply is given to IC through a switch S1. When the switch S1 is pressed, it will on the IC. The output of IC is in terms of sound. But, this signal is not enough to drive the speaker, so transistor T1 is used for amplifying the signal and to drive the speaker. Capacitor C1 is used as a filter capacitor. The power consumption of circuit is very low. It will work on supply of 3 volt.

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Polytechnic Kits

What is embedded system?
An Embedded System is a combination of computer hardware and software, and perhaps additional mechanical or other parts, designed to perform a specific function. An embedded system is a microcontroller-based, software driven, reliable, real-time control system, autonomous, or human or network interactive, operating on diverse physical variables and in diverse environments and sold into a competitive and cost conscious market.

An embedded system is not a computer system that is used primarily for processing, not a software system on PC or UNIX, not a traditional business or scientific application. High-end embedded & lower end embedded systems. High-end embedded system - Generally 32, 64 Bit Controllers used with OS. Examples Personal Digital Assistant and Mobile phones etc .Lower end embedded systems - Generally 8, 16 Bit Controllers used with an minimal operating systems and hardware layout designed for the specific purpose.
SYSTEM DESIGN CALLS:

EMBEDDED SYSTEM DESIGN CYCLE

Characteristics of Embedded System
• An embedded system is any computer system hidden inside a product other than a computer.
• They will encounter a number of difficulties when writing embedded system software in addition to those we encounter when we write applications
– Throughput – Our system may need to handle a lot of data in a short period of time.
– Response–Our system may need to react to events quickly
– Testability–Setting up equipment to test embedded software can be difficult
– Debugability–Without a screen or a keyboard, finding out what the software is doing wrong (other than not working) is a troublesome problem
– Reliability – embedded systems must be able to handle any situation without human intervention.
– Memory space – Memory is limited on embedded systems, and you must make the softwar
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Novel Light Effect Circuit

  • Type Circuit
  • Shape Rectangular
  • Feature Durable
  • Finishing Polished
  • Warranty 6 Months
  • Quality Good

Novel Light Effect Circuit is a simple, low cost novel light effect circuit which can be used for many purposes like decoration, display board etc. Novel Light Effect uses total 88 LEDs and a bunch of 11 LEDs will illuminate at a time. After a few seconds another bunch illuminates and the cycle repeats.

About the Circuit :
The circuit is built around shift register IC3 as shown in the circuit diagram. It has eight outputs. The output goes on shifting at every clock pulse at pin1 and pin9. Each register has independent CLOCK and RESET input as well as a single serial DATA input. The logic level present at the DATA input is transferred into the first register stage and shifted by one stage at each positive going clock transition. Resetting of all stages is accomplished by a high level on the reset line at pin14 and pin6. The clock circuit is designed using s stable multi vibrator IC1. The frequency of clock pulse is determined by timing components R1-R2/P1-C1. The frequency of oscillation can be changed by adjusting preset P1. Data input at pin7 of IC3 is provided by IC2, which is also a stable multi vibrator. Preset P2 is adjusted for correct logic data input. Each eight-output drives transistor T1 to T8 respectively. And, each transistor drives 11 LEDs connected at the collector terminal. At first clock pulse, output at pin5 of IC3 becomes high and T1 turns on, which drives 11LEDs. At second clock pulse, pin4 of IC3 goes high and T2 turns on. In this way, output goes on shifting at every clock pulse.  

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LED Wheel Effect Circuit

  • Type Circuit
  • Shape Rectangular
  • Feature Durable
  • Finishing Polished
  • Warranty 6 Months
  • Quality Good

LED Wheel Effect Circuit is the light that produces wheel effect due to the flashing of LEDs. Electronics hobbyists are always trying to design such circuits, which gives flashing effect and looks decorative. It is not a critical job now. The use of few ICs makes it possible to give such an effect. In its simplest form, the circuit needs an oscillator for the flash timing, a divider and the LED driver. The 33 number of LEDs are arranged in such a way that produces circle effect. The frequency of flashing can be varied by preset VR1.

About the Circuit :
The circuit is built around two ICs as shown in the circuit diagram. IC1 is used as an oscillator. When power is on, IC1 starts oscillating. The frequency of oscillation is determined by timing components designed around R1/R2-VR1/C1, which can be preset to individual requirements by setting preset VR1. Firstly, capacitor C1 starts charging. This is taken as on time and when its voltage reaches to 2/3Vcc, its starts discharging. Now off time starts. When capacitor discharges to a voltage less than 1/3Vcc, it stars charging again. This process repeats and charging and discharging of capacitor produces square pulses at the output pin3 of IC1. These pulses are given to counter IC2. It has total ten outputs. But in this project only first four outputs are used. At fifth output, IC2 gets reset and process repeats again. At every clock input at pin14, output at pin3, 2, 4 and 7 of IC2 goes high one by one. Accordingly, transistor T1, T2, T3, T4 becomes on one by one, which are used as a driver. At first clock pulse, pin3 becomes high, transistor T1 turns on and 8 LEDs connected at its collector terminal through R7 glows. At second clock pulse, transistor T2 becomes on and 8 LEDs connected at the collector terminal of T2 through resistor R8 becomes on. At third clock pulse, transistor T3 turns on and 8 LEDs connected at the collector terminal of T2 through resistor R9 glows. At fourth clock pulse, T4 becomes on and 8 LEDs connected at its collector terminal glows. At fifth clock pulse, IC2 gets reset and above procedure repeats again. The circuit requires DC power supply of 12V, which is designed using rectifier diodes D1 and D2 and capacitor C4 to filter the rectified signal.

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RS232 To TTL Convertor

  • Operating voltage 5v
  • Color Green
  • Shape Rectangular
  • Feature Eco Friendly
  • Finishing Polished
  • Packaging Type Packed in Boxes

RS232 To TTL Convertor for communicating between computer serial interface and microcontrollers. RS232 To TTL Convertor is based on advanced technology, which guarantees efficient performance. We are a Manufacturer and Supplier of RS232 To TTL Convertor, operating from India.


Specifications :

  • Max232 IC for Rs232 serial to TTL converter
  • On board data transmitter / receiver indicator LEDs
  • Easy to use FRC interface
  • Support all standard baud rates
  • Compact design


Package Content :

  • RS232 To TTL Convertor
  • FRC Cable
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Corepro Breakout Board

  • Color Green
  • Microcontroller 89V51RD2
  • Operating voltage 5v
  • Input Voltage 7v - 12v
  • Shape Rectangular
  • Warranty 6 Months

CoRePro Breakout Board is a full-featured development board for the NXP's P89V51RD2 microcontroller, which is most popular in industry. CoRePro is cost effective 40 pin, features rich microcontroller that offer real value to developer in terms of capabilities and features. CoRePro has 64KB of flash memory and 1024 bytes on chip SRAM. CoRePro is an ideal platform to build and execute numerous projects on P89V51RD2 microcontroller. All the pins of the controller are user accessible for performing their own customize project.

Detail :

  • On board voltage regulator and circuit protection
  • Power-ON and Reset switches
  • On board FRC header for easy programming
  • Multiple Vcc and GND lines for powering external circuits and interfacing sensors
  • 64 Kbytes Flash program memory


Package Content :

  • CorePro development board
  • P89V51RD2 microcontroller (mounted onboard)
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Hydroelectric Turbine Generator Model

Most machines that make electricity need some form of mechanical energy to get things started. Mechanical energy spins the generator to make the electricity. In the case of hydroelectricity, the mechanical energy comes from large volumes of falling water. For more than 100 years, the simplest way to produce the volumes of falling water needed to make electricity has been to build a dam. A dam stops the natural fl ow of a river, building up a deep reservoir behind it. However, large dams and reservoirs are not always appropriate, especially in the more ecologically sensitive areas of the planet. For making small amounts of electricity without building a dam, the small-scale hydroelectric generator is often the best solution, especially where fast-fl owing streams on steep slopes are close by. A small-scale hydro system usually consists of an enclosed water wheel or turbine, which is made to spin by jets of high velocity water. The water is taken from the stream and moved down slope to the turbine through a long pipe called a pen-stock. Water fl owing through the pen-stock picks up speed, and is directed at the blades of the turbine by nozzles. The turbine spins continuously, as long as there is water to drive it. The turbine is connected to an electrical generator, and the electricity is then available for running appliances or charging batteries. The spent water is returned to the stream. This kind of system is called a âmicro-hydroâ system, ârun-of-stream hydroâ or âlow-impact hydro.â
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L293D Motor Driver

  • Type Microstepping Motor Driver
  • Certification CE Certified
  • Color Green
  • Power 100Watt
  • Warranty 1 Year
  • Driven Eelectric
  • Operating Voltage 7 V to 12V DC

We bring forth L293D Motor Driver for driving DC motors and is ideal for robotics applications. L293D Motor Driver is a medium power motor driver perfect for driving DC motors and Stepper motors. L293D Motor Driver uses the popular L293D H-bridge motor driver IC. It can drive 4 DC motors in one direction, or drive 2 DC motors in both the directions with speed control. The driver greatly simplifies and increases the ease with which you may control motors, relays, etc. from microcontrollers. L293D Motor Driver can drive motors up to 12 V with a total DC current of up to 600mA

Detail :

  • 4 channel output(can drive 2 DC motors bidirectional)
  • 600mA output current capability per channel
  • PTR connectors for easy connections
  • User accessible enable pins facility


Package Content : L293D motor driver board

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Two Digit Up Down Counter Circuit

  • Type Circuit
  • Shape Rectangular
  • Feature Durable
  • Finishing Polished
  • Warranty 6 Months
  • Quality Good

We are offering Two Digit Up Down Counter Circuit enables users to count from 0 to 99 in up as well as down mode at any instant of counting. two digit updown counter is suitable for many applications such as clock generator, frequency meters etc. The circuit uses updown counter ic1 & ic2 and bcd to seven-segment decoder ic3 & ic4. The clock circuit and updown switching is neither designed using four nor gate ic5. Two 7-segment displays in common cathode configuration are used to display the count.

About the circuit :

When power is switched on, the clock pulses generated by rc network build around two nor gates in ic5 is fed to the clock input pin1 of ic1 & ic2. As a result counting starts in up or down mode depending on the logic present at updown mode pin10. If pin10 is at high level, counter starts up counting and starts down counting when it is at low level. This logic is set with two nor gates in ic5 and toggle switch s1. When s1 is in up position, pin 10 goes logic high and when s1 is in down position, it gives logic low. Reset switch s2 is used to reset the counter. In this case, displays show 00 in two 7- segment displays and counting starts again.

At every clock pulse, count increases by one in up mode and decreases by one in down mode. The clock-in terminal (pin5) of ic1 is connected to clock-out terminal (pin7) of ic2. Thus when ic1 completes counting from 0 to 9 in up mode or 9 to 0 in down mode ic2 starts counting. The display can be shown on two 7- segment displays named as dis1 and dis2.

The speed of counting can be set with the aid of pot p1. The number of digits the counter provides can be extended by adding more counterdecoderdisplay stages.

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Obstacle Avoider Robot

  • Type Avoider Robot
  • Color Available in Many Colors
  • Finishing Polished
  • Material Metal
  • Use Industrial
  • Feature Eco Friendly

An Obstacle Avoiding Robot is an intelligent device, which can automatically sense and overcome obstacles on its path. It’s the most basic example of adding small intelligence to a robot, but it’s actually the designer’s intelligence! After reading this documentation and going through the assembly video from our website, you will be playing with the one shown above. Moreover you can make an Obstacle Avoiding Robot modular so that it can be easily modified in future. The main electronics and mechanical components that will be used in making an Obstacle Avoiding Robot are two sensors made using TSOP and IR LEDs, an ATmega8 based microcontroller board including motor driver circuitry, acrylic chassis set, two BO motors and wheels and battery holder.

Features :

  • Compact size and easy to assemble
  • Range adjustable sneers.
  • ATmega8 micro controller board within built motor driving circuitry.
  • Onboard programming port which can be used for modification and up gradation.
  • Obstacle Avoider Robot Quick Start Guide : The Obstacle Avoider kit includes everything you need to make a Obstacle Avoider Robot

    Requirement :
    The micro controller board is pre programmed as Obstacle Avoider so you will only need a power supply and screw driver set to build up the robot. We have provided a programming port so that if you wish to upgrade the algorithm or the application you can do that and for that you will just need a USB programmer.
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Line Follower Robot

  • Type Robot
  • Color Available in Many Colors
  • Finishing Polished
  • Material Metal
  • Use Industrial
  • Feature Eco Friendly

line follower robots are a popular beginner’s choice. It’s the most basic example of adding small intelligence to a robot, but it’s actually the designer’s intelligence! after reading this documentation and going through the assembly video from our website, you will be playing with the one shown above. Moreover you can make line follower robot modular so that it can be easily modified in future.   the main electronics and mechanical components that will be used in making this line follower robot are two sensors made using ir leds, a atmega8 based microcontroller board including motor driver circuitry, acrylic chassis set, two bo motors and wheels and battery holder.

features :

  • compact size and easy to assemble
  • range adjustable sensors
  • atmega8 micro controller board within built motor driving circuitry
  • onboard programming port which can be used for modification and up gradation.
  • line follower robot quick start guide : the line following kit includes everything you need to make a line following robot.

    requirement :
    the micro controller board is pre programmed as line follower so you will only need a power supply and screw driver set to build up the robot. We have provided a programming port so that if you wish to upgrade the algorithm or the application you can do that and for that you will just need a usb programmer.
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SerPro ISP programmer

  • Type Programmer
  • Use Computer
  • Color Green
  • Feature Durable
  • Warranty 6 Months
  • Packaging Type Packed in Boxes

Our valued customers can avail from us SerPro ISP programmer. SerPro is a serial ISP programmer plus RS232 to TTL converter for AVR microcontrollers. SerPro has compact design and easy to install. Our esteemed customers can avail SerPro in different specifications. Further, customization solutions are also available on demand.

Specifications :

  • Max232 IC for Rs232 serial to TTL converter
  • Operating voltage : 5v
  • On board data transmitter/receiver indicator LEDs
  • On board switch for ISP / UART selection
  • Easy to use FRC interface
  • Compact design


Package Content :

  • SerPro (Serial ISP Programmer)
  • FRC Cable
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AVPro Breakout Board

  • Type Board
  • Material Metal
  • Feature Durable
  • Finishing Polished
  • Warranty 6 Months
  • Packaging Type Packed in Boxes

Being committed to quality and innovation, we have established a strong foothold as a Manufacturer and Supplier of AVPro. AVPro is an ideal platform to build and execute numerous projects on ATmega16 microcontroller. All the pins of the controller are user accessible for performing your own customize projects.

Detail

  • On board voltage regulator and circuit protection
  • Multiple Vcc and GND lines for powering external circuits and interfacing sensors
  • Comes with an ATmega16 with preset fuse bits
  • On board FRC header for easy programming
  • On board potentiometer for testing ADC
  • Power-ON and Reset switches
  • 16 Kbytes Flash program memory
  • 512 bytes EEPROM  


Package Content :

  • AVPRO breakout board
  • ATmega16 microcontroller with preset fuse bits
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Upro ISP programmer

  • Operating Voltage 4.5V to 5V DC
  • Color Green
  • Feature Durable
  • Shape Rectangular
  • Warranty 6 Months

We are a prominent Manufacture and Supplier of Upro ISP programmer. Upro integrates advanced technology to offer reliable performance. Upro is available in different specifications, catering diverse demands of the clients. Upro is available at economical price.

Detail :

  • Onboard data transmitter/receiver indicator LEDs
  • Compaq design
  • Easy to use FRC interface
  • Supports all microcontroller families
  • Support all standard baud rates
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Light Dimmer Circuit

  • Size 3 Inch, 3.5 Inch
  • Type Circuit
  • Material Brass, Polycarbonate, PVC
  • Certification ISI Certified
  • Color Available in Many Colors
  • Max. Current 110 V DC
  • Mechanical Life 1-3 Years

Many times, it is required to control the power of incandescent lamps. This simple triac Light Dimmer Circuit  circuit of Light Dimmer can control power up to 1000W. The circuit operates on the phase-control principle. The power-operated devices like diac and triac are used for controlling the output power.

About the Circuit :
The circuit of Light Dimmer is shown in figure. The main control is provided by P2. This determines the rate at which C2 charges and hence the point along the mains waveform at which the voltage on C2 reaches the breakdown voltage of the diac, which is when the triac is triggered. P1, in conjunction with R1 and C1, determines the minimum brightness level, or alternatively may be used as a fine brightness control. Interference suppression is provided by R2 and C3.

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Ultrasonic Deterrent Circuit

  • Type Circuit
  • Material Metal
  • Use Industrial
  • Feature Eco Friendly
  • Finishing Polished
  • Warranty 6 Months

Ultrasonic Deterrent Circuit is used as a mosquito repellent and also to run away nasty rodents. The present unit may be most efficient for the people who are worried about the nasty rodents to their homes. This is because the unit emits a fairly high note from a loudspeaker to frighten the nasty rodents. Unfortunately we cannot vouch for the effectiveness of the circuit. We would however, advice you to change the frequency from time to time to prevent the little animals getting used to the sound.

 In addition, the same unit can be used as a mosquito repellent, because especially mosquitoes are sensitive to ultrasonic frequency. By adjusting preset at ultrasonic frequency they are unable to withstand them and tend to be repelled by them. Thus people are protected from harmful chemicals which are available in market for mosquito repellent.

About the Circuit :

  • In the circuit diagram, IC1 is arranged to operate as a relaxation oscillator whose frequency may be set between 5 KHz and 30 KHz with preset P1. Output Q (at pin10) and ‘Q (at pin11) is applied to IC2 and IC3, which are non inverting drivers. The six stages contained in these IC’s are connected in parallel to enable direct driving of T1/T2 and T3/T4 respectively. Either T1/T4 or T2/T3 conducts simultaneously. These transistor pairs are capable of driving a tweeter.
  • The circuit requires a DC power supply 12V. If the intensity of sound is to be increased, then decrease the value of collector resistors R3, R4, R5 and R6. The wattage required for these resistors is 1W.
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Ultrasonic Radar

  • Type Radar
  • Material Metal
  • Color Available in Many Colors
  • Application For Liquid Measuring
  • Frequency 0-25Ghz, 25-50Ghz
  • Beam Angle 0-180 Deg, 180-360 Deg
  • Process Pressure 0-0.5Mpa.0.5-1Mpa

Ultrasonic Radar is used as an obstacle detector using ultrasonic frequency.  This project brings you the latest application in the field of security systems. Also it can be used as a burglar alarm for homes etc. It consists of a set of ultrasonic transmitter and receiver transducers, which operate at the same frequency. When any object moves in the area covered by the circuit, the circuit’s fine balance is disturbed and the alarm is raised.

 

The circuit is very sensitive and can be adjusted to reset itself automatically or to stay triggered till it is reset manually after an alarm.

About the Circuit :

  • The circuit of Ultrasonic Radar is shown in figure. Transmitter and Receiver use ultrasonic piezoelectric transducers as output and input devices respectively and their frequency of operation is determined by the particular devices in use.
  • The transmitter is build around two NAND gates of the four found in IC3 which are used here wired as inverters and in the particular circuit they form a multivibrator the output of which drives the transducer. The trimmer P2 adjusts the output frequency of the transmitter and for greater efficiency it should be made same as the frequency of resonance of the transducers in use.
  • The receiver similarly uses a transducer to receive the signals that are reflected back to it the output of which is amplified by the transistor T3, and IC1,  which is 741 op-amp. The output of IC1 is taken to the non inverting input of IC2, the amplification factor of which is adjusted by means of P1. The circuit is adjusted in such a way as to stay in balance as long as the same as the output frequency of the transmitter. If there is some movement in the area covered by the ultrasonic emission, the signal that is reflected back to the receiver becomes distorted and the circuit is thrown out of balance. The output of IC2 changes abruptly and the Schmitt Trigger circuit which is build around the remaining two gates in IC3 is triggered. This drives the output transistor T1, T2, which in turn gives a signal to the alarm system. The circuit works from 9-12V DC and can be used with batteries or a power supply.


Calibration :
Trimmer P1 is set at its middle position. Turn then P2 slowly tills the LED lights when you move your fingers slightly in front of the transducers. Adjust then P1 for maximum sensitivity. Connecting together pins 7 & 8 will make the circuit to stay triggered till it manually reset after an alarm. This can be very useful if you want to know that there was an attempt to enter in the place, which are protected by the radar.

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Touch Dimmer Circuit

  • Type Circuit
  • Shape Rectangular
  • Feature Durable
  • Finishing Polished
  • Warranty 6 Months
  • Quality Good

By simply touching Touch Dimmer Circuit, the light intensity of incandescent lamps can be increased. Touch Dimmer is built around 8-pin CMOS IC TT6061. Touch Dimmer is specifically manufactured for touch dimmer applications. Initially, when mains switch is ‘on, ’ the bulb is ‘off’. Now, if touch plate is touched, the bulb illuminates dimly. On second touch, the bulb gives medium light. At the third touch, the bulb is driven fully. Another touch puts off the light. Since the IC is highly sensitive, use a long wire to connect the IC to the touch sensor. The circuit uses minimum external components. For touch plate, a simple copper plate of 1cm×1cm or even the end of the lead wire can be used. Touch plate is coupled to the touch detector through 820pF, 2kV capacitors C1, C2, and C3 connected in series. Internally IC TT6061A’s touch signal is connected to the counter/decoder via a resistor and clock input CK is connected to the counter/decoder via a frequency generator. Line frequency signal is taken through R4 at pin 2 of IC TT6061A. At zero crossing, the triac (BT136) triggers to drive a 200W bulb. The 6.8V power supply is taken directly from mains through resistors R1 and R3, diode D3, capacitor C4, and zener diode and fed to power-input pin 3 of the IC. Capacitors C1, C2, and C3 connected between touch input pin 4 and touch plate remove the shock potential from the touch plate, so do not replace these capacitors with a single capacitor or with a capacitor of a lower voltage rating. Mains potential exists in the circuit. It is dangerous to touch the circuit when mains is ‘on.’ Simply touching this touch dimmer you can increase the light intensity of incandescent lamps in four steps.

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  • Keshav Imperial,Shop Nop B-101,B Wing First Floor,Nagpur, Shani Mandir, Near Shani Mandir, Sitabuldi, Nagpur-440012, Maharashtra, India, Shankar Nagar, Nagpur, Maharashtra - 440012, India