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20W Audio Amplifier is a 20W Hi-Fi mono amplifier using amplifier IC available at Rs 240/-. The IC TBA810 (IC1) which is an audio amplifier IC has been in production for several years. It has built in thermal and short circuit protection circuits, so it should have a reasonable life.
The main functions of IC are
Without any additional cooling, the IC can deliver 1W into a 4W Loudspeaker with a 6V supply. With a sufficiently large cooling fin and a 16V supply it can deliver up to 20W into 4W. The input sensitivity in this case is 240mV. If 8W Loudspeaker are used, the maximum output power is about half.
The input impedance is practically determined by P1, so it is possible to connect a crystal cartridge direct to the input. If this high impedance is not required, the value of P1 can be reduced.
The frequency response is 3db from 40Hz to 18KHz. Note that the pin numbers in the circuit do not take account of the cooling fin; the IC has a total of 12 pins .The pin-out diagram is shown in figure.
The Bridge Rectifier is a simple rectifier circuit for AC to DC conversion. Full wave rectifier circuit produces an output voltage or current which is purely DC or has some specified DC component. Full wave rectifiers have some fundamental advantages over their half wave rectifier counterparts. The average (DC) output voltage is higher than for half wave, the output of the full wave rectifier has much less ripple than that of the half wave rectifier producing a smoother output waveform. Circuit that produces the same output waveform as the full wave rectifier circuit above, is that of the Full Wave Bridge Rectifier. This type of single phase rectifier uses four individual rectifying diodes connected in a closed loop "bridge" configuration to produce the desired output. The main advantage of this bridge circuit is that it does not require a special centre tapped transformer, thereby reducing its size and cost.
The single secondary winding is connected to one side of the diode bridge network and the load to the other side as shown below as per output voltage. The four diodes labeled D1 to D4 are arranged in "series pairs" with only two diodes conducting current during each half cycle. During the positive half cycle of the supply, diodes D1 and D2 conduct in series while diodes D3 and D4 are reverse biased and the current flows through the load as shown below. The full-wave bridge rectifier however, gives us a greater mean DC value with less superimposed ripple while the output waveform is twice that of the frequency of the input supply frequency.
We can therefore increase its average DC output level even higher by connecting a suitable smoothing capacitor C1 across the output of the bridge circuit as shown below. The LED is connected through R1 across output voltage.
Most power supplies use a step-down transformer to reduce the dangerously high mains voltage (230V) to a safer low voltage. Here we are use secondary voltage transformer like 0-6, 0-9, 0-12 etc. for low current.
20+20W Audio Amplifier (Stereo) is a 20W Hi-Fi stereo amplifier using low cost amplifier IC. The IC TBA810 (IC1) which is an audio amplifier IC has been in production for several years. It has built in thermal and short circuit protection circuits, so it should have a reasonable life. Two into 20Watt is a Stereo.
The main functions of IC are
Without any additional cooling, the IC can deliver 1W into a 4W Loudspeaker with a 6V supply. With a sufficiently large cooling fin and a 16V supply it can deliver up to 20W+20W into 4W. The input sensitivity in this case is 240mV. If 8W Loudspeaker are used, the maximum output power is about half.
The input impedance is practically determined by P1, so it is possible to connect a crystal cartridge direct to the input. If this high impedance is not required, the value of P1 can be reduced.
The frequency response is 3db from 40Hz to 18KHz. Note that the pin numbers in the circuit do not take account of the cooling fin; the IC has a total of 12 pins .
Dilip Bhoyar (Elektrokit)
Keshav Imperial,Shop Nop B-101,B Wing First Floor,Nagpur, , Shani Mandir, Near Shani Mandir, Sitabuldi, Nagpur-440012, Maharashtra, India, Shankar Nagar
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