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It is a small, metal-reinforced, oval hole found on almost all small or portable computers and electronics equipment.
Alaptop skinis a precision-cut vinyl adhesive material, usually with some design, photograph, or other image, designed for application to the outside of a laptop, usually on the back of the LCD screen.
Laptop skins are designed to be durable and to give laptops a unique, customized look while also protecting the laptop from scratches and other damage from wear and tear. Laptop skins can also be used for branding purposes, promoting a company name, product, or cause.
Laptop skins come in different materials and quality. The following are some desirable characteristics:
Various usb products are available, some are usb fan, usb sharer 2 ports, usb sharer 4 ports, usb to IDE/SATA with Adapter etc.
LAN CARD
With the increasing use of the computers and the networking the local area network of the LAN is one such network type which links the two computers in a connection.
For this connection a Local area network card or the LAN card is required which enables the connection of the computers in a network. It is a piece of hardware which is connected inside the PC linking the computer network.
The LAN Card is of both the common types which are the OSI layer 1 and 2, dealing with the physical as well as the data link layer respectively. It uses the correctly entered MAC addresses for the network to work. This then allows the computers to connect using cables or even wirelessly which then requires a special type of LAN card called the WLAN card.
With the increase in the development and technology, the local area network of the wireless type is now mostly preferred. Therefore a Wireless LAN Card is required for this purpose. The computers with the wireless LAN Card can transmit and receive data via radio waves using the special technology of SST or the Spread-Spectrum technology.
The wireless LANs are available in four basic types which include the 802.11, followed by type a, b and also g.
Brands like Intex, Zebronics are available.
Apower supplyis a device that supplies electric power to one or more electric loads. The term is most commonly applied to devices that convert one form of electrical energy to another, though it may also refer to devices that convert another form of energy (mechanical, chemical, solar) to electrical energy. A regulated power supply is one that controls the output voltage or current to a specific value; the controlled value is held nearly constant despite variations in either load current or the voltage supplied by the power supply's energy source.
Every power supply must obtain the energy it supplies to its load, as well as any energy it consumes while performing that task, from an energy source. Depending on its design, a power supply may obtain energy from:
Alaptop skinis a precision-cut vinyl adhesive material, usually with some design, photograph, or other image, designed for application to the outside of a laptop, usually on the back of the LCD screen.
Laptop skins are designed to be durable and to give laptops a unique, customized look while also protecting the laptop from scratches and other damage from wear and tear. Laptop skins can also be used for branding purposes, promoting a company name, product, or cause.
Laptop skins come in different materials and quality. The following are some desirable characteristics:
Cooler Pad
Alaptop/notebook cooler, cooler padorchill matis an accessory for laptop computers that helps reduce their operating temperature. Normally used when the laptop is unable to sufficiently cool itself. Laptop coolers are intended to protect both the laptop from overheating and the user from suffering heat related discomfort.
A cooling pad may house active or passive cooling methods and rests beneath the laptop. Active coolers move air or liquid to direct heat away from the laptop quickly, while passive methods may rely on thermally conductive materials or increasing passive airflow.
Various usb products are available, some are usb fan, usb sharer 2 ports, usb sharer 4 ports, usb to IDE/SATA with Adapter etc.
LAN CARD
With the increasing use of the computers and the networking the local area network of the LAN is one such network type which links the two computers in a connection.
For this connection a Local area network card or the LAN card is required which enables the connection of the computers in a network. It is a piece of hardware which is connected inside the PC linking the computer network.
The LAN Card is of both the common types which are the OSI layer 1 and 2, dealing with the physical as well as the data link layer respectively. It uses the correctly entered MAC addresses for the network to work. This then allows the computers to connect using cables or even wirelessly which then requires a special type of LAN card called the WLAN card.
With the increase in the development and technology, the local area network of the wireless type is now mostly preferred. Therefore a Wireless LAN Card is required for this purpose. The computers with the wireless LAN Card can transmit and receive data via radio waves using the special technology of SST or the Spread-Spectrum technology.
The wireless LANs are available in four basic types which include the 802.11, followed by type a, b and also g.
Any sort of LAN card you use will have some of the typical features of a network card which includes the twisted pair, the AUI socket and also the BNC. It is at the AUI socket that the network cable has to be connected. The LAN cards usually are designed to support the rate transfer to be ranging from 10 to 1000 megabits per second.
USB BLUETOOTH
A personal computer that does not have embedded Bluetooth can be used with a Bluetooth adapter that will enable the PC to communicate with other Bluetooth devices (such as mobile phones, mice and keyboards).
While some desktop computers and most recent laptops come with a built-in Bluetooth radio, others will require an external one in the form of a dongle.
Unlike its predecessor, IrDA, which requires a separate adapter for each device, Bluetooth allows multiple devices to communicate with a computer over a single adapter.
Bluetooth exists in many products, such as the iPod Touch, Lego Mindstorms NXT, PlayStation 3, PSP Go, telephones, the Nintendo Wii, and some high definition headsets, modems, and watches. The technology is useful when transferring information between two or more devices that are near each other in low-bandwidth situations.
Bluetooth is commonly used to transfer sound data with telephones (i.e., with a Bluetooth headset) or byte data with hand-held computers (transferring files).
Bluetooth protocols simplify the discovery and setup of services between devices. Bluetooth devices can advertise all of the services they provide. This makes using services easier because more of the security, network address and permission configuration can be automated than with many other network types.SOUND CARD
Asound card(also known as anaudio card) is an internal computer expansion card that facilitates the input and output of audio signals to and from a computer under control of computer programs. The termsound cardis also applied to external audio interfaces that use software to generate sound, as opposed to using hardware inside the PC.
Typical uses of sound cards include providing the audio component for multimedia applications such as music composition, editing video or audio, presentation, education and entertainment (games) and video projection.
Sound functionality can also be integrated onto the motherboard, using basically the same components as a plug-in card. The best plug-in cards, which use better and more expensive components, can achieve higher quality than integrated sound. The integrated sound system is often still referred to as a "sound card".
A laptop skin is a precision-cut vinyl adhesive material, usually with some design, photograph, or other image.
Various other products in Laptop accaessories are available:-
Alaptop skinis a precision-cut vinyl adhesive material, usually with some design, photograph, or other image, designed for application to the outside of a laptop, usually on the back of the LCD screen.
Laptop skins are designed to be durable and to give laptops a unique, customized look while also protecting the laptop from scratches and other damage from wear and tear. Laptop skins can also be used for branding purposes, promoting a company name, product, or cause.
Laptop skins come in different materials and quality. The following are some desirable characteristics:
Cooler Pad
Alaptop/notebook cooler, cooler padorchill matis an accessory for laptop computers that helps reduce their operating temperature. Normally used when the laptop is unable to sufficiently cool itself. Laptop coolers are intended to protect both the laptop from overheating and the user from suffering heat related discomfort.
A cooling pad may house active or passive cooling methods and rests beneath the laptop. Active coolers move air or liquid to direct heat away from the laptop quickly, while passive methods may rely on thermally conductive materials or increasing passive airflow.
We deals in various backpacks, laptop sleeves for mini 10", 14.1", 15.6". Branded Laptop bags also available in bulk quantity.
Laptop Bags
Laptop bags are very crucial accessory to safe guard the laptop, which happens to be very delicate and expensive device. They are not only used to carry the laptop from one place to another but do offer greater life by preventing from scratches and mishandling. They are available in variety of materials and patterns with great space inside to occupy other associated accessories.
The readily available in the market are Laptop bag HP/dell/lenova, laptop travel bag, HP deluxe bag pack, Laptop bag office portfolio file carry case, and many more.
Some types of Laptop bags are:-
Messenger BagsFunctional and distinct, our Messenger Bags are ideal lightweight solutions for everyday travels. Their cutting-edge designs are perfect for businesses, schools or weekend getaways.
BackpacksTargus carries a complete line of stylish backpacks that range in form factor, functionality and price. With models that accommodate notebooks with up to 17" screens, there is sure to be an ergonomic solution for any mobile user.
RollerIdeal for the business traveler or student - our Rolling Cases make it easy to transport your entire mobile computing environment.
ToploadTopload cases allow for easy access to notebook and other accessories, all in a lightweight design
SlimcaseUsed as the main laptop carrier or in conjunction with another case, Targus sleeves provide great protection to any laptop in a compact and lightweight form factor.
We provide compatible laptop batteries of 4400mAH and for mini laptop batteries for all regular models available in the market.
Compatible Laptop Batteries:-
Compatible Laptop Products:-
Compatible Mini Laptop Adapters for:-
External hard disk is a great solution for storing digital data in a secure and cost effective manner. Today we are living in the digital age, and all our photos, videos, documents and music are in digital formats. CDs and DVDs do not have enough space to store the backup of our PC or Laptop. With growing data, the storage capacity of our PC or laptop proves insufficient. We therefore need a solution which can let us store huge volumes of data without having to worry about the storage. This is whereexternal hard diskscome into the picture.
External hard disks can store terabytes of data and are very easy to use. You can simply connect your computer withexternal hard disk drivevia USB cable or FireWire with eSATA. USB 3.0 provides data transfer speeds of up to 5 Gbit/s. On the other hand, eSATA is faster than USB 3.0 and can provide up to 6 Gbit/s data transfer speed.
External hard disks in Indiaare available in several capacities, ranging between 128GB and 2TB. External HDD can also be used as boot-up devices to restore the OS on a PC in case of any malfunction or serious security issues.
You must be fascinated with huge capacity portable hard drives and might be thinking of buying an HDD that offers terabytes of space. But the truth is, most of us do not require such huge data storage. There is a basic rule you need to follow when you are buying anexternal HDD. You should at least buy anexternal hard diskof same capacity of the hard drive of your computer, so that you can freely backup all data of your computer.
But there are some things that you should look before choosing an external hard drive like the compatibility with your OS. So before buying, please check the OS compatibility of the hard drive.In addition, most hard drives come with Windows driver, thats why if your Windows fail for any reason, you wont be able to access your HD using DOS. In general, manufacturers of external had drive do not provide support for DOS.
Capacity, performance and mobility plays important role in buying external hard drives. In India, you will find external hard drives from brands like Samsung, Seagate, Western Digital, Transcend, Toshiba, Buffalo, HP, Sony, etc. Most of them are providing hard drive in different capacities. If you want to buy external hard disk, keep all of the above-mentioned facts in mind. Large 3.5-inch HDD can provide you large storage capacity, but these are hard to carry, on the other hand, small 1-inch HDD is portable but they have limited storage capacity. So considering the fact, we would suggest you to buyUSB external hard diskthat fits your requirement in term of storage, portability and budget.
Computer speakers, ormultimedia speakers, are speakers external to a computer, that disable the lower fidelity built-in speaker. They often have a low-power internal amplifier. The standard audio connection is a 3.5mm (approximately 1/8inch) stereo jack plug often color-coded lime green (following the PC 99 standard) for computer sound cards. A plug and socket for a two-wire (signal and ground) coaxial cable is widely used to connect analog audio and video components. Rows of RCA sockets are found on the backs of stereo amplifier and numerous A/V products. The prong is 1/8" thick by 5/16" long. A few use an RCA connector for input. There are also USB speakers which are powered from the 5 volts at 500 milliamps provided by the USB port, allowing about 2.5 watts of output power.
Computer speakers range widely in quality and in price. The computer speakers typically packaged with computer systems are small, plastic, and have mediocre sound quality. Some computer speakers have equalization features such as bass and treble controls.
The internal amplifiers require an external power source, usually an AC adapter. More sophisticated computer speakers can have a subwoofer unit, to enhance bass output, and these units usually include the power amplifiers both for the bass speaker, and the small satellite speakers.
Some computer displays have rather basic speakers built-in. Laptops come with integrated speakers. Restricted space available in laptops means these speakers usually produce low-quality sound.
For some users, a lead connecting computer sound output to an existing stereo system is practical. This normally yields much better results than small low-cost computer speakers. Computer speakers can also serve as an economy amplifier for MP3 player use for those who wish to not use headphones, although some models of computer speakers have headphone jacks of their own.
Desktop & Laptop speakers are available:-4050/4550/4800/5200/5600 Multimedia SpeakerUSB Speaker (Mini/TS-128/BF-2/F&T-2025
Computer speakers, ormultimedia speakers, are speakers external to a computer, that disable the lower fidelity built-in speaker. They often have a low-power internal amplifier. The standard audio connection is a 3.5mm (approximately 1/8inch) stereo jack plug often color-coded lime green (following the PC 99 standard) for computer sound cards. A plug and socket for a two-wire (signal and ground) coaxial cable is widely used to connect analog audio and video components. Rows of RCA sockets are found on the backs of stereo amplifier and numerous A/V products. The prong is 1/8" thick by 5/16" long. A few use an RCA connector for input. There are also USB speakers which are powered from the 5 volts at 500 milliamps provided by the USB port, allowing about 2.5 watts of output power.
Headphonesare a pair of small loudspeakers which are designed to be held in place close to a user's ears. Headphones have wires which allow them to be connected to a signal source such as an audio amplifier, radio, CD player, or portable media player. They are also known asstereophonesor, colloquially, cans. The in-ear versions are known asearphonesorearbuds. In the context of telecommunication, the term headset is used to describe a combination of headphone and microphone.
Types of Headphones:-
The particular needs of the listener determine the choice of headphone. The need for portability indicates smaller, lighter headphones but can mean a compromise in fidelity. Headphones used as part of a home hi-fi do not have the same design constraints and can be larger and heavier. Generally, headphone form factors can be divided into four separate categories:circumaural, supra-aural, earbud, andin-ear.
Circumaural headphones(sometimes calledfull size headphones) have circular or ellipsoid earpads that encompass the ears. Because these headphones completely surround the ear, circumaural headphones can be designed to fully seal against the head to attenuate any intrusive external noise. Because of their size, circumaural headphones can be heavy and there are some sets which weigh over 500 grams (1lb). Ergonomic headband and earpad design is required to reduce discomfort resulting from weight.
Supra-auralSupra-aural headphoneshave pads that sit on top of the ears, rather than around them. They were commonly bundled with personal stereos during the 1980s. This type of headphone generally tends to be smaller and lighter than circumaural headphones, resulting in less attenuation of outside noise.
Open or closed backCircumaural and supra-aural headphones can both also be further differentiated by the type of earcups:
Open-backheadphones have the back of the earcups open. This leaks more sound out of the headphone and also lets more ambient sounds into the headphone, but gives a more natural or speaker-like sound and more spacious "soundscape" - the perception of distance from the source.
Closed-back(or sealed) styles have the back of the earcups closed. Depending on the model they may block 8-32db of ambient noise, but have a smaller soundscape, giving the wearer a perception that the sound is coming from within their head., one reason for this is that there are sounds reflected back towards the ear.
Ear-fitting headphones EarbudsIn-ear headphones, like earbuds, are small and without headband, but are inserted in the ear canal itself. They are sometimes known as canalphones. Price and quality range from relatively inexpensive to very high; the better ones are called in-ear monitors (IEMs) and are used by audio engineers and musicians as well as audiophiles.
Canalphones offer portability similar to earbuds, block out much environmental noise by obstructing the ear canals, and are far less prone to falling out. When used for casual portable use they block out sounds which can be important for safety (e.g., approaching vehicles).
Telephone headsets connect to a fixed-line telephone system. A telephone headset functions by replacing the handset of a telephone. Headsets for standard corded telephones are fitted with a standard 4P4C commonly called an RJ-9 connector. Headsets are also available with 2.5mm jack sockets for many DECT phones and other applications. Cordless bluetooth headsets are available, and often used with mobile telephones. Headsets are widely used for telephone-intensive jobs, in particular by call centre workers. They are also used by anyone wishing to hold telephone conversations with both hands free.
For older models of telephones, the headset microphone impedance is different from that of the original handset, requiring a telephone amplifier for the telephone headset. A telephone amplifier provides basic pin-alignment similar to a telephone headset adaptor, but it also offers sound amplification for the microphone as well as the loudspeakers. Most models of telephone amplifiers offer volume control for loudspeaker as well as microphone, mute function and switching between headset and handset. Telephone amplifiers are powered by batteries or AC adaptors.
THINCLIENT
Athin client(sometimes also called aleanorslim client) is a computer or a computer program which depends heavily on some other computer (itsserver) to fulfill its traditional computational roles. This stands in contrast to the traditional fat client, a computer designed to take on these roles by itself. The exact roles assumed by the server may vary, from providing data persistence (for example, for diskless nodes) to actual information processing on the client's behalf.
Thin clients occur as components of a broader computer infrastructure, where many clients share their computations with the same server. As such, thin client infrastructures can be viewed as the providing of some computing service via several user-interfaces. This is desirable in contexts where individual fat clients have much more functionality or power than the infrastructure either requires or uses. This can be contrasted, for example, with grid computing.
Thin-client computing is also a way of easily maintaining computational services at a reduced total cost of ownership.[1]
The most common type of modern thin client is a low-end computer terminal which concentrates solely on providing a graphical user interface to the end-user. The remaining functionality, in particular the operating system, is provided by the server.
ADSL SPLITTER
ADSLSplitters and filters cause the most avoidable installation problems for ADSL users. A filter or splitter is essential wherever a telephone or other device shares a line with an ADSL modem. Filters and splitters eliminate the high frequency noise used by ADSL services from being heard on the phones. Splitters and filters perform the same function but in two ways. A splitter divides the signal into two parts one part containing the ADSL signal and the other containing only voice. Filters block the ADSL signal and allow the voice to go through.
Splitters typically have 3 labels:ADSL, PhoneandLine. To use a splitter you connect your telephone devices (eg phone, fax or answering machine) to the connection labelledphone, your ADSL modem to theADSLconnection and thelineto the wall socket. If you have other telephone wall sockets in the property on the same telephone line you will need to plug in filters between the phone and the wall socket.
In addition to the user installable spliter in the photograph above, you can have a central splitterinstalled by a telephone technician. Acentral splitteris installed on the telephone line before the first phone point in the property. Thus the central splitter protects the all the phone exensions from the ADSL signal. A new phone point is wired into the central ADSL splitter specifically for the ADSL modem. The ADSL modem will not work on any other point in the property.
Central Splitters are sometimes used when user installable splitters and filters do not result in a reliable ADSL connection.
VGA SPLITTER
VGA splitter is the perfect device if you need to display the same images to different monitors. It allows you to display the same image on many monitors and cascade relaying of signals at local as well as distant locations simultaneously. It is offered n 2, 4, 8 and 16 ports and the same image can be displayed on upto 16 monitors using this splitter.
For amplified VGA outputs, the cascading function can be utilized. These splitters are compatible with VGA, SVGA and multi sync monitors. It has an impressive bandwidth of 350 MHz and the output is crystal clear images without any signal degradation or breakage. Moreover it also makes the work area clutter free since the computer can now be located in a safe location. It improves the work environment by making it noise free as well.
The commonly used splitter in this particular category is the VGA Splitter. The installation is relatively simple and easy. It works on easy plug and play functionality and can be done in seconds. The splitter is connected via a VGA cable from the computer's graphic port to the splitter input. Out of the many outputs, the focal connection is used for the main display while the rest are connected to other display devices. They come with a built in booster circuit which allows the VGA monitors to be positioned at greater distances from the source. It can be kept on a desktop while the 16 port unit can be rack mounted.
Brands like Intex, Luminous, Cyber Power, Microtek, APC, Numeric etc are available at very attractive prices.
Anuninterruptible power supply, alsouninterruptible power source, UPSorbattery/flywheel backup, is an electrical apparatus that provides emergency power to a load when the input power source, typically mains power, fails. A UPS differs from an auxiliary or emergency power system or standby generator in that it will provide near-instantaneous protection from input power interruptions, by supplying energy stored in batteries or a flywheel. The on-battery runtime of most uninterruptible power sources is relatively short (only a few minutes) but sufficient to start a standby power source or properly shut down the protected equipment.
A UPS is typically used to protect computers, data centers, telecommunication equipment or other electrical equipment where an unexpected power disruption could cause injuries, fatalities, serious business disruption or data loss. UPS units range in size from units designed to protect a single computer without a video monitor (around 200 VA rating) to large units powering entire data centers or buildings.
The primary role of any UPS is to provide short-term power when the input power source fails. However, most UPS units are also capable in varying degrees of correcting common utility power problems:
BNC CONNECTOR, DC WIRE/PIN, SMPS (12V 1A TO 12V 20A), AUDIO BOX, IR 24 LEDs, IR 36 LEDs, IR 48 LEDs, GLASS, DOME CAMERA STAND.
TheBNC connector(Bayonet NeillConcelman)is a miniature quick connect/disconnect RF connector used for coaxial cable. It features two bayonet lugs on the female connector; mating is achieved with only a quarter turn of the coupling nut. BNCs are ideally suited for cable termination for miniature-to-subminiature coaxial cable (e.g., RG-58, 59, to RG-179, RG-316). It is used with radio, television, and other radio-frequency electronic equipment, test instruments, video signals, and was once a popular computer network connector. BNC connectors are made to match the characteristic impedance of cable at either 50 ohms or 75 ohms.
Types and compatibility
TypesBNC connectors exist in 50 and 75 ohm versions, matched for use with cables of the same characteristic impedance. The 75 ohm types can sometimes be recognized by the reduced or absent dielectric in the mating ends. The 50 and 75 ohm connectors are typically specified for use at frequencies up to 4 and 2GHz respectively.
Video and DS3 Telco central office applications primarily use 75 ohm BNC connectors, whereas 50 ohm connectors are used for data and RF. Many VHF receivers used 75 ohm antenna inputs, so they often used 75 ohm BNC connectors.
CompatibilityThe different versions are designed to mate with each other, [2]and a 75ohm and a 50ohm BNC connector which both comply with the 1978 standard, IEC 169-8, will mate non-destructively. At least one manufacturer[4]claims very high reliability for the connectors' compatibility.
At frequencies below 10MHz the impedance mismatch between a 50ohm connector or cable and a 75ohm one has negligible effects.[5]BNC connectors were thus originally made only in 50ohm versions, for use with any impedance of cable. Above this frequency, however, the mismatch becomes progressively more significant and can lead to signal reflections.
BNC inserter/remover toolABNC inserter/remover toolalso called aBNC tool, BNC extraction toolorBNC apple corer, is used to insert or remove BNC connectors in high density or hard-to-reach locations, such as densely wired patch panels in broadcast facilities like central apparatus rooms.
BNC tools are usually light weight, made with stainless steel, and have screw driver type plastic handle grips for applying rotating torque. Their shafts are usually double the length of a standard screw driver.
They help to safely, efficiently and quickly connect and disconnect BNC connectors in jack fields. BNC tools facilitate access and minimize the risk of accidentally disconnecting nearby connectors.
BNC CONNECTOR, DC WIRE/PIN, SMPS (12V 1A TO 12V 20A), AUDIO BOX, IR 24 LEDs, IR 36 LEDs, IR 48 LEDs, GLASS, DOME CAMERA STAND.
TheBNC connector(Bayonet NeillConcelman)is a miniature quick connect/disconnect RF connector used for coaxial cable. It features two bayonet lugs on the female connector; mating is achieved with only a quarter turn of the coupling nut. BNCs are ideally suited for cable termination for miniature-to-subminiature coaxial cable (e.g., RG-58, 59, to RG-179, RG-316). It is used with radio, television, and other radio-frequency electronic equipment, test instruments, video signals, and was once a popular computer network connector. BNC connectors are made to match the characteristic impedance of cable at either 50 ohms or 75 ohms.
Specifications
Power supply like SMPS, UPS are available at attractive prices.Brands like Intex, Zebronics are available.
Apower supplyis a device that supplies electric power to one or more electric loads. The term is most commonly applied to devices that convert one form of electrical energy to another, though it may also refer to devices that convert another form of energy (mechanical, chemical, solar) to electrical energy. A regulated power supply is one that controls the output voltage or current to a specific value; the controlled value is held nearly constant despite variations in either load current or the voltage supplied by the power supply's energy source.
Every power supply must obtain the energy it supplies to its load, as well as any energy it consumes while performing that task, from an energy source. Depending on its design, a power supply may obtain energy from:
A power supply may be implemented as a discrete, stand-alone device or as an integral device that is hardwired to its load. Examples of the latter case include the low voltage DC power supplies that are part of desktop computers and consumer electronics devices.
Commonly specified power supply attributes include:
Switched-mode power supplies are always regulated. To keep the output voltage constant, the power supply employs a feedback controller that monitors current drawn by the load. The switching duty cycle increases as power output requirements increase.
SMPSs often include safety features such as current limiting or a crowbar circuit to help protect the device and the user from harm. In the event that an abnormal high-current power draw is detected, the switched-mode supply can assume this is a direct short and will shut itself down before damage is done. PC power supplies often provide apower goodsignal to the motherboard; the absence of this signal prevents operation when abnormal supply voltages are present.
SMPSs have an absolute limit on their minimum current output. They are only able to output above a certain power level and cannot function below that point. In a no-load condition the frequency of the power slicing circuit increases to great speed, causing the isolated transformer to act as a Tesla coil, causing damage due to the resulting very high voltage power spikes. Switched-mode supplies with protection circuits may briefly turn on but then shut down when no load has been detected. A very small low-power dummy load such as a ceramic power resistor or 10-watt light bulb can be attached to the supply to allow it to run with no primary load attached.
Power factor has become an issue of concern for computer manufacturers. Switched mode power supplies have traditionally been a source of power line harmonics and have a very poor power factor. The rectifier input stage distorts the waveshape of current drawn from the supply; this can produce adverse effects on other loads. The distorted current causes extra heating in the wires and distibution equipment. Switched mode power supplies in a building can result in poor power quality for other utility customers. Customers may face higher electric bills for a low power factor load.
Some switch-mode power supplies use filters or additional switching stages in the incoming rectifier circuit to improve the waveform of the current taken from the AC line. This adds to the circuit complexity. Many computer power supplies built in the last few years now include power factor correction built right into the switched-mode supply, and may advertise the fact that they offer1.0 power factor.
All cameras are available in Dome/Dome IR/ Dome camera IR CMOS and Outdoor/ Outdoor IR with 3.6 mm/6mm/8mm/12mm lens.
Closed-circuit television (CCTV) camerascan produce images or recordings for surveillance purposes, and can be either video cameras, or digital stills cameras.
Video camerasare either analogue or digital, which means that they work on the basis of sending analogue or digital signals to a storage device such as a video tape recorder or desktop computer or laptop computer.
Analogue
Can record straight to a video tape recorder which are able to record analogue signals as pictures. If the analogue signals are recorded to tape, then the tape must run at a very slow speed in order to operate continuously. This is because in order to allow a three hour tape to run for 24 hours, it must be set to run on a time lapse basis which is usually about four frames a second. In one second, the camera scene can change dramatically. A person for example can have walked a distance of 1 meter, and therefore if the distance is divided into four parts, i.e. four frames or "snapshots" in time, then each frame invariably looks like a blur, unless the subject keeps relatively still.
Analogue signals can also be converted into a digital signal to enable the recordings to be stored on a PC as digital recordings. In that case the analogue video camera must be plugged directly into a video capture card in the computer, and the card then converts the analogue signal to digital. These cards are relatively cheap, but inevitably the resulting digital signals are compressed 5:1 (MPEG compression) in order for the video recordings to be saved on a continuous basis.
Another way to store recordings on a non-analogue media is through the use of a digital video recorder (DVR). Such a device is similar in functionality to a PC with a capture card and appropriate video recording software. Unlike PCs, most DVRs designed for CCTV purposes are embedded devices that require less maintenance and simpler setup than a PC-based solution, for a medium to large number of analogue cameras.
Some DVRs also allow digital broadcasting of the video signal, thus acting like a network camera. If a device does allow broadcasting of the video, but does not record it, then it's called a video server. These devices effectively turn any analogue camera (or any analogue video signal) into a network TV.
DigitalSaving uncompressed digital recordings takes up an enormous amount of hard drive space, and a few hours of uncompressed video could quickly fill up a hard drive. Holiday uncompressed recordings may look fine but one could not run uncompressed quality recordings on a continuous basis. Motion detection is therefore sometimes used as a work around solution to record in uncompressed quality.
However, in any situation where standard-definition video cameras are used, the quality is going to be poor because the maximum pixel resolution of the image chips in most of these devices is 320, 000 pixels (analogue quality is measured in TV lines but the results are the same); they generally capture horizontal and vertical fields of lines and blend them together to make a single frame; the maximum frame rate is normally 30 frames per second.
That said, multi-megapixel IP-CCTV cameras are coming on the market. Still quite expensive, but they can capture video images at resolutions of 1, 2, 3, 5 and even up to 11 Mpix. Unlike with analogue cameras, details such as number plates are easily readable. At 11 Mpix, forensic quality images are made where each hand on a person can be distinguished. Because of the much higher resolutions available with these types of cameras, they can be set up to cover a wide area where normally several analogue cameras would have been needed.
NetworkBecause network cameras are embedded devices, and do not need to output an analogue signal, resolutions higher than CCTV analogue cameras are possible. A typical analogue CCTV camera has a PAL (768576 pixels) or NTSC (720480 pixels), whereas network cameras may have VGA (640480 pixels), SVGA (800600 pixels) or quad-VGA (1280960 pixels, also referred to as "megapixel") resolutions.
An analogue or digital camera connected to a video server acts as a network camera, but the image size is restricted to that of the video standard of the camera. However, optics (lenses and image sensors), not video resolution, are the components that determine the image quality.
Network cameras can be used for very cheap surveillance solutions (requiring one network camera, some Ethernet cabling, and one PC), or to replace entire CCTV installations (cameras become network cameras, tape recorders become DVRs, and CCTV monitors become computers with TFT screens and specialised software. Digital video manufacturers claim that turning CCTV installations into digital video installations is inherently better).
There continues to be much debate over the merits and price-for-performance of Network cameras as compared to analog cameras. Many in the CCTV industry claim that many analog cameras can outperform network cameras at a lower price.
all cameras are available in dome/dome ir/ dome camera ir cmos and outdoor/ outdoor ir with 3.6 mm/6mm/8mm/12mm lens.
closed-circuit television (cctv) camerascan produce images or recordings for surveillance purposes, and can be either video cameras, or digital stills cameras.
video camerasare either analogue or digital, which means that they work on the basis of sending analogue or digital signals to a storage device such as a video tape recorder or desktop computer or laptop computer.
analogue
can record straight to a video tape recorder which are able to record analogue signals as pictures. If the analogue signals are recorded to tape, then the tape must run at a very slow speed in order to operate continuously. This is because in order to allow a three hour tape to run for 24 hours, it must be set to run on a time lapse basis which is usually about four frames a second. In one second, the camera scene can change dramatically. A person for example can have walked a distance of 1 meter, and therefore if the distance is divided into four parts, i.e. Four frames or "snapshots" in time, then each frame invariably looks like a blur, unless the subject keeps relatively still.
analogue signals can also be converted into a digital signal to enable the recordings to be stored on a pc as digital recordings. In that case the analogue video camera must be plugged directly into a video capture card in the computer, and the card then converts the analogue signal to digital. These cards are relatively cheap, but inevitably the resulting digital signals are compressed 5:1 (mpeg compression) in order for the video recordings to be saved on a continuous basis.
another way to store recordings on a non-analogue media is through the use of a digital video recorder (dvr). Such a device is similar in functionality to a pc with a capture card and appropriate video recording software. Unlike pcs, most dvrs designed for cctv purposes are embedded devices that require less maintenance and simpler setup than a pc-based solution, for a medium to large number of analogue cameras.
4 channel 1 & 4 audio, 4 channel 4 audio with 3G, 8 channel 4 audio, 8 channel 8 audio, 16 channel 4 audio, 16 channel 16 audio
Adigital video recorder(DVR), sometimes referred to by the merchandising term personal video recorder (PVR), is a consumer electronics device or application software that records video in a digital format to a disk drive, USB flash drive, SD memory card or other local or networked mass storage device. The term includes set-top boxes (STB) with direct to disk recording facility, portable media players (PMP) with recording, recorders (PMR) as camcorders that record onto Secure Digital memory cards and software for personal computers which enables video capture and playback to and from a hard disk.
Digital video recorders configured for physical security applications record video signals from closed circuit television cameras for detection and documentation purposes. Many are designed to record audio as well. DVRs have evolved into devices that are feature rich and provide services that exceed the simple recording of video images that was previously done through VCRs. A DVR CCTV system provides a multitude of advanced functions over VCR technology including video searches by event, time, date and camera. There is also much more control over quality and frame rate allowing disk space usage to be optimized and the DVR can also be set to overwrite the oldest security footage should the disk become full. In some DVR security systems remote access to security footage using a PC can also be achieved by connecting the DVR to a LAN network or the internet. videoNEXT also makes a NVR surveillance application for the Mac OS X. Some of the latest professional digital video recorders include video analytics firmware, to enable functionality such as 'virtual tripwire' or even the detection of abandoned objects on the scene.
Security DVRs may be categorized as being either PC based or embedded. A PC based DVRs architecture is a classical personal computer with video capture cards designed to capture video images. An embedded type DVR is specifically designed as a digital video recorder with its operating system and application software contained in firmware or read only memory.
Hardware featuresHardware features of security DVRs vary between manufacturers and may include but are not necessarily limited to
Software features vary between manufacturers and may include but are not necessarily limited to
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Product list is provided below:-
All types of mouse & mouse pads are available whether usb, ps/2 or optical mouse. In mouse pads (L, pictures & animal shapes).
Anoptical computer mouseor "optic mouse" uses a light-emitting diode and photodiodes to detect movement relative to a surface, unlike a mechanical mouse which has a ball which rotates orthogonal shafts which drive chopper wheels for distance measurement. The earliest optical mice detected movement on pre-printed mousepad surfaces, whereas the modern optical mouse works on most opaque surfaces; it is unable to detect movement on specular surfaces like glass. Laser diodes are also used for better resolution and precision. Battery powered, wireless optical mice flash the LED intermittently to save power, and only glow steadily when movement is detected.
Unlike mechanical mice, which can become clogged with lint, optical mice have no moving parts; therefore, they do not require maintenance other than removing debris that might collect under the light emitter. However, they generally cannot track on glossy and transparent surfaces, including some mouse-pads, sometimes causing the cursor to drift unpredictably during operation. Mice with less image-processing power also have problems tracking fast movement, though some mice can track faster than 2 m/s (80inches per second).
Some models of laser mouse can track on glossy and transparent surfaces, and have a much higher sensitivity than other mechanical or optical mice, but are more expensive than their LED-based or mechanical counterparts.
As of 2006, mechanical mice had lower average power requirements than their optical counterparts; the power used by mice is relatively small, and only an important consideration when the power is derived from batteries, with their limited capacity.
Optical models outperform mechanical mice on uneven, slick, soft, sticky, or loose surfaces, and generally in mobile situations lacking mouse pads. Because optical mice render movement based on an image which the LED (or infrared diode) illuminates, use with multicolored mouse pads may result in unreliable performance; however, laser mice do not suffer these problems and will track on such surfaces. The advent of affordable high-speed, low-resolution cameras and the integrated logic in optical mice provides an ideal laboratory for experimentation on next-generation input-devices.
