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IR InfraRed Communication circuit – Circuit Schematic
IR InfraRed Communication circuit
The founts must notify the server in the event of the cup being taken from the fount or the opponent`s cup being poured  into the team`s cup. It is up to the ...
intercom – Circuit Schematic
intercom
This intercom uses an ordinary speaker to function as its microphone. Once the button is pressed, the relay toggles, and the speakers interchange their function...
RS232 transceiver circuits – Circuit Schematic
RS232 transceiver circuits
There are several RS232 transceiver circuit used for commond communicated between microcontroller and other devices such as PCs or devices rs232. Here is a coll...
LASER Transmitter/Receiver – Circuit Schematic
LASER Transmitter/Receiver
In the transmitter schematic, no ballast resistor is shown because most small LASER power supplies already have one built in. Yours may differ, and a resistor m...
Wireless IR headphone transmitter – Circuit Schematic
Wireless IR headphone transmitter
Wireless IR headphone transmitter. Audio input from PL1 frequency modulates the VCO section of a 4046 PLL chip. The VCO output drives Q1, a switching transistor...
Low-Cost and Simple Intercom – Circuit Schematic
Low-Cost and Simple Intercom
This is a low-cost and simple intercom circuit design which utilizes 3 transistors. Even a newbie can assemble it on a piece of veroboard without difficulty...
Long distance infrared transmitter circuit diagram – Circuit Schematic
Long distance infrared transmitter circuit diagram
Long distance infrared transmitter circuit diagram. Here is a simple circuit that will give you a pretty long range. It uses three infrared transmitting LEDs (I...
Laser Communication (Transmitter-Receiver) – Circuit Schematic
Laser Communication (Transmitter-Receiver)
Laser communication system circuit diagram. The circuit module consists of a transmitter and also a receiver which use IC LM386. It is powered by a 9V battery...
Video Switch for Intercom System – Circuit Schematic
Video Switch for Intercom System
Nowadays a lot of intercom units are equipped with video cameras so that you can see as well as hear who is at the door. Unfortunately, the camera lens is perfe...
simple FSK/AFSK Modulator – Circuit Schematic
simple FSK/AFSK Modulator
Audio frequency-shift keying (AFSK) is a modulation technique by which digital data is represented by changes in the frequency (pitch) of an audio tone, yieldin...
YUV/YCbCr to RGB converter – Circuit Schematic
YUV/YCbCr to RGB converter
Video recorder, DVD player and TV game, have component video output. The component video signal is like RGB video signal, but it cannot connect to RGB monitor....
Video modulator 2 – Circuit Schematic
Video modulator 2
This circuit permits direct connection of composite video signals from video games and microcomputers to the antenna terminals of TV sets. The output signal lev...
Video Signal Carrier Circuit – Circuit Schematic
Video Signal Carrier Circuit
In the video system of Figs. A and R, a single coaxial cable carries power to the remote location, selects one of eight video channels, and returns the selected...
Video Isolator – Circuit Schematic
Video Isolator
These days many more audio-visual devices in the home are connected together. This is especially the case with the TV, which may be connected to a DVD player, a...
Video Fader Circuit – Circuit Schematic
Video Fader Circuit
Fading a video signal can`t be done simply by attenuating the composite signal, since the synchronization signal may drop below unacceptable level. Here a ....
Twisted-Pair Video Cable Driver and Receiver – Circuit Schematic
Twisted-Pair Video Cable Driver and Receiver
Twisted-pair wiring is a wiring technique that usually used for in-building data communication. Compared to conventional coaxial-cable, this technique offers....
Split-Phase Data Synchronization and Decoding – Circuit Schematic
Split-Phase Data Synchronization and Decoding
A split-phase data signal consists of a series of binary digits that occur at a periodic rate, as shown in waveform A in the timing chart. The weight of each....
Simple Intercom Circuit Transistor – Circuit Schematic
Simple Intercom Circuit Transistor
Circuit diagram is a simple but effective circuit intercom circuit is based entirely on transistors. Circuit diagram is based on three stages plus RC amplifier....
Powerline Carrier-Current Remote Control or Intercom – Circuit Schematic
Powerline Carrier-Current Remote Control or Intercom
Using 567 IC tone decoder/detector, we can build a remote control and or intercom. This circuit can be used to control a relay, or to carry an audio signal ....
Laser Communication (Transmitter – Circuit Schematic
Laser Communication (Transmitter
This is the circuit diagram of laser communication system that transmit the sound or music signals by way of a laser beam. The intensity of the laser beam varie...