Category Archives: Communication

Infrared (IR) Cordless Headphone

This is the schematic diagram of Infrared (IR) cordless headphone. Maybe it also can be called “wireless headphone”, but it use infrared as sound signal carrier. It use a pair of circuit diagrams that are IR transmitter and IR reveiver. Using this low-cost project one can reproduce audio from TV or other electronic devices without… Read More »

Simple Sensitive Tester for Infrared (IR) Remote Control

This kind of circuit is a helpful device for testing of infrared (IR) based remote control transmitters utilized for TVs and VCRs and so forth. The IR motions from a remote control transmitter are sensed by the IR sensor module in the analyzer and its output at pin 2 goes low. This thusly switches on… Read More »

Remote Control Tester

Here is the remote control tester circuit. This circuit is really a simple and easy tester for verifying the basic operations of an infrared remote control unit. It is low-cost and very easy to construct. The tester is designed around infrared receiver module TSOP1738. Operation of the remote control is identified by a tone from… Read More »

Long Range/Distance Infrared Transmitter

Here the long range/distance Infrared transmitter circuit, give you extra power for your Infrared transmitter. The majority of the IR remotes do the job reliably within a range of 5 metres. The circuit complexity increases in case you design the IR transmitter for good operation more than a extended distance, for example, 10 metres. To… Read More »

Low-Cost and Simple Intercom

This is a low-cost and simple intercom circuit design. Some intercom circuits is build by applying integrated circuits. The circuit described right here utilizes 3 certainly transistors which easy to find on the electronic store. Even a newbie can assemble it on a piece of veroboard without difficulty. The circuit consists of a 3-stage resistor-capacitor… Read More »

Toy Car Remote Control

The circuit, consisting of an infrared transmitter-receiver pair, utilizes IR beam transmission to switch the toy car ‘on’ or ‘off’, yeah… it will be only switching on and switching off, you may modify this circuit to make the toy car to turn left or right. To operate the toy car, you have to hold the… Read More »

Laser Communication (Transmitter – Receiver)

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 varies together with the amplitude of the sound signal. The variation within the intensity of the laser beam is converted into a variation in the voltage level… Read More »

Telephone Switcher

This diagram is the schematic diagram of telephone switcher using relays. This device connects to the telephone line and can be used to remotely control up to 4 relay outputs using a DTMF (tone dialing) telephone. A number of user settings are available to improve the useability and security of the device. The kit comes… Read More »

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