This is the circuit connection of home telephone call recorder that uses very few components. In order to understand its working, we must first have […]

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 […]

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 […]

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 […]

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 […]

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 […]

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 […]

The following diagram is the circuit diagram of telephone amplifier, build based small amplifier IC LM386. This is a easy build telephone amplifier There is […]

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