This is the circuit connection of home telephone call recorder that uses very few components. In order to understand its…
This is the schematic diagram of Infrared (IR) cordless headphone. Maybe it also can be called "wireless headphone", but it…
This kind of circuit is a helpful device for testing of infrared (IR) based remote control transmitters utilized for TVs…
Here is the remote control tester circuit. This circuit is really a simple and easy tester for verifying the basic…
Here the long range/distance Infrared transmitter circuit, give you extra power for your Infrared transmitter. The majority of the IR…
This is a low-cost and simple intercom circuit design. Some intercom circuits is build by applying integrated circuits. The circuit…
The circuit, consisting of an infrared transmitter-receiver pair, utilizes IR beam transmission to switch the toy car "on" or "off',…
This is the circuit diagram of laser communication system that transmit the sound or music signals by way of a…
This diagram is the schematic diagram of telephone switcher using relays. This device connects to the telephone line and can…
The following diagram is the circuit diagram of telephone amplifier, build based small amplifier IC LM386. This is a easy…