This cut phone line detector circuit is used to detect whether your phone line is active or not. Components List: R1,R2,R3 = 22M Ohms R4 […]

This a two station intercom. It uses two wires to run between each intercom unit. Each is self contained with its own battery, speaker, microphone […]

Here is the circuit diagram of ultrasonic sensor switch. There are many methods of wireless switching such as by using infrared, AM/FM signal, bluetooth, etc. […]

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