FM Transmitter | Simple FM Transmitter Circuit

This is a circuit diagram of FM microphone speak in microphone and hear your voice on FM receiver. The circuit contains microphone preamp for increasing the signal of weak sounds. If you wind the coil correctly then the circuit will perform very well. Make coil L1 accurately as shown in diagram. If you want good speech quality use ceramic or crystal microphone.

Simple Telephone Line Tap Circuit

Circuit is extremely simple, therefore there is less chance of any problems. It can be placed anywhere on the phone line and it will record any conversation on any phone on that line.