Simple FM Transmitter

Posted on Feb 4, 2014

Frequency range is 100-108 MHz. The circuit is only mono circuit, and accepts an audio input from either a microphone or other source. The input impedance is 1Mohm. The input sensitivity is 5mV and the max input signal is 10mV. The transmitted signal can be picked up on a FM radio. The circuit can be used for short-range transmission, eg. for wir

Simple FM Transmitter
Click here to download the full size of the above Circuit.

eless microphones. The power supply to use is 9-14 V DC, one of the little rectangular 9V batteries is fine. Connect this to the + and - points on the PCB. The sound input goes to the points marked "MIKE". The antenna should be connected to the point marked "ANT". The emitter`s output impedance is 50 ohms. You can make your own fancy antenna if you like.

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