A portable FM transmitter that can be used to replace a FM microphone. This simple transmitter operates from a 9V battery as shown above. The old FM mic system was not a perfect solution, so I built this kit and a mixer for the receivers. using three separate transmitter circuits and a mixer on the receiver, the choir voices were perfect and cleanly reproduced."
From the notes I made experimentally, C3 is vital to the circuit and without it the circuit may become unstable. C4 is in parallel with C5 and presents a moderate load impedance. Finally all transistors are NPN. The circuit works well and has proved reliable. Microphone FM Transmitter Circuit
Continue reading: TV transmitter - Transistor FM Transmitter - Voice FM Transmitter
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