Simple FM transmitter

  
This transmitter can be tuned to the FM broadcast band, 2 meters,-or other VHF bands by changing C5 and Ll. The values given for C5 and Ll will place the frequency somewhere in the FM broadcast band. Ll is 4 turns of #20 enameled wire airwound, % inch in diameter, 5mm long and center-tapped. The microphone is an electret type and the antenna is 18 inches of any type of wire
Simple FM transmitter - schematic

Keep all leads as short as possible to minimize stray capacitance. The range of the transmitter is several hundred yards.





 

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