Simple Fm Transmitter Circuit

  
Running from a 9-V battery, this transmitter can be used as a wireless microphone with an ordinary 88- to 108-MHz FM broadcast receiver. Keep the antenna length under 12 inches to comply with FCC limits. LI is 6 turns of #24 wire wound around a pencil or a 14 form, with turns spaced 1 wire diameter.
Simple Fm Transmitter Circuit - schematic

C6 is a gimmick capacitor of about 1 pF.




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