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FM transmitter microphone

2016-02-16 21:53  
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An op-amp IC (741) amplifies the audio signal from MIC1, and R12 controls its gain. Audio is fed to the oscillator circuit Q1 and related components. D2 is a varactor diode. Audio fed to D2 causes FM of the oscillator signal.
FM transmitter microphone

L1 is 3 turns of #18 wire. The antenna is a 12` whip.



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