RF-powered sidetone oscillator

  
A sidetone oscillator is a special audio astable multivibrator. Keying is accomplished oscillator that is turned on and off with the by applying a positive dc potential, developed transmitter. The oscillator is rf-driven and bat- from the rf signal, to the reset terminal of the tery operated
RF-powered sidetone oscillator - schematic

It uses a 555 IC timer as an 555.




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