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RE_POWERED_SIDETONE_OSCILLATOR

2016-08-07 19:03  
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RE_POWERED_SIDETONE_OSCILLATOR
A sidetone oscillator is a special audio oscillator that is turned on and off with the transmitter. The oscillator is rf-driven and bat-tery operated. It uses a 555 IC timer as an astable multivibrator. Keying is accomplished by applying a positive dc potential, developed from the rf signal, to the reset terminal of the 555.