AVC_AND_VOX

Published:2009/7/14 7:59:00 Author:May | From:SeekIC

Voice-operated ON/OFF switch uses microphone to sense normal back-ground sound. Anything above background threshold preset by R16 energizes relay K for turning on recorder. Circuit provides about 2-s delay after subject stops talking, before releasing relay. Automatic volume control circuit keeps recorded signal essentially constant despite movements of loudspeaker toward or away from microphone.-G. Beard, Automatic Volume and VOX for Your Tape Recorder, Popular Science, Oct. 1973, p 134 and 136.



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