MICROPHONE_CONTROLLED_VOICEACTIVATED_SWITCH

Published:2009/7/10 3:31:00 Author:May | From:SeekIC

An electret microphone feeds a bandpass ftlter circuit (IC1A), then feeds a comparator, which in turn drives Q1. Q1 is a switch that conducts when audio from IC1B causes D1. C4. R6. and R7 to bias it oN.



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