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Audio Signal Detector Switch

2016-01-14 20:12  
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This circuit will activate a transistor switch when it detects at least 50mv peak to peak of an audio signal.  It could be used to turn on a relay, routing the signal to were it is needed.Click on Drawing Below to view PDF version of Schematic


Circuit Audio Activated Switch Circuit designed by David Johnson, P.E. (June 30, 2006)





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