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Last Updated on: Tuesday, October 14, 2014 06:33 AM

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More  Switch Circuits

Audio Signal Detector Switch
 

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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