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Circuits designed by David Johnson, P.E.

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Last Updated on:  06/17/2009 03:29:23 PM

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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.

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

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Master Schematic Category List - David A. Johnson, P.E.
 
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