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DiscoverCircuits.com -- Hobby Corner
Last Updated on:
Wednesday, June 02, 2021 01:18 PM
Hobby Circuits List
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LINK to Dave's circuit, but DO NOT COPY any files to your WEB
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More
Switch Circuits,
Micropower Circuits |
Audio Signal Detector/Switch Circuit
designed
by David A. Johnson, P.E.
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For some audio systems it is desirable to have
an automatic switch circuit turn on other devices, such as an Amplifier, if an audio
signal is detected on one line. The hobby circuit below will activate a
transistor switch when it detects at least 50mv peak to peak of an audio signal.
The switch could be used to turn on a relay, routing the signal to where it is
needed. A single 3v lithium cell will power the electronic circuit for about 5
years. |
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Click on Circuit Below to view PDF of Schematic |
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