DiscoverCircuits.com, has 30,000+ electronic
circuits, cross-referenced
into 500+ categories. We have searched the web to help you
find quick design ideas.
We make every effort to link to material posted by the designer.
Please let us if you would like us to link to or post your
design.
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
