DiscoverCircuits.com, has 28,000+ 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 your design.
The contents & graphics of Discovercircuits.com are copyrighted. LINKING to Dave's circuits is permitted
but DO NOT COPY this data to your WEB SITE server.
Click on Drawing Below to view PDF version of Schematic
Plastic Pipe Finder
I used this circuit once to track down the location of a plastic pipe, buried underground. It transmits a weak RF signal, which can be picked up by a portable AM radio from about 6 feet away.
