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Circuits designed by David Johnson,
P.E.
Last Updated on:
Saturday, December 23, 2017 03:21 PM
Master Category List - Dave's Circuits
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More
Geophones Motion Detectors |
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Human Traffic Footstep Detector
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This circuit uses a surplus geophone to detect human footsteps from 100 feet away.
It was designed for monitoring the Mexico/USA border. This preamp part of the
system draws about 50 microamps from a 12 volt supply. |
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Click on Drawing Below to view PDF version of Schematic |
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