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Circuits designed by David Johnson, P.E.
Last Updated on: Monday, July 11, 2016 01:59 PM

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Sensors / Detectors: Seismic Monitors,
Geophones Circuits

Detector for Human Footsteps  -  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 micro Amps from a 12 volt supply . . . [Hobby Circuit designed by Dave Johnson P.E.,  07/11/06]


Footstep Alarm for Human Traffic  -  This circuit processes the Amplified signals from the footstep detector circuit and activates a microprocessor when the circuit detects footsteps.  At has an adjustable sensitivity . . . [Hobby Circuit designed by David Johnson P.E.,  07/11/06]


Home Made Geophone Detects Foot Steps  -  A home made geophone is made from a strong magnet, a coil of wire and a rubber band. The circuit is sensitive enough to detect the vibrations of a nearby foot stomp.  It could be used as an earthquake detector. . . . [Hobby Circuit designed by Dave Johnson P.E.,  06/02/06]


Human Footstep Alarm  -  This circuit processes the Amplified signals from the footstep detector circuit and activates a microprocessor when the circuit detects footsteps.  At has an adjustable sensitivity . . . [Circuit by David Johnson P.E.,  07/11/06]


Human Traffic Footstep Detector Preamp  -  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 micro Amps from a 12 volt supply . . . [Circuit by Dave Johnson P.E.,  07/11/06]


Make a Geophone to Detect Foot Steps  -  A home made geophone is made from a strong magnet, a coil of wire and a rubber band. The circuit is sensitive enough to detect the vibrations of a nearby foot stomp.  It could be used as an earthquake detector. . . . [Circuit by David Johnson P.E.,  06/02/06]

More  Seismic Monitors, Geophones Circuits
 

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The circuits on this site are designed by David A Johnson - unless otherwise noted.  David A. Johnson & Associates.  All Rights reserved. 
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