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Sensors / Detectors: Seismic Monitors, Geophones Circuits
Designed by David A. Johnson, P.E.

Last Updated on: Sunday, July 27, 2008 07:41 PM
Master Category List - Dave's Circuits
 

  • Home Made Geophone Detects Foot Stomp
    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.  (added 7/06)

  • Human Traffic Footstep Detector
    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.      (added 12/04)
  • Human Traffic 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.      (added 12/04)


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