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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)
