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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)
MACHINE VIBRATION TRIGGERS HOUR METER
This circuit allows an off-the-shelf battery powered digital hour meter to be turned
on and off, according to a machine's operation, without requiring a direct
electrical connection to the machine. Machine vibrations are detected by an
off-the-shelf piezoelectric wafer. The wafer is normally used as a sound generator.
The 3v power could be tapped from the hour meter's own lithium battery or from a
separate 3v lithium battery. The circuit only draws about 1.5uA, so a 250mA-hr
battery would power the circuit for about 10 years.
Published in EDN, Jan 16, 1997
Links to electronic circuits, electronic schematics, designs for engineers,
hobbyists, students & inventors:
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.... [Designed by David A. Johnson]
Machine Vibration Activates Hour Meter - 01/16/97 EDN-Design
Ideas....Battery-powered digital hour meters commonly monitor how long a
machine is in operation by detecting when the machine is supplied with
power. However, it is often difficult or dangerous to connect a
battery-powered hour meter to a line-powered machine. When the machine being
monitored....Yes, this is the Dave Johnson of www.discovercircuits.com
[Design Idea by David Johnson, David Johnson and Associates, Littleton, CO]
Machine Vibration Controls Hour Meter - This circuit allows an
off-the-shelf battery powered digital hour meter to be turned on and off,
according to a machine's operation, without requiring a direct electrical...
Published in EDN, Jan 16, 1997 …. [Hobby Corner Circuit by Dave Johnson]
Piezo Vibration Sensors - Circuit diagram of the vibration sensing circuit
out of a toy dog that barks when he senses a thump nearby… [Reverse engineered
schematic by Stepan Novotill]
