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Sensors / Detectors: Vibration Monitors
Sensors / Detectors -- Main Page
Last Updated on:
Friday, October 16, 2009 03:42 AM |
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| Circuits Designed by Dave
Johnson, P.E. : |
- 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)
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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
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Links to electronic circuits, electronic schematics, designs for engineers,
hobbyists, students & inventors:
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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) ….(designed by David A. Johnson) |
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Machine Vibration Activates Hour Meter - 01/16/97 EDN-Design Ideas: by David
Johnson 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....(added 09/05) |
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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 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 ….(designed by David A. Johnson) |
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Shock Sensor Circuit Prevents Data Corruption - 07/04/96 EDN-Design Ideas:
(design idea added 3/03) |
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