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Sensors / Detectors: Vibration Monitors
Last Updated on:
Tuesday, April 22, 2008 03:50 PM |
| Sensors / Detectors -- Main Page |
| 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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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 produces de-tectable vibrations, you can use the circuit in Figure 1, which doesn't require any power-line connections. The
circuit uses just one IC and allows you to turn a battery-powered hour meter on and off according to a machine's vibration. (added 09/05) |
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Shock Sensor Circuit Prevents Data Corruption: 07/04/96 EDN-Design Ideas / (added 3/03) |
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Vibrato Effect: (electronic circuit added 10/06) |
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