Circuit - MACHINE VIBRATION TRIGGERS HOUR METER - Circuits designed by David A. Johnson, P.E.


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Circuits designed by David Johnson, P.E.

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Last Updated on: Monday, August 18, 2008 04:19 PM

Hour Meters

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

Click on Drawing Below to view PDF version of Schematic

Hour Meters
Master Schematic Category List - David A. Johnson, P.E.