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Hour Meter Circuits
Designed by David A. Johnson, P.E.

Last Updated on: Thursday, January 01, 2009 06:56 AM

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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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