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Circuits designed by David Johnson, P.E.

Master Category List - Dave's Circuits
Last Updated on: Saturday, June 28, 2008 01:21 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

Machine Vibration Activated Hour Meter designed by Dave Johnson, P.E. (Dec 26, 1998)

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

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