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Hour Meter Circuits
 

Last Updated: December 31, 2017 06:49 AM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Circuits Designed by Dave Johnson, P.E. :

AC Current Controls Hour MeterMany systems require routine maintenance based on machine operation time.  The circuit below is a simple way to turn on a hour meter whenever AC power is supplied to the machine.  An inexpensive snap-on current transformer from Magnetics Inc, is used to. . . Circuit by David A. Johnson P.E.-February, 2010

CT Hour MeterMany systems require routine maintenance based on machine operation time.  The circuit below is a simple way to turn on a hour meter whenever AC power is supplied to the machine.  An inexpensive snap-on current transformer from Magnetics Inc, is used to . . . Hobby Circuit designed by David Johnson P.E.-February, 2010

Hour Meter triggered by Machine VibrationThis hobby 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 . . . Hobby Circuit designed by David Johnson P.E.-January, 1998

Machine Vibration Triggers Hour MeterThis 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 piezo. . . Circuit by David A. Johnson P.E.-January, 1998

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Hour-Meter Circuits


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