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Circuits designed by David Johnson, P.E.
Last Updated on: Friday, March 12, 2010 12:08 PM

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Pump Motor Monitor
This circuit can turn on a light or sound a beeper, whenever an AC line powered pump motor turns on.  It is designed to detect the motor current using a small inductor placed on the outside of the motor’s power cable.  No direct wire contact is needed.
 

Click on Drawing Below to view PDF version of Schematic

Circuit Pump Motor Monitor designed by David Johnson, P.E. (Nov 18, 2004)

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