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DiscoverCircuits.com -- Hobby Corner
Last Updated on:
Friday, December 29, 2017 05:52 AM
Hobby Circuits List
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More
Control Circuits
Hour Meters Testers |
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CT Hour Meter --
February 13, 2010
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| Many 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 detect the
AC current. |
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| The
output of the transformer is fed to a voltage doubler circuit. When 0.5 AC Amps or
more of current is flowing, the circuit generates sufficient voltage to turn on the
n-channel MOSFET. Once tuned on, the transistor routes voltage to the hour meter.
Some hour meters contain their own battery, so no external power is needed.
In those cases, the transistor switch alone will turn
on the hour meter. |
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Magnetics
Inc CR3110-3000
Current Transformer |
Hour Meter |
Hour Meter |
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Click on Drawing Below to view PDF version of Schematic |
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