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Last Updated on:
Tuesday, June 01, 2021 03:06 PM
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High DC Current Indicator
designed
by David A. Johnson, P.E.
(6/11/2013) |
| A while back, someone
requested a simple method to indicate when 20 to 50 Amps of DC current was flowing
through a wire. The circuit below works well and is about as simple as you can get.
A sensitive reed relay from
www.Jameco.com acts as the current sensor. |
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| The
magnetic field produced by such a current is enough to close the relay contacts, if one
or two turns are wound around the relay. The turns do not have to be tight. I was able
to close the contacts with two turns about 2 inches in diameter with 20 Amps. A simple
LED and resistor can be used to indicate the current by tapping into the automotive +12v
supply. |
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eMail David A.
Johnson, P.E. about this circuit |
