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NNTP-Posting-Date: Wed, 08 Jan 2003 13:23:31 -0600
From: Barry Lennox
Subject: Re: Need idea for a remote lamp status indicator.
Date: Thu, 09 Jan 2003 08:25:32 +1300
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On Wed, 08 Jan 2003 12:32:25 -0500, Glenn Ashmore
> From inside the cabin I can't see the switch position or the lights. I
>need a circuit design that will light an LED on the switch box when the
>light is on. Because of the possibility of a burned out bulb or broken
>wire the circuit has to know that current is actually flowing and not
>just that the MOSFET is on. The circuit must also have minimum effect
>on the power reaching the light.
1. Wrap several turns of heavy wire around a reed switch, this will
close with current passing, although your 2 amps may be just on the
low side for this to work reliably. Depends on the reed's sensitivity,
and a quick experiment will prove it..
2. Cut a small slit in a toroid and epoxy a Hall effect sensor in the
slit, then wind a few turns of heavy wire around the toroid. This
works very well, the only problem is cutting the slit in the toroid. I
have tried a cutoff disk in a Dremel tool, but it's a tricky task, so
now use a metal-cutting blade in a scrollsaw. This works much better.
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