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From: Glenn Ashmore
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:0.9.4) Gecko/20011128 Netscape6/6.2.1
Subject: Need idea for a remote lamp status indicator.
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NNTP-Posting-Date: Wed, 08 Jan 2003 12:19:10 EST
Date: Wed, 08 Jan 2003 12:32:25 -0500
I am working up a design for a MOSFET based switch box to control the
lights on my boat's mast from the cockpit. These lights cannot have
more than a 3% voltage drop from the battery so wire runs have to be as
short as possible and the run up the mast and back to the switch box is
130' long. The switch box will eliminate about 50' of wire from the
mast to the cockpit but there is a drawback.
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.
Specifics: The voltage is 12-13.8VDC and the load ranges from 2A to 7A
depending on the light. The MOSFETs are 30 amp IRFZ34 driven at close
to max Vgs.
I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com
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