NNTP-Posting-Date: Thu, 09 Jan 2003 23:27:38 -0600
From: Barry Lennox
Subject: Re: Need idea for a remote lamp status indicator.
Date: Fri, 10 Jan 2003 18:29:49 +1300
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On Thu, 09 Jan 2003 19:40:39 -0500, Glenn Ashmore
>To bring everyone up to date, I have breadboarded the voltage doubler to
>get Vgs, the MOSFET switch and the shunt/comparator idea Spehro
>suggested and it works with almost no detectable loss to the lamp but it
>sure takes a lot of parts. That is why I want to try the reed switch.
>I ordered some from Digikey with the rest of the known parts for the
>final panel and will give them a try. I had no idea how much cheaper
>Digikey is than the local electronics houses! The parts for the
>breadboard test cost over $29. I got enough for 6 circuits from Digikey
>for $45. OTOH, the same thing assembled from Heart Interface or
>Cole-Hersey would have been over a Grand.
Wow, a grand!
Anyway, I just tried some assorted generic/no name/no spec reed
switches, they were a dollar a bag, at some flea market. With a coil
of 15 turns of 18awg over the reed, it would reliably switch with 1.7
amps. It should be the simplest way to go.