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From: Glenn Ashmore
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Subject: Re: Need idea for a remote lamp status indicator.
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NNTP-Posting-Date: Thu, 09 Jan 2003 19:38:21 EST
Date: Thu, 09 Jan 2003 19:40:39 -0500
John Fields wrote:
> Are you running a common ground or +12 up the mast, or are you providing
> a separate loop for each lamp?
> How about the current ratings for the different lamps? I remember you
> said the max load was 7 amps, but I don't believe you said whether
> that was for all the lamps or for one particular lamp.
The important ones, navigation markers, anchor and steaming lights are
all 25W 12VDC so we are looking at about 2 amps each and while a maximum
of 3 bulbs will be on one MOSFET, each will have it's own 12V+ wire.
and a common ground wire return. The current sensor (right now I am
leaning towards reed switches) will go on each 12V+ lead.
The spreader lights, for illuminating the deck, are a total of 100W but
are secondary. They don't have to comply with US Coast Guard rules for
Vdrop. It would be nice to have them indicated for completeness but it
is hard to ignore the fact that they are on.
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.
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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