nuckollsr(at)cox.net Guest
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Posted: Tue Jan 03, 2006 5:36 am Post subject: Re: Accessory load monitoring |
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At 11:19 PM 1/1/2006 -0500, you wrote:
Howdy A-list!
I know this is nothing electric, but that's part of what makes it so cool.
It worked out so well I just thought I'd share with the rest of y'all!
http://websites.expercraft.com/n51pw/index.php?q=log entry&log id=7883
Click on the fotos for a better view and >>Next Entry>> to the next two pages
for the "how-to". Lemme know if ya got any ?s.
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Pretty neat . . . and imaginative! Thanks for sharing this.
There are some electronic ways to detect electrical integrity
of various loads too. One of the simplest is illustrated at:
http://www.aeroelectric.com/Pictures/Misc/CurrentSense.jpg
You can buy the contact capsule for a reed relay or
switch from various sources. I believe Radio Shack
sells them still. It takes some experimentation to size
the excitation coil with the load. It takes more turns
to detect say a 2A nav light than it does to monitor
a 100W landing light or pitot tube.
A schematic of an exemplar installation is shown at:
http://www.aeroelectric.com/PPS/DeIce/Pitot Heat.pdf
This technique is used in many of our TC aircraft to
make sure that when an accessory is ON, that it is also
drawing current. We use them on pitot heaters and electric
windshields. They could just as easily be applied to any
remotely located but not easily observed load like light
bulbs. Many automobiles use electronic voltage/current
detectors to warn drivers of burned out lamps. At one
time I considered an article on applying one of the modern
voltage/load detector chips . . . but abandoned the idea
in favor of the reed relay technique. The chip was
pretty neat but required some etched circuit boards
and assembly techniques not common to the OBAM aircraft
builder's stock and trade. The custom reed relays are
simple and just as effective.
Sometimes the best way to drive a nail is with a hammer.
Bob . . .
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