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user9253
Joined: 28 Mar 2008
Posts: 1930
Location: Riley TWP Michigan
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nuckolls.bob(at)aeroelect
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 Posted: Thu Dec 30, 2021 10:57 am Post subject: Low voltage warning light |
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At 10:44 AM 12/29/2021, you wrote:
These are functional after a fashion. They don't exploit
the performance of a precision (stable) voltage
reference . . . and they don't drive the full
constellation of led/incandescent lamps and/or
digital data ports.
I'm working an upgrade of the original AEC9005
LV warn/battery management module that will use
modern surface mount parts and 'package' by
soldering the board to the solder-cups of a
d-sub connector. Surface mount will greatly
shrink the real estate on the ecb. This will
get us more bare-boards per coupon on the low
cost, fast turn prototype service I use. Makes
the individual boards a lot less expensive.
I should have a sketch of the schematic to
share shortly . . . I'm in the middle of
a fabrication project in the mess-making shop
that needs to get done asap . . . but this
ol' dog needs to sit down and rest the
feet from time to time . . . chance to do
some fun stuff and herd electrons.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
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user9253
Joined: 28 Mar 2008
Posts: 1930
Location: Riley TWP Michigan
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| Posted: Fri Jun 07, 2024 12:47 pm Post subject: Re: Low voltage warning light |
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I made a low voltage warning LED light for the fun of it. I don't need it
because my EFIS has that feature built in. The yellow LED has a narrow
beam, thus it should be mounted so that it is aimed directly towards the
pilot's eyes. The LED does NOT flash, but should get the pilot's attention if
aimed at the pilots eyes. The LED comes on when the voltage drops to
about 13 volts. The voltage of a lead acid battery with a load on it will drop
below 13 within a few seconds of charging system failure. The electronic
components are surface mounted with E-6000 adhesive to a perf board 24 x
44 millimeters. There are no conductors on the other side of the perf board.
So the board can be mounted to a conductive surface if desired. Two pairs of
wires exit the circuit board. One pair of wires needs to be connected to a
fused voltage source. The LED is already connected to the other pair of
wires. The LED can be inserted into a 3/16" hole drilled into the instrument
panel and glued in place with E-6000.
I will give the warning light free of charge to someone who donates to
Matronics. https://matronics.com/contribution/
Oh, and one other condition: After installation, Post a review on the AeroElectric list telling how you like it.
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Joe Gores |
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