nuckolls.bob(at)cox.net
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 Posted: Tue Mar 11, 2008 11:50 am Post subject: Plane Power's Friendly Warning Light (Corrected Link) |
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At 08:42 AM 3/11/2008 -0600, you wrote:
<nuckolls.bob(at)cox.net>
At 09:46 PM 3/10/2008 -0700, you wrote:
B&C's flashing warning light is pretty annoying, so I was glad to see Plane
Power's light is a steady, happy glow.
If I recall correctly, the Plane Power warning
light drives from the alternator fail output of
the built-in regulator. While certainly better than
no light, it's not an independent monitor of
alternator/regulator performance.
You might consider a separate LV Warning
system that flashes the light.
Trouble is, it turns out, that the annoying flash is pretty handy when you
really need to see it...no equipment failures to report, just didn't use
the checklist...twice >
Yup, when we crafted that system the flash rate
was set at approx 3 flashes per second. Supposedly
this is the rate most 'irritating', i.e. attention
getting for cockpit warning lamps.
Bill also supplied a 6v lamp for the 14V regulators
to increase intensity of the lamp for sunlight viewability.
So, does anyone have a suggestion as to how to wire a flasher into the PP
light? Can I just use a simple automotive flasher, or do I need something
designed for less current? I want a fairly high (annoying) flash rate.
The simplest method for adding flashing to
an existing lamp circuit is by means of a "two-wire
lamp flasher". There are a number of variations
on the theme. One such circuit is illustrated here:
http://www.aeroelectric.com/Pictures/Schematics/Lamp_Flasher_1.pdf
This circuit should be assembled with a C-Mos
version of the ubiquitous 555 timer. In this
case, the Intersil ICM7555 is called out.
This flasher will deliver a symmetrical ON-OFF
flash pattern at approx 3Hz.
An alternative is shown at:
http://www.aeroelectric.com/Pictures/Schematics/Lamp_Flasher_2.jpg
(was .pdf)
This is built from more generic discrete parts
and can probably be made to do what you want to
accomplish although its not likely to be a
symmetrical pattern.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
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