Perry Mick wrote:
Tracy Crook wrote:
BTW, it is nuts to fly one of these "electric airplanes" without an
alarm to warn of alternator failure.
Perry Mick wrote:
Agreed. I have a three led voltage monitor right in front of me, red,
yellow, green. I also have a big red light and audio alarm if my
alternator
quits. Probably won't hear the audio alarm in the air with the engine
noise and headset on, but it works really well on the ground to remind
you to turn your master switch off.
lonwood wrote:
Perry, could you share with us how you rigged up your warning light system,
including schematics and warning light part numbers.
Perry Mick wrote:
Have you been on the list very long Lon? Paul sent out a zip file
a couple months ago with six pages of schematics of my whole EFI
system. Included is a page with the voltage monitor, just a simple
quad comparator driving red, yellow, and green LEDs. For voltage
warning, caution, and ok respectively. The audio alarm is the
"low coolant" input to the stock RX7 instrument panel, rewired for
alternator failure. The FET doesn't have to be the one shown, about
any N-channel International Rectifier HEXFET will work. I see the
red light for alternator failure is not shown, but if I remember
correctly, it is just an incandescent light I got at Radio Shack,
wired between battery +12V and the signal ALTFAIL. If the alternator
is working correctly, ALTFAIL is 12V and the light is not on.
Attached are the four pages pertinent to your question.
--
Perry J. Mick
Mick Duckt N7XR
http://www.ductedfan.com
Perry what kind of gifs are those? Do you use a Mac? What ever they are I had to
delete
them as they brought my computer to dead stop. I tried saving them to a file on the
disk but that did not work either. I got a malloc error.
Check the file size and never send me more than 200K or so in one message.
I don't have a T1 line or DSL. You could try sending one at a time.
Paul Lamar
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