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avidsid(at)yahoo.com
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 Posted: Sat Apr 15, 2006 11:27 am Post subject: newbie with question |
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Would like to have some 12vdc, 15mamp LED indicator lights to show my circuit breakers are working.......how do I put the lights into each circuit off the individual systems without burning the lights out at full battery power or alternator output?
Must be some kind of capacitor or resistor to reduce the power to each light? And if so, how to determine which kind and what size? I will have seven breakers in a row and want the lites over the top of the individual breakers.
Thanking everyone in advance for any assistance to get me up and running..........just joined the aeroelectric forum today.
Hausding, Sid
Avid Speedwing N204S
Alpena, Mi 49707
avidsid(at)yahoo.com
"Why can't we all just get along?"
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fvalarm(at)rapidnet.net
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| Posted: Sat Apr 15, 2006 1:01 pm Post subject: newbie with question |
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Welcome to the group.
Since no one has answered this one yet, I'll take a stab at it.
Put a small (current limiting) resistor in series with the LED. This
arrangement will light the LED whenever the fuse is seeing power (+12V)
i.e.: fuse is in and not blown (assuming of course that the other end of the
circuit is adequately connected to ground.) I wouldn't think the value of
the resistor is critical if using standard low current LEDs. 1000 ohm
(brown, black, red, gold or silver) is common (in my experience) and a good
starting point. The LED is polarity sensitive but not destructive if you
wire it in backwards. So if the circuit doesn't work, try turning the LED
around. Sometimes the LEDs indicate polarity with a flat spot or lead
length. So only proceed with soldering once you figure out the correct
orientation on the test bench.
Good luck.
Worth exactly what you paid for it. Use at your own risk.
Bevan
RV7A finishing kit
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