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How to wire a LED to a LR3C

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rparigoris

Joined: 24 Nov 2009
Posts: 804

Posted: Thu Jul 29, 2010 9:56 pm Post subject: How to wire a LED to a LR3C

Hi Bob



I have selected a yellow LED to be used with my 12V LR3C.



It came from Pep boys wired with a 680 ohm resistor and works quite well on 12 volts. 



The reason I like it's very bright and doesn't have a flange at the bottom and is longer than normal which allows me to have it extend a little bit from panel which can get my attention even though it is located above my knees because the semiconductor point is in fact in my view.



Question is since 680 ohms is a bit more resistance that I normally use to drop 12 volts to run a yellow LED, does your suggestion of installing two 220 ohm resistors (one in series and one in parallel) hold true for this LED? Or perhaps up the ohms a little?



Thx.

Ron Parigoris

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nuckolls.bob(at)aeroelect
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Posted: Fri Jul 30, 2010 6:12 am Post subject: How to wire a LED to a LR3C

At 12:56 AM 7/30/2010, you wrote:

 	  Quote: 	
		  

<rparigor(at)suffolk.lib.ny.us>



Hi Bob



I have selected a yellow LED to be used with my 12V LR3C.



It came from Pep boys wired with a 680 ohm resistor and works quite 

well on 12 volts.



The reason I like it's very bright and doesn't have a flange at the 

bottom and is longer than normal which allows me to have it extend a 

little bit from panel which can get my attention even though it is 

located above my knees because the semiconductor point is in fact in my view.



Question is since 680 ohms is a bit more resistance that I normally 

use to drop 12 volts to run a yellow LED, does your suggestion of 

installing two 220 ohm resistors (one in series and one in parallel) 

hold true for this LED? Or perhaps up the ohms a little?


	


    If the intensity is okay with the as-supplied

    resistor, just parallel the lamp assembly with

    sufficiently low resistant to prevent a tiny

    bit of glow when the LR3 is NOT flashing the

    light. There's a few milliamps of current flowing

    in a dark lamp on the LR3's lamp driver output

    that won't get any light out of a filament but

    will illuminate an led. You just need to swamp

    out the effects of this bias current to keep

    the led dark.

   Bob . . .

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