Re: [Amc-list] Blue LED tamed

[Wrambler242@xxxxxxxxxxx]

Yes, it's a freaking laser!
To make matters worse the local Radioshack doesn't carry anything so mundane as the needed resisitors. I'll have to either order some online or use something else.
Did you use the 15k on top of the one already soldered in place or alone?
As I mentioned mine was overheated and the resistor they soldered in fell apart. I'd have sent it back ,but it's a $2 piece.
  Why they used such a bright led for an indicator light is anyones guess, but it was definitely a poor choice.

--
Mark Price
Morgantown, WV
1969 AMC Rambler, 4.0L, EFI, T-5

 -------------- Original message ----------------------
From: "Widiker, John D" <john.widiker@xxxxxxx>
> This Blue LED is not a tiny cute one, it's a freaking laser, it's burn
> your retinas bright, 200 did absolutely nothing at all. The same one he
> has we used 15K on and it was tolerable and hasn't had an issue in 3
> weeks of use. 
> 
> ~J
> 
> -----Original Message-----
> From: amc-list-bounces@xxxxxxxxxxxx
> [mailto:amc-list-bounces@xxxxxxxxxxxx] On Behalf Of Tom Jennings
> Sent: Sunday, March 04, 2007 4:37 PM
> To: AMC/Rambler owners, drivers and fans.
> Subject: Re: [Amc-list] Blue LED tamed
> 
> On Sat, 3 Mar 2007, Widiker, John D wrote:
> 
> > Subject: [Amc-list] Blue LED tamed
> 
> > Tell the person at radio shack you want a 15K (1/4 watt) power 
> > limiting resister,
> 
> 15K is too big!
> 
> The resistor is to limit the current through the LED. You need to know
> the rated "forward current" for the LED, but nearly all small-ish LEDs
> want 20 to 40 milliamps max. More than that they may get brighter, but
> their life will drop DRAMATICALLY!! Use more LEDs if you want more
> light.
> 
> When on, blue LEDs drop about 3 volts across them (this is a constant).
> For a typical small blue LED, 20 mils of current, you would use a 470
> ohm resistor; for a 40 milliamp LED, half that; 220 ohms. (Resistors
> come only in standard values, you won't normally find a 500 ohm
> resistor.)
> 
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