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LED Help please

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Baldrocker:
Powder Keg
Is there some reason why you cant use the led auto lamps listed on
http://www.superbrightleds.com/cgi-bin/store/index.cgi?action=DispPage&Page2Disp=%2F1157.htm
seems a lot easier than messing about with individual leds. I've used them on my car for some
time with no problems.
Just a thought
BR

Powder Keg:
I tend to do things the hard way. I find I learn more that way :doh: Here is what they are going in. http://madmodder.net/index.php?topic=440.15

michvhf:

--- Quote from: Bernd on March 14, 2010, 06:03:12 PM ---Wes,

I found my notes, old as they may be, on figuring out te resistors for an LED. All you'll need to know is what the forward voltage and the amperage is of the LEDs your going to use. To find the wattage of the resistor the formula of amps X volts = watts.

Here's the notes:



Hope this helps.

Bernd

--- End quote ---

That brings back memories.  I used to have that same notebook!  Light blue cover as I recall.  Lots of good info in there.

Bernd:

--- Quote from: michvhf on March 17, 2010, 02:57:40 PM ---
That brings back memories.  I used to have that same notebook!  Light blue cover as I recall.  Lots of good info in there.



--- End quote ---

Mine's a pinckish red color. Maybe they made them in different colors.  :scratch: Have the whole series. Good basic info.

Bernd

John Swift:
Hi Powder Keg
                      If you are still experimenting with led lights
have you tried a constant current supply for  the leds
a 10v chain of leds for example will remain at a constant brightness while the  battery voltage varies from 12 to 16v

a 2n3819 fet with the source and gate terminals joined will limit the current to about 9 mA
into a short circuit or a string of leds adding upto 1 or 2v less than the supply
the maximum volt drop across the fet is 24v , check the dissipation is not more than 200mw

  John

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