Resistor Value for L.E.D.’s

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calee4nyaboy

Copper - Posts: 55

Joined: June 25, 2003

Location: United States

Posted: December 14, 2004 at 9:44 AM / IP Logged

Hi,

Quick question: I have a bunch of 3 volt LED's and want to run them in my car. I have been told that all you do is attach a resistor onto the leg of each one to get it to work in 12 volt applications.

What resistor value do you use?

Thanks!

John

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QuagmireMan

Member - Posts: 25

Joined: November 18, 2002

Location: United States

Posted: December 14, 2004 at 10:26 PM / IP Logged

connect them in series of 4. then you dont have to waste the time with resistors.

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calee4nyaboy

Copper - Posts: 55

Joined: June 25, 2003

Location: United States

Posted: December 14, 2004 at 10:45 PM / IP Logged

yes, you could do 4 in series with no resistor (assuming they are 4 volt LED's)

I found an excellent page on this that answers the question with the equations needed:

http://www.kpsec.freeuk.com/components/led.htm

yippee!

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Resistor Value for L.E.D.’s

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