L.E.D. Resistance Value
Thread Starter
Pro
Joined: Aug 2005
Posts: 642
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From: Center Line MI
L.E.D. Resistance Value
I have a high intensity L.e.d. that require a 470 ohm resistor to run on 12 volts D.C.. If I start running more than one l.e.d. with one resistor I lose intensity.I tried to reduce the resistance and this resulted in the LED's dimming and not getting brighter......
I think I have my train of thought back words do I have to increase my value?????
I am trying to run 18 LED's off of one resistor.....I no ohm's law comes into play but electronics class was a long time ago.
Can someone help me with the formula that would apply....
And do it for me...
Thanks in advance...
I think I have my train of thought back words do I have to increase my value?????
I am trying to run 18 LED's off of one resistor.....I no ohm's law comes into play but electronics class was a long time ago.
Can someone help me with the formula that would apply....
And do it for me...
Thanks in advance...
Instructor
Joined: Jan 2006
Posts: 240
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From: St Louis MO
Burning Brakes
Joined: May 2003
Posts: 822
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From: College Station TX
be careful, when you over power they start to dim and never go back to being bright again
12.0 volts-2.0 volts=10volts
10volts/.02amps=500ohm resistor~or what you said 470
you want 2 LED's:
12.0-4.0=8
8/.04=200ohm resistor for 2 LED's
12.0 volts-2.0 volts=10volts
10volts/.02amps=500ohm resistor~or what you said 470
you want 2 LED's:
12.0-4.0=8
8/.04=200ohm resistor for 2 LED's
Former Vendor
Joined: Nov 2005
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From: Murfreesboro, TN. "I'm like a kid in a candy store everytime I see a Corvette!!"
I typically just solder in one resistor per LED as they are cheap to buy, and when soldering them in line an heat shrinked, they are still very inobtrusive...
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