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Led Voltage?


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#1 bonneville

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Posted 30 January 2004 - 12:17 AM

i amtrying to do the hdd led mod, i cannont find a 220 resistor, but i found a 5volt led, do i still need a resistor, and if so what is the purpose of the resistor? thanks for your help guys. wink.gif

#2 Himura

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Posted 30 January 2004 - 12:20 AM

to basically lower the voltage and gives a less brighter light.

#3 powercntrl

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Posted 30 January 2004 - 12:49 AM

Resistors don't reduce voltage, they limit current. The problem that LEDs have without a resistor when run at above their rated voltage, is thermal runaway. Basically, as the LED gets hotter, the resistance drops, allowing more current to flow which in turn makes the LED get hotter which causes the resistance to drop which... You get the idea. Pretty soon you have a VERY hot LED that passes all the available current, and depending where you're tapping power from, can be a considerable amount. The end result is an LED that burns out fairly quickly.

Edited by powercntrl, 30 January 2004 - 12:49 AM.


#4 Himura

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Posted 30 January 2004 - 12:57 AM

QUOTE (powercntrl @ Jan 29 2004, 06:49 PM)
Resistors don't reduce voltage, they limit current.

lol yeah, thats what i meant...
just wasnt sure (honestly) sad.gif




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