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5mm LEDs!!! (changes to high power)

post #1 of 17
Thread Starter 
is there a way to power the 5mm LEDs without resistors and straight from the mobo or PSU?

im planning to use 4 one watt LEDs on my computer case i'll post pics once im done.
Edited by Coolwaters - 5/22/08 at 11:55pm
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post #2 of 17
yes and is it for a fan controler?
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post #3 of 17
If your running them from a PSU then yeh, you will more than likely need a resistor.

What rating are the LEDs you have there?
    
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post #4 of 17
Thread Starter 
it says 3.5-4v at 20mA. their bare 5mm LEDs.

is there a way to run them with out resistors? isnt there a regulator?
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post #5 of 17
Quote:
Originally Posted by Coolwaters View Post
it says 3.5-4v at 20mA. their bare 5mm LEDs.

is there a way to run them with out resistors? isnt there a regulator?
no you need the reistor.
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post #6 of 17
A diode acts like a short circuit when turned on. It will use all the current that it can draw for as long as it is on. The PSU will limit what it supplies, but it is still much, much, more than you want. The LED will blow out immediately
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post #7 of 17
could always get a potentiometer and run them off that a 5k would be more than enough and you could adjust it for the right volts/amps instead of adding more than one resistor
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post #8 of 17
Thread Starter 
dam it never mind i'll just install my high power LEDs...
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post #9 of 17
3 of them in series will be OK since the voltage drop across each is 3.5-4v.

Isnt that right?
    
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post #10 of 17
Quote:
Originally Posted by KinZee View Post
3 of them in series will be OK since the voltage drop across each is 3.5-4v.

Isnt that right?
Yes, but it will still draw all available current and burn out almost immediately without a resistor
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