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Voltage of the HD/POWER LED headers on mobo? - Page 2

post #11 of 19
Quote:
Originally Posted by kiwiasian;13600909 
This is extremely wrong.

The color of an LED has nothing to do with its voltage.

This is only true if the led comes with a built in series resister. Different color LED's have different voltage drops across them (without any series resister).

(Source Voltage - Voltage drop) / resister = Current needed to turn the LED on.
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post #12 of 19
Quote:
Originally Posted by Blindsay;13607582 
i understand how to wire things in series and parallel, doesnt mean the header can take it though which was my question

I don't see any reason why it wouldn't work if you only wired 2 - 3 LEDs in parallel.
post #13 of 19
Thread Starter 
Quote:
Originally Posted by kiwiasian;13608384 
I don't see any reason why it wouldn't work if you only wired 2 - 3 LEDs in parallel.

without knowing the max amps (or probably milliamps in this case) the header can supply just hooking up more than its rated for could kill it. just like hooking multiple fans to a 3pin header on a mobo
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post #14 of 19
Quote:
Originally Posted by Blindsay;13607582 
i understand how to wire things in series and parallel, doesnt mean the header can take it though which was my question

your best bet would be to contact Asus to see what the header can handle. But I am sure it will be ok since generally, the standard 5mm LED is only 20mA.
    
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post #15 of 19
Quote:
Originally Posted by Sohryu76;13610401 
your best bet would be to contact Asus to see what the header can handle. But I am sure it will be ok since generally, the standard 5mm LED is only 20mA.

This is what I was thinking...most LEDs are 20-25mA.
post #16 of 19
Quote:
Originally Posted by kiwiasian;13611483 
This is what I was thinking...most LEDs are 20-25mA.

at least we agree on something tongue.gif
    
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post #17 of 19
I know this is an old thread but I ran across this while Googling and had to reply for the sake of anybody else that happens upon this thread.

There is a difference in voltages between the different colors of LEDs. Blue and White LEDs require more voltage than red, yellow and orange. Leds are not like light bulbs where the color of the light is determined by the color of the glass. The color depends on the type of semiconductor being used and different semiconductors require different voltages.

And yes I can back that up... http://electronicsclub.info/leds.htm

Also read the part about connecting LEDs in parallel.

Please don't just wildly post assumptions as fact.
post #18 of 19
I know it's an old thread, but just in case someone like me ends up here with the same question,
It turns out it's freaking 5v there... at least with Rampage 4 Extreme and p8z77m-pro on which I checked.
I never had a power led in my case, so recently I added two blue ones in parallel (I thought it's around 3v there, not 5...)
I ended up with WAY TOO bright light, in the dark, it was like a disco... so today I re-routed them to be in sequential so each gets around 2.5v; that gave me about the right brightness I wanted.
So if you only need 1 led you'd need a rather high rated one (4~5v) or use a resistor.
I personally don't think you could damage the board by having two leds in parallel, if there isn't enough current they just would be dimmer than normal. I think 2 in parallel is ok if it's too bright then do sequential.
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post #19 of 19
The colours have different minimum voltages, most Red LED's will power off of 1.8 volts without issue, where as a blue one will not unless otherwise specified, the colour has a fair bit to do with the voltage actually. What Sohryu76 is fairly correct. But it's minimums required to light.
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