What is the potential diffrence (voltage) out of the motherboard header for your

You're not going to solder anything to it I trust?

Touch a multimeter to it while the board is on. LEDs work to fairly specific voltages, but it varies with colour and possibly with other things as well. Digital voltmeter is definitely the reliable option.
 
It probably depends on the LED it's wired too, I guess it probably uses a current limited output. As said, a multimeter will give you your answer...
 
JonJ678 said:
You're not going to solder anything to it I trust?

Touch a multimeter to it while the board is on. LEDs work to fairly specific voltages, but it varies with colour and possibly with other things as well. Digital voltmeter is definitely the reliable option.
Click to expand...

well of course i was - just wondering if there was enough potential diffrence for a 555 interfaced with a 4017b ?
 
MikeHunt79 said:
It probably depends on the LED it's wired too, I guess it probably uses a current limited output. As said, a multimeter will give you your answer...
Click to expand...

sweet i can get my hands on one of them :) :D just it's not the mobo i will be usin in the long run is it standardised?

thanks
 
I think it's fully same as for HDD LED because cases use commonly quite identical LEDs for those and I measured voltage when building circuitry for controlling HDD LED from both motherboard (Asus P5Q) and 3ware RAID controller.
At idle anode pin was at ~5V and cathode pin at ~3.1V.
During access anode was at ~2.9V and cathode at ~1V.
(without LED as load readings don't make sense)
 
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