LED Lights on computer

[lumitoid]

Can someone help me with this. I am trying to figure what the voltage for a computer Hard Drive and Power on LED is. Thanks

[Changchung]

This output have like 1.8 volts, if you want to put in your case highbrignest leds you have to do something like that...

http://metku.net/index.html?sect=vie...eyez/index_eng

[Zelandeth]

I've found that the actual voltage varies quite a bit from system to system. The old IBM system I used to run could barely light a blue LED on the power light, but it worked fine for the network, IDE and SCSI indicators. Works fine for both of the lights on this PC too.

I'd just plug it in and see how well it works before going and looking for additional circuits. Most modern high brightness LED's will work more than bright enough for the purpose with only a couple of mA of current. Case would no doubt be different if you're talking about Luxeons, as you'll be needing far more current than the indicator light circuit on the PC's motherboard will be able to supply.

[lumitoid]

Thanks for your help guys, I got a 2 to 4 volt led from rat shack and it worked great for a hd drive light. Thanks again

[ROVER]

What I do is just put a bright LED wherever I need it, and then instead of using the lower voltage wires that fed the old dim led, just tap into the wires coming off the power supply. You can use the 5 volt wires and just use a little resistor. The power supply wires should be labeled 2, 5, and 10 or 12 volts I think.

[The_LED_Museum]

On all computer PSUs I've come across, they output +5, -5, +12, and -12 volts.
Use the +5 volt line and a small resistor (82 ohms for violet, blue, aqua, pure green, and white; or 150 ohms for red, orange, yellow, and yellow-green would ensure the LED receives ~20mA) to make these connections.