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Lighting a single led

post #1 of 5
Thread Starter 
I am working on a case mod that requires me to light 6 individual LEDs of different color. What are my options here?

Can I connect them in parallel to a 4 pin molex (using only two pins) and power straight from PSU? But the spec says only 2.6V max

http://www.xoxide.com/3mm-led-red.html

Or can I connect them in parallel to a two pin connecter and stick to motherboard power led pins?

Any other equivalent product (LED, etc) will be appreciated as well.
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post #2 of 5
you will have to either find an LED that runs on 12v, or get a standard 2.6v LED and get a resistor that brings the voltage down from 12v, to 2.6v.

i tried researching what resistor you need, but it hurt my brain... so thats on you...

but what i did learn is that you can run them in series, so would need just one resistor at the begining of the series, that should be enough for 6 LEDs, also, i found out you can put the resistor on either the positive or negative pole. id put it on positive... thumb.gif
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post #3 of 5
Thread Starter 
I do not see a amp rating. I am going to assume about 10mA. Given that, it seems I will need a 1k Ohm resistor in series, if I want to run them off the PSU. But what about putting all six in parallel to the mobo two pin? Just like you would the power led?
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post #4 of 5
http://led.linear1.org/led.wiz That may give you a hand on designing and what not. Me personally I wouldn't try lighting them from the 2 pins on the motherboard as you don't really have a way know the motherboard's max capabilities. I would just power them off of your power supply. Remember you can use a 12v, 5v, or 3.3v rail to drive your LEDs. With as few as 6 you don't really have much to worry about. A second tip is to not buy from Xioxide as they are really expensive. At most 3mm LEDs should be about 50 cents usually closer to 25 or 30 though.


Edit: Reliable LED source http://www.superbrightleds.com/ <- I've used them quite a bit with no problems.
Edited by Kylepdalton - 1/22/13 at 7:24pm
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post #5 of 5
Thread Starter 
Thanks guys - +rep to you all. I think I got some basic idea now to get going.
Wife's bane
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i5-3570K @ 4.5 Ghz Gigabyte Z77 UD3H HIS R9-290 8 GB Samsung Wonder RAM 
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Crucial SSD for OS Samsung Spinpoint F3 Asus XSPC water block, 360 radiator, and 720 reservo... 
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GPU cooling - XSPC Razer full GPU blocks Win 7 Home Premium Asus PB278Q 2560 X 1440p ISP Logitech G15 
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Wife's bane
(17 items)
 
  
CPUMotherboardGraphicsRAM
i5-3570K @ 4.5 Ghz Gigabyte Z77 UD3H HIS R9-290 8 GB Samsung Wonder RAM 
Hard DriveHard DriveOptical DriveCooling
Crucial SSD for OS Samsung Spinpoint F3 Asus XSPC water block, 360 radiator, and 720 reservo... 
CoolingOSMonitorKeyboard
GPU cooling - XSPC Razer full GPU blocks Win 7 Home Premium Asus PB278Q 2560 X 1440p ISP Logitech G15 
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