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How to power small LEDs? - Page 2

post #11 of 22
Most common are 3 volt, you can get 12 volt ones but expensive, put 4 in a series by connecting pos+ (long lead) to neg-(short lead) leaving a pos at one end and a neg at the other they can then be connected to the yellow and black of a molex. You can run them singly off 12 volts by using a 470k resistor on the pos side of the LED.
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post #12 of 22
use this: http://led.linear1.org/led.wiz

It is recommended that you resistors to limit current. Otherwise, if one bulb goes out... all the other ones will pop. I've done it.
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post #13 of 22
Heres a superbrite blue light box I made, throws quite a bit of light.
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post #14 of 22
I've played with LEDS abunch before but wiring them in a car. Should be the same though, 12V. What I did was i used three 3.3V led's, and calculated out the desired amperage i wanted through them (15 miliamps) and figured out the formula

V=IR
Voltage = 12V - 3.3v * 3 (3 of them in a series) = 2.1V
I = 0.015amps

R = 2.1 / 0.015
R = 140ohms

So i attached a 140ish ohm (they didnt make 140 i think i ended up with a 155 or something) and soldered them as

Resistor --> positive of first led --> negative of first soldered to positive of second --> negative of 2nd soldered to positive of third.

And then just wired it directly to the 12v power (car battery) and also put a switch in, they worked perfectly fine and are pretty bright.

(Don't know if this helps or not but hope it does)
post #15 of 22
look for the LED's on the sticky paper...they are rated for 7v nominal use, 9v max. I use them in all my rigs and solder leads to run off of a trimmer, giving 7-12v! Those puppies really shine at 12v and surprisingly stay cool too! I tested them out for 3 months before putting them in a rig and running them off the PSU.
In 3 months, not one LED burned up or changed color and that was from 24/7 use. I have four in my xgamer case now...dimmable..of course.

*I'll see if I can snap a pic of a pair for you.
post #16 of 22
Quote:
Originally Posted by CL3P20 View Post
look for the LED's on the sticky paper...they are rated for 7v nominal use, 9v max. I use them in all my rigs and solder leads to run off of a trimmer, giving 7-12v! Those puppies really shine at 12v and surprisingly stay cool too! I tested them out for 3 months before putting them in a rig and running them off the PSU.
In 3 months, not one LED burned up or changed color and that was from 24/7 use. I have four in my xgamer case now...dimmable..of course.

*I'll see if I can snap a pic of a pair for you.
Thats the beauty of LED's. They basically last forever. What sort of resistor did you have in there though?
post #17 of 22
Thread Starter 
Another idea, what about using the mobo headers for status LED's? IF you were lighting up an obvious part of the system it would blink to show when it's busy. kinda cool (in theory anyways)
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post #18 of 22
Looking for UV LED's, anyone know where to find them?
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post #19 of 22
Quote:
Originally Posted by Znth View Post
Another idea, what about using the mobo headers for status LED's? IF you were lighting up an obvious part of the system it would blink to show when it's busy. kinda cool (in theory anyways)
Which mobo header? There two headers already designed for LEDs (PWR_ON and HD_ACTIVITY). They are 3.3v output and are perfect for powering one LED since this is what they are suppose to do. You should be able to use a fan header. To power LEDs as well since they are varying 12v. Be careful of power consumption and not to blow a header.


Quote:
Originally Posted by Burn View Post
Looking for UV LED's, anyone know where to find them?
eBay has 20 for $5 shipped: http://business.search.ebay.com/uv-l...0QQsacatZ12576
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post #20 of 22
I use recycled USB gamepad/mouse cables for external illumination/animation of my twisted McFarlane collectibles......flashing eyes, beating hearts etc.
  
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