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Adding LEDs to Power Supply

post #1 of 10
Thread Starter 
Ok I have a Cooler Master 650W power supply that came with my Haf 922 http://www.newegg.com/Product/Product.aspx?Item=N82E16817171052
I am wanting to add 4 red LEDs to it
How can I do this . i do know how to solder.
     
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post #2 of 10
how did you want them to shine out of the PSU? the easiest way would be to jump them off one of the 12 volt rails and just put a 320ohm resistor on them and then hot glue them to a part of the inside of the PSU.

*Be careful as the capacitors in a PSU hold a pretty painful charge even when not plugged into mains power*
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post #3 of 10
you will need to know the forward voltage and forward current of the LEDs. If this is unknown, and they are not superbright LEDs, its safe to assume 2.2V forward voltage, and a 20mA forward current.

basically you will be able to connect them in series, and have a resistor in series too, then connected to 12V.


so the basic setup will be :-
260

To work out the required resistor - the basic equation is Vsupply - Vled / Iled

in this case, because we have 4 LED's the equation will be :-

Vsupply - Vled1 - Vled2 -Vled3 - Vled4
_____________________________
Iled (in Amps)

(because the LEDs are in series, the current will be the same through each one. If you have different current LED's, you ALWAYS pick the lowest current for this equation)

in your case (assuming 2.2 Forward voltage, and 20mA forward current (or 0.020A)

12V - 2.2v - 2.2v - 2.2v - 2.2v
______________________
0.020

= 3.2V / 0.020
= 160ohms

so you would need a 160ohm resistor in that case. if the LED forward voltage or forward current is different, you need to do the sums again with the new values. LED's usually specify a MAX forward current, and its good practice to go under this (in case of spikes etc) so if the MAX is 30mA, set the circuit at 25mA, to give some headroom. sometimes you can not get the exact resistor - its better going up than down in value, as this brings the current down a little. sometimes you can get away with going slightly down in value. :-)

If you connect without a limiting resistor, there is a good chance it will pop the LED's.

Also you need to make sure you wire the LED's the right way. Anode goes towards the positive, cathode to the negative. Most round case LEDS have a "flat-spot" nearest the cathode lead on the case. (see here.)

As for finding the 12v and 0V in the PSU, just follow the yellow (12V) and black (0V) wires. :-) A multimeter will confirm the 12V supply.

hope that helps.

Lesley x
post #4 of 10
Thread Starter 
Quote:
Originally Posted by latelesley View Post

you will need to know the forward voltage and forward current of the LEDs. If this is unknown, and they are not superbright LEDs, its safe to assume 2.2V forward voltage, and a 20mA forward current.

If I am told that the forward Voltage is 3.5V and amp is 30mA do i need a resistor at all? they should all light up just not as bright right?
     
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post #5 of 10
hmmm that may not be a good idea. You might find they may not light, due to the PSU not being above the forward voltage of all the LEDs. TBH, I've never tried it with LEDs, I've always had to use resistors. What you could do is two lots of two LEDs, instead of one chain of 4.
So you would have 12v - resistor - led - led - 0V

setting the current at 25mA (for safety)

12 -3.5 -3.5
_________

0.025

= 200 ohms

I think the nearest standard value is 180ohm, or 220ohm. 180ohm will be slightly brighter, and should be ok. with a 180 ohm resistor the power can go up to 12.4V before it reaches 30mA, with the 220ohm it can go up to 13.6V. I suppose it depends on what the 12V rail is running at, you can check with a multimeter and then decide whether the 180ohm is too close to the limit or not. If it is, go with the 220ohm.

hope that helps. :-)
post #6 of 10
Quote:
Originally Posted by latelesley View Post

hmmm that may not be a good idea.
Agreed, you should always use a resister with LEDs.
    
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post #7 of 10
Thread Starter 
hey thanks smile.gif should be fun. +rep for helping me out
     
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post #8 of 10
I simply used a few 12v leds(prewired) offa ebay for the Katharos Mod, ran them all from the same source pos to pos neg to neg (12v rail) worked out fine. But as everyone has said, be careful.

450
post #9 of 10
Thread Starter 
Quote:
Originally Posted by Lutro0 View Post

I simply used a few 12v leds(prewired) offa ebay for the Katharos Mod, ran them all from the same source pos to pos neg to neg (12v rail) worked out fine. But as everyone has said, be careful.
450

Wait..... I could just replace the fan with one that has LEDs........ ? O.o


EDIT also looking at your work there has made you one of my modding heroes. will be looking at your process if I ever do a PSU similar to that.
Edited by remnant - 3/24/12 at 12:12am
     
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post #10 of 10
Quote:
Originally Posted by remnant View Post

Wait..... I could just replace the fan with one that has LEDs........ ? O.o
EDIT also looking at your work there has made you one of my modding heroes. will be looking at your process if I ever do a PSU similar to that.

I appreciate your very kind words bud. If you ever need any help let me know.
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