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Easy LED solution?

post #1 of 6
Thread Starter 
Hey everyone, I'm looking for a easy LED setup. Please try to avoid all the tech terms as I've read through a few posts and It's just not clicking.

Anyways, I have a bunch of http://www.directron.com/ledred.html

Is there a way to connect them to my system without anything fancy or needing to create something?

I was wanting to add 4, two top, two bottom. I currently have alot of LED's built into My 200mm top exhaust fan, 200m front intake fan, and 2 built into the Memory fan. I wanted to add these to fill in the dark area's and add a bit more flavor to my rig.

I thought it was a simple task, I seem to have underestimated LED installation..lol!
post #2 of 6
I'm not even sure where to start. there are betters ways to go about adding more light and flavor. Those are meant to plug in the mother board for hard activity and power lights.
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Core 2 Haf
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post #3 of 6
I get leds from WWW.oznium.com
Case Labs th10
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Case Labs th10
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post #4 of 6
Pass, Ill let you guys handle this one for now.

I would suggest using better led's or a cathode if I were you though. ( see I helped a little )
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post #5 of 6
Thread Starter 
Ah, yea I guess I picked up the wrong type. That's a mistake I'll never make again. I'll look into that site. Thanks for the link.
post #6 of 6
Wiring up your own LEDs isn't that hard at all. The resistor size calculations are straightforward (and there is even a web-based wizard on LEDlinear) based on Ohm's Law (V=IR) and the power law (P=VI); and the soldering is pretty easy as well. Often the hardest part is finding the specs for the LEDs (used for calculating the resistor size); especially when ordering LEDs from ebay or a PC mod store, since they often don't list all the important specs and don't link to the datasheet. Basic rule I follow is I don't buy unless they list the full specs, have the datasheet, or list the manufacturer's part number with which I can find a datasheet; this applies not just to LEDs but all kinds of products (electronic devices, computer hardware, gears, power tools, etc.)



Here's a simple example of resistor size calculations:
Assume we want to power 4 LEDs in series from the 12V rail of the PSU; the LEDs are rated for a forward voltage of 2.1V and a forward current of 20mA (very common spec)
So...
Vf = Voltage drop across LED = 2.1V
If = Current through LED= 20mA = 0.02A
Vs = Supply Voltage = 12V

Now the necessary voltage drop across the resistor
Vr = Vs - n * Vf = 12V - 4 * 2.1V = 3.6V
Where, n = number of LEDs in series

Note, the current through elements in series is always constant
Ir = Current through resistor = If = 0.02A

Using Ohm's Law (V = I * R) we get the necessary (or desired) resistance
Rd = Vr / Ir = 3.6V / 0.02A = 180 Ohm
to get the actual resistance we round up to the nearest standard size resistor; 180 Ohm is a standard size, so we don't need to round

Ra = Actual resistance used = 180 Ohm

Now compute the minimum power rating of the resistor from the power law (P = V * I)
Note, for resistors P = V * I = I^2 * R
Pd = Ir^2 * Ra = 0.02A^2 * 180 Ohm = 0.072W
We can use any 180 Ohm resistor rated for 0.072W or higher; so we'll use a 180 Ohm 1/8W resistor.
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RAD GT
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