Fan Modding - Adding LEDs?

PhillyDee · 30 Dec 2009 at 17:27

You could use the same for both, but 50 ohms would obviously only be half way on the 120Ohm lights!

Silenced · 30 Dec 2009 at 17:48

PhillyDee said:
If you google LED calculator then it will work out the lot for you.
I would set source to 3.6V and set led voltage to 0.5. You must use a resistor so the maximum voltage it can give you is 3.6V.

It works out at 120 Ohms

So with this one which Pot can I put onto it? Would a 100 Ohm one be fine?

Silenced · 30 Dec 2009 at 18:31

Hm it seems a problem has occurred, if the forward voltage drop is 3.6 V to power the Blue and the Green sections of light for 4 sets of LEDs. Thats 14.4V to power one set of Blue or Green lights in parallel? Which means it's 28.8V for the Blue and the Green and it's 38.4V when the red is added in. Or is this wrong?

D D Danneh · 30 Dec 2009 at 18:42

No, in a parallel circuit you get equal voltage across each branch, its the current that divides between branches.

So I assume if you wanted to run 4 LED's in parallel with 3.6V and 50mA each, the source would have to be 3.6V and 200mA. Don't take my word for it though, I'm crap with electronics.

Silenced · 30 Dec 2009 at 19:49

D D Danneh said:
No, in a parallel circuit you get equal voltage across each branch, its the current that divides between branches.

So I assume if you wanted to run 4 LED's in parallel with 3.6V and 50mA each, the source would have to be 3.6V and 200mA. Don't take my word for it though, I'm crap with electronics.

That sounds good for me, could someone just make sure thats right if you're crap at electronics

(No offence)

Also, I've found some lower power LEDs, I have found I will need a 100Ohm resistor for the red light and 82Ohm resistor for the Blue and Green, I cannot buy 82Ohm resistors from the places I see, would a 100Ohm resistor be fine?

And after I put the 100Ohm resistor in would I put a 100Ohm pot to adjust from full brightness to 0?