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Control case fan LED on/off separately from speed

post #1 of 9
Thread Starter 
Hi all,

I know this question has come up before, but it seems like it's never really been seen through to the end. What I want is to hook up multiple case fans (all with LEDs) to a fan controller to control the RPM, and wire their individual LEDs to switches (like these) so that I can turn off the LEDs if I'm watching a movie or want darkness or something.

Cases that come pre-installed with controllable LED fans tend to have those fans wired perfectly for this - 3-pin power connector, 2-pin LED connector. Can't seem to find anywhere that sells those fans individually though...

Closest I've come to a solution is the BitFenix Spectre fans which include a jumper (pictured below) to turn the LED on/off.




My question is, would I be able to somehow introduce a simple switch into that jumper circuit and be able to flip the switch to turn the LED on/off?
post #2 of 9
Quote:
Originally Posted by nickf77 View Post

Hi all,

I know this question has come up before, but it seems like it's never really been seen through to the end. What I want is to hook up multiple case fans (all with LEDs) to a fan controller to control the RPM, and wire their individual LEDs to switches (like these) so that I can turn off the LEDs if I'm watching a movie or want darkness or something.

Cases that come pre-installed with controllable LED fans tend to have those fans wired perfectly for this - 3-pin power connector, 2-pin LED connector. Can't seem to find anywhere that sells those fans individually though...

Closest I've come to a solution is the BitFenix Spectre fans which include a jumper (pictured below) to turn the LED on/off.




My question is, would I be able to somehow introduce a simple switch into that jumper circuit and be able to flip the switch to turn the LED on/off?

If you are planning on LED modding the fans yourself you can do something like this:

the fan is always connected to both + and - (GND), while the LED's are only connected to - (GND) if the switch is in the ON position, when the led's are not connected to ground the lec-circuit is not complete and so the led's will not emit light.
post #3 of 9
Thread Starter 
Electrical circuits were never my forte, is this a practical version of that wiring diagram?

Excuse the crude drawing...

post #4 of 9
Quote:
Originally Posted by nickf77 View Post

Electrical circuits were never my forte, is this a practical version of that wiring diagram?

Excuse the crude drawing...


I somewhat disagree with that beeing the practical version tongue.gif, but the two diagrams/schematics are in practice the same. thumb.gif

So if you do that it should work without proplems.
post #5 of 9
Thread Starter 
Quote:
Originally Posted by Latrakx View Post

I somewhat disagree with that beeing the practical version tongue.gif, but the two diagrams/schematics are in practice the same. thumb.gif

So if you do that it should work without proplems.

Gotcha. One more thing - How should I know which side of that little jumper wire should be connected to the - terminal on the switch and which should be connected to the positive?
post #6 of 9
Quote:
Originally Posted by nickf77 View Post

Gotcha. One more thing - How should I know which side of that little jumper wire should be connected to the - terminal on the switch and which should be connected to the positive?

The best thing with switches is that polarity (+ and -) does not matter. It simply connects two points (or disconnect two points), so there's no + and - terminal on the switch.
post #7 of 9
Thread Starter 
Apologies for the electricity lesson here, but what about for switches that light up? Something like this has a third ACC pin. Where would be the most practical place for that to hook up?

I assume it's so that the switch can draw its own power to light up its LED.
post #8 of 9
Quote:
Originally Posted by nickf77 View Post

Apologies for the electricity lesson here, but what about for switches that light up? Something like this has a third ACC pin. Where would be the most practical place for that to hook up?

I assume it's so that the switch can draw its own power to light up its LED.

Generally the LED will draw power from the third pin while the third pin is only connected to ground when in the on position, so [ Switch in on positon: pin 1 and 2 (1 and ground) is connected to each other just like any other switch, and the LED is connected to a power-source and ground so it is emitting light. Switch in off position: pin 1 and 2 is not connected and the LED is not connected to ground (or power) so the led circuit is not complete and so the LED is not emitting light. At least that's my understanding of it, I don't have that much experience with LED-switches though so I might be wrong tongue.gif .
post #9 of 9
Thread Starter 
Oops, never got the reply notification email... I got the switches and hooked them up to the jumpers (one end to POWER terminal and the other to ACC terminal) and they're working perfectly. I'll ditch the LED usage because I think it's looking for a 12v source and the current running through the switch from the fan LED is probably like 3v or something.
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