Adding more fans onto a case speed/led header.

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WhereisPerry

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Nov 26, 2013
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I recently purchased the TT V71 (love it) and I would like to add a few more fans to this. The twist is I would like to be able to control the LEDs on the fans with the cases' header. Its powered by a molex cable but only has two 3pin slots. One already has a splitter for the two front fans. Do I have any options?
 
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Karadjgne
I have cm 690 II case, it has a switch for the led fan. It breaks the power connection between the source and the leds, so the led itself never sees any voltage, but doesn't interfere with the source to the fan (same source, 3pin fan, voltage regulated, so lowering voltage to the fan also dims the leds as well as slowing the fan down) . An led is no different than a light bulb in this respect. No power = no light.
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WhereisPerry

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its not the speed im worried about, i would just like to turn the LEDs off/on when im watching a movie at night
 
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Karadjgne

Karadjgne

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Depends on the leds. Some have external wires that you can break into and hook to any switch. Some have internal wiring in the hub, so you'd have to do some fancy solder work to add wiring that could then be switched. You'd have to break the wire going from the voltage connection to before the first diode if series or break all if parallel, setup wires to allow voltage switch, but not interfere with fan voltage. It's a pita, but doable.
 
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Karadjgne

Karadjgne

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Dec 26, 2012
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I have cm 690 II case, it has a switch for the led fan. It breaks the power connection between the source and the leds, so the led itself never sees any voltage, but doesn't interfere with the source to the fan (same source, 3pin fan, voltage regulated, so lowering voltage to the fan also dims the leds as well as slowing the fan down) . An led is no different than a light bulb in this respect. No power = no light.
 
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WhereisPerry

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Nov 26, 2013
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i meant to post about this the other day but i suppose now is as good as ever. when i removed some of the sticker on the back of the fans i noticed that the fans that came with the case have 4 possible points of connection for a wire. going....Negative(black wire) Positive(Red) "Y"(no wire connected) and LED(yellow). Now, i also have a store bought fan, same brand and size, that goes Negative(black) Positive(red) and then "Y"(yellow)
what would be the reasoning behind this?
 
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