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Old 11-19-2006, 07:00 PM   #1 (permalink)
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Brass and Wood Fan
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Computer fan, specific need, where to?

Hiya!

I need a new fan for my liquid cooling system's radiator. One that satisfies the following requisites:

* 3-pin! Black, red, and yellow. No molex! It needs to plug into the Mobo.
* LED
* Variable RPMs.
* The highest RPM fan possible, satisfying the above req's.

I can't find any above 2400rpm. Any luck, fellow modders?
Thanks!
-Steve
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Old 11-19-2006, 07:13 PM   #2 (permalink)
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Couple things, if you really want the best option for modding..

1 pin is +12v, one is ground, one is signal (rpm). Apply that to a molex connector, and run the signal pin to the correct one on the mobo. That will let you monitor the RPM and also use just about any fan. Honestly, i wouldnt care to see what the rpm is, unless you are afraid of it quitting on you.

variable speed it ieay, just get a variable resistor from radioshack and put it in series. That's how I control the speed on my internal casefan, and the 2 fans on my watercooling case. Check out coolerguys.com for lots of hardware deals.
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Old 11-19-2006, 07:39 PM   #3 (permalink)
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All Electronics has quite a few fans available cheap. www.allelectronics.com

I've always found that a pulse width modulator circuit works well for controlling the speed of fans and motors. You can google that and find a ton of designs, or just buy a simple hobby kit with all the parts. You could very easily substitute a thermistor instead of a pot in the circuit if so so wish.
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