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How to make a fan controller

post #1 of 3
Thread Starter 
Hi,
I want to make a fan controller for my 120mm fan, and I'm just wondering how to go about it.
Obviously I need a variable resistor / potentiometer between the 4-pin power supply molex and the fan, but how do I wire it all, and what value resistor would need to be used?

Is there a resource somewhere about doing this?

It would be nice if I could have a display at the front as well as the fan control knob saying the percentage of power the fan is receiving, but this may be going to far.

Thanks
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No thrills keyboard Thermaltake 430W Usicase miditower Logitech G5 
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post #2 of 3
The display is taking it a bit to far,but a 5 Watt 100 Ohm rheostat will do the job without a loss of performance. No resistor,a rheostat/potentiometer is a variable resistor.

You would connect the 12v wire to the far left pin and the ground to the middle pin usually.

An lcd readout is taking it a bit too far,but if its what you want you can purchase fan controllers with lcd readouts for sub $30.
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CPUMotherboardOSKeyboard
AMD Athlon Xp2900 Abit Nf7 Xandros/XP Home Z-Board 
PowerCaseMouse
Antec SmartPower 500W Elegance X-Raider+Ratpadz 
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post #3 of 3
Thread Starter 
Ok, thanks very much for your quick response.
I should have mentioned this before, but the fan is a Sunon 120mm,
0.57A, 6.8 Watt. Would I need a different kind of potentiometer for this fan, as it uses a bit of power, or would a 5W, 100 Ohm one do the trick?

The display isn't really important, so I agree, it's not worth the effort or money. I suppose I would need a micocontroller for it, or something similar.
My System
(13 items)
 
  
CPUMotherboardOSMonitor
P4 3.2C A-bit IC7-G Windows XP IBM P275 21" CRT 
KeyboardPowerCaseMouse
No thrills keyboard Thermaltake 430W Usicase miditower Logitech G5 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardOSMonitor
P4 3.2C A-bit IC7-G Windows XP IBM P275 21" CRT 
KeyboardPowerCaseMouse
No thrills keyboard Thermaltake 430W Usicase miditower Logitech G5 
  hide details  
Reply
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