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Variable speed fan

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Darkraist

Guest
Its not that hard, just get a rheostat at the local radio shack that can handle the amps of your fan and wire it in the black wire coming outta the fan.
 

Palantir

New Member
Joined
Jun 15, 2001
Warlord2
I developed a fairly simple circuit designed to convert any brushless DC Fan into a variable speed unit. The details can be found on my webpage, http://www.rpi.edu/~hicksm in the section named "PWM Fan Speed Controller. The unit costs about $10 to built, provided you have some basic electronics tools. Feel free to e-mail me with any questions.
 

Palantir

New Member
Joined
Jun 15, 2001
The use of a potentiometer for fan control, in my opinion, is dubious at best. When one uses a pot, the energy that would be used by the fan is dissipated as heat by the pot; this is defeatind the point. Also, the RS pots are typically 1/4W units. To drop 5V at 100mA with the pot would dissipate 0.5W - twice the rated spec.
 

Colin

Arctic Silver Senior
Joined
Dec 19, 2000
Check my post on a 6 fan LM317 bay bus in the Alternative Mod forum. I still have not posted a parts list.
 
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rudy

Guest
HERE is the link your are looking for. It shows you step by step on how to make one.