[mythtv-users] Slightly OT - Controlling the CPU fan

Robert Johnston anaerin at gmail.com
Sun Aug 21 23:05:11 UTC 2005

On 21/08/05, Robert Johnston <anaerin at gmail.com> wrote:
> Generally, 7v is enough to start most fans. 5v would not be.
> However, the very best way to run fans at slow speeds would be to use
> a PWM circuit system, that way the fan motor always has 12v to turn
> it. The only disadvantage of PWM is a possible "growling", but that's
> generally only found at VERY low speeds, and isn't audible if the PWM
> Frequency is above 20khz.

And, to show how easy it is to make a PWM system, here's a Bit-Tech
article (From 2001) on how to do it:

Robert "Anaerin" Johnston

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