On 21/08/05, Robert Johnston <[EMAIL PROTECTED]> 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: http://www.bit-tech.net/modding/2001/12/03/pwm_fan_controller/1.html -- Robert "Anaerin" Johnston _______________________________________________ mythtv-users mailing list [EMAIL PROTECTED] http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
