The following page contains detail information regarding the PC Cooling Fan Controller Circuit Board Design. The controller uses one or more ordinary silicon diodes as a sensor, and uses a cheap op amp as the amplifier.
This circuit board design uses a 12V computer cooling fans. These fans typically draw about 200mA when running, so a small power transistor will be fine as the switch. This PC Cooling Fan Controller Circuit Board Design needs only a 12V single supply which can be obtained from a small transformer (< 5VA).
Get more information about the PC Cooling Fan Controller Circuit Board Design, here: http://sound.westhost.com/project42.htm
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