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Computer fan control
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==== Resistors ==== [[Resistor]]s in series with a fan's power pin are the simplest method of reducing fan noise, but they add to the heat generated inside the [[computer case]]. Since the voltage drop is proportional to the current, the fan may not start. They need to be of the appropriate power rating. For variable fan control, [[potentiometer]]s could be used along with a [[transistor]] such as a [[MOSFET]] whose output voltage is controlled by the potentiometer. It is possible to use a [[rheostat]] instead.
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