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2. Computer fan control - Wikipedia

   en.wikipedia.org/wiki/Computer_fan_control

   The sense pin is used to relay the rotation speed of the fan and the control pin is an open-drain or open-collector output, which requires a pull-up to 5 V or 3.3 V in the fan. Unlike linear voltage regulation, where the fan voltage is proportional to the speed, the fan is driven with a constant supply voltage; the speed control is performed by ...

3. Computer fan - Wikipedia

   en.wikipedia.org/wiki/Computer_fan

   This is a special variant of the Molex KK connector with four pins but with the locking/polarisation features of a three-pin connector. The additional pin is used for a pulse-width modulation (PWM) signal to provide variable speed control. [26] These can be plugged into 3-pin headers, but will lose their fan speed control.

4. Potentiometer - Wikipedia

   en.wikipedia.org/wiki/Potentiometer

   It is also used in speed control of fans. Potentiometers operated by a mechanism can be used as position transducers, for example, in a joystick. Potentiometers are rarely used to directly control significant power (more than a watt), since the power dissipated in the potentiometer would be comparable to the power in the controlled load.

5. Talk:Computer fan control - Wikipedia

   en.wikipedia.org/wiki/Talk:Computer_fan_control

   2 Fan Speed Controllers. 3 comments. 3 Popularity of PWM. ... 1 comment. 5 How does software, which is digital, exert physical control? 1 comment. 6 Voltmnodding +5V ...

6. Embedded controller - Wikipedia

   en.wikipedia.org/wiki/Embedded_controller

   In this case, the ergonomics of the system are improved because the fan is quieter, as it is controlled to rotate at a lower speed and does not change speed as often. However, when the temperature does cross the controller's threshold, it will take much longer to reduce the temperature to safe levels.

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9. Pulse-width modulation - Wikipedia

   en.wikipedia.org/wiki/Pulse-width_modulation

   Variable-speed computer fan controllers usually use PWM, as it is far more efficient when compared to a potentiometer or rheostat. (Neither of the latter is practical to operate electronically; they would require a small drive motor.) Light dimmers for home use employ a specific type of PWM control.