PWM Computer Fan Controller Circuit Diagram DIY PWM Control for PC Fans: This Instructable describes building a fully-featured 12 V PC fan PWM controller. The design can control up to 16 3-pin computer fans.
Even at low PWM duty cycles the fan runs at higher than expected speed, in my testing it was not possible to achieve quiet operation with 4 pin fans using an external PWM driver circuit. Explore the workings of a fan controller circuit with a detailed schematic. Learn how to control the speed of your fans for optimal cooling and noise reduction in your computer or electronic projects. Learn how to use the 12v PWM Fan (120mm) with detailed documentation, including pinouts, usage guides, and example projects. Perfect for students, hobbyists, and developers integrating the 12v PWM Fan (120mm) into their circuits.
How to Use PWM fan: Examples, Pinouts, and Specs Circuit Diagram
UPDATE 11/5/2023: See my latest project for a newer, feature rich PWM speed control circuit with tachometer readout, rotary encoder interface, and more: Let's start with a small and simple prโฆ
This neat fan controller project requires only a little time, expense, and commitment, and the circuit is easy to build and satisfying to use! PWM Phase Control The length or the pulse width of this delay pulse can be varied by suitably adjusting VR1 which also becomes the speed control knob for the discussed PWM controlled fan regulator circuit. DC fan control circuits with speed control will use PWM driving to control average power delivery as described above. Depending on the required current delivery, control circuits for large and small fans could be designed from discrete components or from an integrated fan controller.
