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Use a PNP transistor to PWM a 3-pin PC Fan with an Arduino. Because of how PNP transistors work, you'll need to use a NPN driver as well.
Converting PWM to 0-12V Analog DC - General Electronics - Arduino Forum
This CPU fan speed reduction cable is made of high-quality insulating material PVC, which can be used for a long time, so that you can no longer bear
3-Pin Fan Deceleration Line DGZZI Male-to-Female CPU Fan PWM Cable,Temperature Control Descending Speed line for Computer PC Case Fan RPM Connector
How to implement PWM fan driver using configurable chips - Planet Analog
help) Control a 3-pin PC fan - Motors, Mechanics, Power and CNC - Arduino Forum
Control PWM Fans with an Arduino
PWM a 3-pin PC fan with an Arduino - Bald Engineer
TIP120 as a switch - General Electronics - Arduino Forum
3-Wire fan speed control - Project Guidance - Arduino Forum
Use Arduino With TIP120 Transistor to Control Motors and High Power Devices - Instructables
Trouble getting multiple fan RPM speed - Project Guidance - Arduino Forum
PWM a 3-pin PC fan with an Arduino - Bald Engineer
PWM a 3-pin PC fan with an Arduino - Bald Engineer
sensor - Arduino controlled PWM PC Fan - Electrical Engineering Stack Exchange