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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.
A PWM Based Fan Controller for Arduino - CodeProject
How to implement PWM fan driver using configurable chips - Planet Analog
Trouble getting multiple fan RPM speed - Project Guidance - Arduino Forum
Computer Fan 3 Pin to Motherboard 4 Pin PWM Fan Header Adapter Cable - MODDIY
3 pin PC fan - Project Guidance - Arduino Forum
How to pick from all the Arduino boards - Bald Engineer
UDM PRO Nocuta fan mod : r/Ubiquiti
DIY Arduino PWM PC Fan Controller (Part 1) [Prototype] #0000
3-Wire fan speed control - Project Guidance - Arduino Forum
Teensy 4.0 Brings 600 MHz Cortex-M7 to the Arduino World, by James Lewis
Arduino Fan Control // 2-Wire, 3-Wire, and 4-Wire CPU Fan Speed Control and Measurement
Arduino Fan Control // 2-Wire, 3-Wire, and 4-Wire CPU Fan Speed Control and Measurement
Control PWM Fans with an Arduino