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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.
Fan RPM detection issue - Programming Questions - Arduino Forum
PWM a 3-pin PC fan with an Arduino - Bald Engineer
How to connect a 3-pin fan to Arduino - Quora
Проблема с питанием 3 pin вентилятора через PWM
Why do engineers (love to) hate Arduino? - Bald Engineer
3-Wire fan speed control - Project Guidance - Arduino Forum
So you want PWM control of your 3-pin fan?, Page 5
Arduino: De-Bounce a Button with micros() or millis() - Bald Engineer
Arduino Fan Control // 2-Wire, 3-Wire, and 4-Wire CPU Fan Speed Control and Measurement
3-Wire fan speed control - Project Guidance - Arduino Forum
PWM a 3-pin PC fan with an Arduino - Bald Engineer
25 kHz 4 Pin PWM Fan Control with Arduino Uno
Trouble getting multiple fan RPM speed - Project Guidance - Arduino Forum
How to control a CPU fan using the Arduino
Controlling fan speed via PWM - Project Guidance - Arduino Forum