How to implement PWM fan driver using configurable chips - Planet Analog
DIY Circuit - Square Wave Generator for 4-Wire PWM Fan Speed Control - YouTube
Amazon.com: PC Fan Governor, PC Fan Speed Governor, 4-Wire Pwm Fan Controller Manual Speed Regulation Fan Speed Controller with Buzzer for Computer : Electronics
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HW-585 PC CPU Fan Speed Controller
PFC0812DE-SP07, 80x80x38mm, 12 VDC, PWM speed control, speed sensor (Tach), 0.80 A, 9.60 Watts, speed 6000 RPM, 4 lead wires, ball bearing, axial, dc fan, delta
Using a programmable system-on-chip for fan control - Embedded.com
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Noctua PWM specifications white paper
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PWM fan | Delta Fan and Thermal Management Products | Delta Electronics Inc.