Circuit Converts PWM Fan Drive to Linear and Reduces Acoustic Noise
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PWM Fan controllers using the 555 timer IC | Zak's Electronics Blog ~*
So you want PWM control of your 3-pin fan? | TechPowerUp Forums
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Circuit makes PWM fan drive linear with temperature change - EDN
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Quick Hack: Converting a computer fan from thermostatic to PWM control | Rip It Apart - Jason's electronics blog-thingy
Lingenfelter VSFM-002 Variable Speed DC Brushless Fan & Pump PWM Controller
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PC Fan PWM signal circuit using 555 timers: Can anyone explain this circuit to me? - Electrical Engineering Stack Exchange
