How to control Fan Speed: Make Your PC Quiet - Tech Advisor
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Temperature Based Fan Speed Controller and Monitoring using Arduino » ElectroDuino
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Single Phase Switched Fan Controller (VAC2/S-15E & VAC1/S-15E, 15A Maximum) – United Automation Ltd
Fan Speed Controller - Alfa Electric
SpeedMaster Fan Speed Controller
GENEMA PC 8 Channels Fan Hub Cooling Fan Speed Controller for CPU Case HDD VGA PWM Fan PCI Bracket Power By 12V SATA/4Pin Fan Control - Walmart.com