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Controlling a 4-wired fan PWM Signal using Arduino allows only two settings - Electrical Engineering Stack Exchange
Is it possible/safe to get an adapter for my fans that connects two 3-pin fans to one 4 pin on the motherboard? - Quora
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3 pin fans: What are the voltages used by the tacho (speed) line? | AnandTech Forums: Technology, Hardware, Software, and Deals
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