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DELL fans use a different pin-layout than normal fans, so watch out before connecting them! | The Wiert Corner - irregular stream of stuff
Is it normal for a 4 pin fan splitter to have 1 4 pin input and x 3 pin inputs? Does that still work with PWM? - Quora
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circuit design - 4-wire fan controlled by potentiometer and 555 IC not behaving properly - Electrical Engineering Stack Exchange
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50 Best Of 4 Wire Ceiling Fan Switch Wiring Diagram | Ceiling fan wiring, Ceiling fan switch, Ceiling fan pull chain
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