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How pc fans work the vast majority of pcs has at least one of them i wanted to add my 2cents to the 3 wire fan diagram my experience has been that a number of vendors use highspeed 3 wire fans that look like normal 80mm units but have reversed polarity and are designed to run around 3000rpm instead of the normal 2000 2200rpm they work . If you need to install a 3 wire computer fan forget the wiring diagram most computer motherboards come with a standard connector for the fan and it only fits one way if the connector fits the pins itll work and you dont have to worry about the pin arrangement. Pc fan controller circuit diagram place the temperature sensor in the warm air of the fan when the pc is connected the speed rotation of the fan will be pretty high because of c1 but will decrease at a minimum value measure with a thermometer the air temperature close to the sensor. Ceiling fan and light wiring diagram collections of wiring diagram for ceiling fan with light uk inside switch techrush wiring diagram ceiling fan light two switches new how to wire a wiring diagram for ceiling light with switch fresh need wiring wiring diagram od ltg ortech wiring diagram collection