![]() ![]() ![]() The fans in computers gather cool air from the ambient and expel the warm air outside. All computers have built-in fans, as they are one of the approved cooling mechanisms for processors. The PWM signal is the control input of the PWM fan.Ĭooling fans are a vital part of computer hardware, as they cool the CPU and ventilate casing, enabling active cooling in computers. PWM fans are 4-pin fans, where the fourth wire sends a PWM signal to the fan motor. PWM fans are DC fans with an extra wire for PWM. These fans are also called 3-pin fans, as they come with 3 pins: a supply pin (usually 12 V DC), a ground pin, and a signal pin. Cooling fans are a vital part of computer hardware, as they cool the CPU and ventilate casing.ĭC fans are supplied with DC power from regulated DC supply or motherboard header pins. ![]()
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