Computer Cooling Fan Wiring Diagram

The internal diagram of a typical two wire fan is as follows.

Computer cooling fan wiring diagram. 2 speed electric cooling fan wiring diagram duration. The third wire gives your computer a measure of control over that. It uses a 40 amp electric relay and electric fan sensor. However for optimum performance it may become necessary to slightly change the values of components c1 r4 and c2.

Hayden flex a lite or perma cool brands can provide a 12 volt output when activated. The cooling fan wiring diagram below is what we ve found to be the simplest and most reliable method. Suggested electric fan wiring diagrams suggested primary cooling fan single speed on off using 12 volt switching devices only for primary activation note. Usually for more flexibility they have a male female 4 wire molex power connector.

Relays shown in these diagrams can provide options. Finally note that the connector of a common 2 wire fan has a red and a black cable. You can use almost all standard 3 wire cooling fans with this adapter circuit. The red cable goes to the positive of the power supply and the black to the negative.

The connector of a 2 wire fan has a red and a black cable. It reports the speed of the fan back to the computer s processors which allows the motherboard to control the speed of the fan by raising the voltage and speeding the fan when the extra cooling is required and lowering it when it s not needed. The red cable goes to the positive of the power supply vcc and.