Temperature Controller for CPU Cooling Fan

The objective of the project is to build a temperature control that can be adjusted by the user and be able to control several fans with just one sensor.

Using the custom-built temperature control, the desired temperature can be adjusted over a wide range which makes the control suitable both for regulating case temperature and CPU temperature. If the temperature is low enough, fans are switched off. In this design, a MOSFET power N-channel transistor is used along with 10K spindle trimming potentiometer and 10K NTC temperature sensor.

As long as the transistor can handle 12V voltage and the required fan ampere, any N-channel power MOSFET can be used since their pin-out is standardized. The spindle trimming potentiometer can be of higher resistance and it is more elegant and cheaper compared to normal potentiometers. For the NTC thermistor, the cheapest should be considered regardless if it has a high tolerance. Flat thermistors that are shipped with some motherboards can be used for CPU monitoring.

Together with these main parts will include heat-contractible tubing, small PCB, and heatsink for the MOSFET. Short circuit will occur if the circuit is not properly insulated inside.

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