The other end of POT is left open.Ī 10KΩ thermistor is connected between pins 7 and 6. A 10KΩ POT is connected between supply and pin 7 with wiper of the POT connected to pin 7. It is configured as an astable multivibrator. The circuit is based on good old 555 timer IC. 10KΩ Negative Temperature Coefficient (NTC) Thermistor - 1.In this project, a PC fan controller circuit is designed using simple hardware, where the speed of the PC fan is automatically adjusted according to the temperature of the processor. In active air cooling, a small fan will blow cool air in to heatsink or cooling plate that is attached to the processor or any other electronic device that needs cooling. Of all the computer cooling techniques, active air cooling is the cheapest and most commonly used technique. There are several PC cooling techniques like active and passive air cooling, active and passive water cooling, bong cooling, cooling using Peltier thermo elements etc. Hence, several cooling techniques are introduced over the years to achieve suitable temperature and humidity conditions for a computer to run hassle free. Heat is an enemy to electronics and particularly computers. As computers grow bigger and faster, the power consumption is also increasing (talking about high performance desktop processors and not about low power consumption mobile or laptop processors).Įven the modern electronics have low power efficiency and majority of the power drawn by a computer processor is turned in to heat.

Case fan controller