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This Processor Fan Control circuit is intended to be used with relatively old PCs, since more recent models generally have a fan control circuit already integrated into the motherboard. These controllers ensure that the amount of cooling is increased if the processor becomes too warm and decreased if the processor temperature is relatively low.
This PC fan controller circuit is designed with discrete components and is used to control 12 V fans that have a current consumption lower than 200 mA. With the components values presented in the circuit diagram, the voltage won’t drop below 7 V. If the fan won’t start at 250C then temporarily replace the temperature sensor KTY10 with a 1.8 kΩ resistor and reduce the value of R7. If the PC fan has a speed too high then increase the R7 value.
This auto bathroom fan control circuit design is a lamp and fan motor control with a delayed switch off. This automatic fan control is commonly used in toilet and bathrooms. When switch S1 is closed, the fan motor and the lamp turns on. When switch S1 is opened (switched off), the lamp goes out but the fan motor will keep running for another 3, 6 or 1 minutes linger (set by S2). This delayed switching off of the fan ensures that the unwanted odor is really fanned out the toilet.
