speed control Temperature DC fan
Here is a simple circuit based on two transistors that can be used to control the speed of a 12 V DC fan depending on the temperature.A thermistor (R1) is used to sense the temperature.
Circuit diagram with Parts list.
Notes.
- The R1 can be a 15K @ 20°C ,N.T.C thermistor.
- The M1 can be a 12V,700mA fan motor.
- The capacitor C1 must be rated 25V.
- The circuit can be powered from a 12V PP3 battery or 12V DC power supply.
- Assemble the circuit on a good quality PCB or common board.
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