Friday, April 5, 2013
Temperature Controlled DC Fan Circuit
This is a simple design 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. This is the figure of the circuit.Operation of the circuit is when the temperature increases the base current of Q1 (BC 547) increases which in turn decreases the collector voltage of the same transistor.
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