Auto electric fan constant temperature control switch circuit
The basic device of this circuit is a temperature sensor (TS6178) and an ignition chip MC3334F. When the temperature of the heat sink rises, the sensor makes the base voltage of Q2 become lower through Q1 (connected into a diode shape). The electrode voltage becomes high, triggering IC1. Make its output (pin 7) high. This high-level voltage turns on the fan motor through Q3.
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