Thermostat Switch For Automotive Electric Fans Circuit

The circuit, is based on a commercial temperature sensor (TS6178) and an MC3334P ignition chip, When the radiator temperature increases, the sensor pulls the base of Q2 low via Ql, which is wired as a diode. Q2`s collector thus goes high and triggers IC1,

which switches its pin 7 output high and turns on the fan motor via Q3.

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