THERMOSTAT_SEITCH_FOR_AUTOMOTIVE_ELECTRIC_FANS

Published:2009/6/16 2:13:00 Author:May | From:SeekIC

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 Q1, which is wired as a diode. Q2's collector thus goes high and triggers IC1, which seitches its pin 7 output high and turns on the fan motor via Q3.



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