As shown in the figure, the thermostat consists of a step-down rectifier circuit and a temperature measurement control circuit.
In this circuit, 555 and R1, RP1, RT1, and RT2 form a bistable mode of operation. RT1 and RT2 use NTC thermistor. When the ambient temperature rises, the resistance values ​​of RT1 and RT2 become smaller. When the potential of the 2 pin is lower than the trigger level of 1/3Vdd, 555 is set, J is pulled, and the motor power is turned on. Power on the air. Conversely, when the temperature drops, the resistance values ​​of RT1 and RT2 increase, so that when the potential of the 6-pin is higher than the 2/3Vdd threshold level, 555 is reset, J is released, and the motor stops.
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