Integrated circuit adjustable thermostat circuit diagram

As shown in the figure, the TC620 with built-in temperature sensor controls the triac to achieve temperature control. Adjusting Rp1 and Rn in the circuit can change the lower limit temperature control point and the upper limit temperature control point respectively. LED1 lights up to indicate that the ambient temperature exceeds the lower limit temperature control point, and LED2 lights up to indicate that the ambient temperature exceeds the upper limit temperature control point. The selection of the rated operating current of the triac BCR can be determined based on the actual controlled load power.

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