Abstract
This paper mainly describes the characteristics of the utilization of thermistor resistance changes with temperature. When temperature is too low or too high, the thermal resistance values change correspondingly. This causes its associating sensor voltage signal changes. The changes of the voltage signal will lead to the subtraction proportional operation and dual comparator threshold voltage change correspondingly. This appearance enables the double threshold voltage comparators output highly, so that the multivibrator starts emitting diode conduct. Therefore the alarm circuit works.
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