Using a thermistor in the position shown makes a heat activated sensor. A change in temperature will alter the output of the opamp and energize the relay and light the LED. Swapping the position of the thermistor and 47k resistor makes a cold or frost alarm.
Download semiconductor parts datasheet. (PDF Format)
1. LM741
2. LM301
3. BC182B
Temperature Monitor with IC LM741 or LM301 - [Link]
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