IC LM741 or LM301 Temperature Monitor Circuit

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Temperature Monitor with IC LM741 or LM301

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.

Temperature Monitor with IC LM741 or LM301 – [Link]

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