consumption feature make them suitable to operate with batteries.

The heat sensor circuit shown here can be used to control any AC or DC device on desired temperature. The operating voltage of the circuit is 5V to 12V DC. The relay switch should be used according to the operating voltage. The desired level of temperature can be selected with the 50K variable resistor. You can also make experiments by using different values of resistors and thermister to further adjust the circuit.



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This article describes a project of a simple heat sensor switch using LM393N IC. LM393N is a dual voltage comparator IC with many great built in features. Like low power consumption, wide operating voltage from 2V to 36V DC, wide bandwidth, high gain etc. The low power

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Heat Sensor Switch Using LM393N Voltage Comparator IC