The heart of the circuit is a LM358 IC. LM358 is an operational amplifier IC; each IC contains two separate low power & high gain operational amplifiers. The circuit is using both the op amps of the IC. The desired temperature to activate the LED of each internal opamp can be selected with its 10K variable resistor. The operating voltage of the circuit is 5V to 12V DC.
This is a project of a simple two level temperature sensor using LM358 IC. The circuit can be easily calibrated to two different temperature levels and provide visual indication by activating an LED for each level. The circuit is a very good battery save and consumes only 500uA in
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