device with each relay to control it on your desired temperature.

The heart of the circuit is a LM358 dual operational amplifier IC. The IC internally contains two separate operational amplifiers in one package. In this circuit we have used both the op amps of the IC, and both opamps are wired as comparators. A 10K thermistor is used as a temperature sensor. The desired temperature for activation of each relay can be selected with the 10K variable resistor connected to its opamp. For relay1 adjust VR1 and for relay2 adjust VR2. The operating voltage of the circuit is 5V to 12V DC. The relay switch should be selected according to the operating voltage.

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The figure shows a two level temperature switch circuit. The circuit can be adjusted for two different temperature levels. There are two relay switches used at the output of the circuit, each relay switch will be activated separately on a desired level of temperature. Therefore you can connect a separate
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Two Level Temperature Switch Circuit Diagram