Temperature Controller Using Lm3911

It is very low-cost and simple electronic circuit project for temperature controller using the LM3911 highly accurate temperature measurement and control system designed in a single monolithic chip.

The output voltage of the LM3911 is directly proportional to temperature in degrees Kelvin at 10 mV/degree K. As you can see in this circuit diagram, LM3911 temperature sensor chip require few additional components.

Temperature Controller Circuit Diagram:

Controller Circuit Diagram
The resistor network consists of R1, R2, and R3 is used to provide the set point voltage reference for the feedback input of the LM3911. R4 resistor is used to limit the current through the internal voltage reference of the LM3911. R5 resistor pulls the output of the IC high when the temperature is bellow the set point. The internal resistor is in series with a diode that allows a switching voltage up to 35 volts to be used.
By modifying the R2 variable potentiometer you will modify the set point of the temperature controller.

This simple temperature controller circuit needs to be powered from a 12 volts DC power supply.

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