High-precision non-contact temperature control circuit 5

This circuit uses the LM3911 temperature detection control integrated circuit.
    Integrated circuit A is internally composed of a reference voltage regulator, a temperature sensor and an operational amplifier. The internal reference voltage is 6.85V.
The voltage between its power supply terminal V+ and the output terminal OUT is proportional to the thermodynamic temperature, and the temperature sensitivity rate is +lOmV/ ℃. Because it
has an internal reference voltage regulator, you only need to use a large enough current limiting resistor to keep its operating current within a few milliamps. Its internal
integrated operational amplifier can be used as a comparator. Therefore, it is very convenient to use it as a temperature detection and control device.
    According to the component parameters shown in the figure, the adjustment temperature range of the potentiometer RP is 20~60℃.