The temperature sensor of this circuit uses LM134, and uses the transistor 3CG21 to shunt the LM134, so that the temperature error caused by the heat generated by the LM134 itself can be completely ignored. In order to measure the Celsius temperature and directly read the signal, the signal generated at 273K corresponding to 0 °C is compensated. The method is to provide the compensation current 273uA with the reference voltage source 1403, so that the output voltage of the op amp OP07 is 0V at 0 °C, and the display value after being sent to the digital voltmeter also becomes 0V, and increases by +10mV / °C. Adjust R5 in the circuit to make the output of the op amp 0V. Adjust R3 or R6 to make the op amp output full value.
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