The requirement is to be able to measure the temperature of 0-50°, and use voltage to express the temperature, such as 1v at 10°, and 5v at 50°. The academic skills are not accurate. The circuit diagram is below. Please help me find out what is wrong. Is there a problem with the circuit? Thank you
Shannon 发表于 October 20, 2020
The host should use a subtraction circuit, otherwise the common mode voltage will be amplified. In addition, too large bridge resistance will affect the magnification, it is better to use an instrumentation amplifier. The picture below is the subtraction circuit, the original poster can try.
Damien 发表于 October 20, 2020
Change R1 to a potentiometer and do not use a fixed value resistor.
Johnathan 发表于 October 20, 2020
It is a bridge circuit, and a secondary circuit can be added.
