Measuring small temperature changes can be done with a Wheatstone bridge and a thermistor. A thermistor is an electrical component whose resistance changes with temperature.

Bridge circuits have long been popular for conditioning signals from resistive sensors. These circuits are sensitive to small changes in resistance, and they provide a differential output from a ...

A Wheatstone bridge is one of those handy circuits that has plenty of uses in both AC and DC measurements. We probably see them most often in a strain gauge.

The basic form has been extended to measure the integral of temperature × time above the pre-selected value by building the thermistor, the voltameter and a diode into a wheatstone bridge circuit.