Figure 12: Temperature sensing with NTC or PTC. Isolation with transformer driven by sinusoidal signal generator. Output amplifier is with operational amplifier. The temperature sensor R3 can be NTC ...

A NTC resistor or a thermistor is used as a sensor that has a strong temperature dependence. If the NTC temperature rises then the output voltage rises with 0.5 V per 1 0 C. Conversion factor depends ...