Minuscule circuit of the electric AC heater controller presented here is built around the renowned 3-Pin Integrated Temperature Sensor LM35 (IC1) from NSC. Besides, a popular BiMos Op-amp CA3140 (IC2) ...

However, for precision temperature ... compensation circuit that provides a current proportional to the square of I PTAT, a current proportional to absolute temperature. The LM35 sensor ...

I made this project because I wanted a way to automatically control the speed of a DC fan according to the temperature read by a LM35 sensor. I had a few problems ... but you can use the circuit ...