As shown, a diode as a temperature sensor application circuit. Circuits, silicon diodes VD1 and VD2 as a temperature sensor, a temperature coefficient of silicon diode ZmV/. A1
and VT1 constant current source circuit, and the like, to provide a constant current VD1 and VD2. A2 amplifier, the temperature corresponding to VD1 and VD2 voltage change to the desired zoom level. If the output of A2 access can constitute an analog voltage meter thermometer.