+9 V R 4.7 k? R2 1 kN VOUT THERMISTOR TEMPERATURE, c RESISTANCE, kn 60 1.256 2N3904 65 1.481 RTherm R3 470 N 70 1.753 75 2.084 80 2.490 (b) Temperature characteristic of the thermistor for the specified range (a) Circuit

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Differential amplifier

There are two amplifying stages with common degeneration in a differential amplifier.