5) One approach to "offset correction" involves the adjustment of the values of Rc1 and Rc2 so as to reduce the differential output voltage to zero when both input terminals are grounded. This offset- nulling process can be accomplished by utilizing a potentiometer in the collector circuit, as shown in the circuit below. We wish to find the potentiometer setting, represented by the fraction x of its value connected in series with Re1, that is required for nulling the output offset voltage that results from: (a) Rc1 being 4% higher than nominal and Rc2 4% lower than nominal (b) Q1 having an area 20% larger than that of Q2 Vcc

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Thermistors

A thermistor is a special type of resistor whose resistance is more temperature-dependent than standard resistors.  The resistance of the thermistor decreases with increasing temperature. This is the basic principle of thermistors. This allows the thermistor circuit to detect very small temperature changes that cannot be observed with the Resistance temperature detectors (RTDs) or the thermocouples. Since the resistance of a thermistor is temperature dependent, it can be connected to an electrical circuit to measure body temperature. This high sensitivity to temperature changes makes thermistors very useful for accurately controlling and calibrating temperature measurements. In general, resistance increases with increasing temperature in most metals, but thermistors react negatively.