7.50 Figure P7.50 shows the circuit of an amplifier fed with a signal source v with a source resistance R: The bias circuitry is not shown. Replace the BJT with its hybrid- equivalent circuit of Fig. 7.24(a). Find the input resistance R„ = v,li, the voltage transmission from source to amplifier input, v,lvg, and the voltage gain from base to collector, v,Ju.. Use these to show that the overall voltage gain v,Jv is given by BR. r,+Rg

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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.