an inductive proximity sensor is used detect the presence of car in traffic light.the out put circut of the sensor prodecta sin a solidal signom at 30 KHZ .the signal is usuly mixed whitn a random night and law frequency noise a round the signal be signal a saituble cas caded band pass filter remode the wn wanted signal given that with of the pass pand region is no more than 10OKH . also sketch the magnitude and phase respons of the filter

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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.