Answer to Question #184795 in Electrical Engineering for SATISH SAHU

Question #184795

The safe range of operation of a temperature controlled chamber is to be indicated by means of a green LED which should glow when the temperature is between 25 and 45 degrees above the ambient temperature. A green LED has a typical forward cut-in voltage of 3.3 V. If the temperature sensor of choice is a Pt100 RTD, with a nominal value of resistance Ro = 100 , temperature coefficient of resistance  = 3.85*10-3 / oC and a maximum safe current of 100 A, design a circuit to obtain the above, provided that the maximum current through the LED is to be limited to 10 mA. = ohm

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