I have two circuits at
I would like to have the output from the temperature sensor light up a red LED when the temperature exceeds 130° Fahrenheit in place of the voltmeter in the first circuit (1). Since the first circuit is supposed to scale the output and provide 10 mV/degree, could a proper comparator circuit be made to indicate when the voltage exceeds 1300 mV or 1.3V? (Circuit B)
I have no clue how to calculate what resistor values would be needed in the comparator circuit (2). I am assuming there will need to be a trimmer to vary when the LED would turn on, maybe at V - REFERENCE? Would I need to supply the comparator voltage from a different source and what would that be?
Any help is certainly appreciated; Don