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Experiment 2 - Input Voltage at the Comparator

In the circuit shown, you connect the negative input (pin 3) of the comparator to a potentiometer P1.

Circuit diagram input voltage at comparator.

Input voltage at comparator circuit. (Enlarge)

When you turn P1, you measure, with your multimeter, an input voltage Vin which you can adjust continuously between Vin(min) = 0V and Vin(max) = 9V.

Now you can observe the following...

  • Is Vin greater than the reference voltage VRef, the LED1 lights up.
  • Is Vin smaller than VRef, the LED1 remains dark.

Your comparator circuit compares the input voltage Vin to the reference voltage VRef and shows you which voltage is greater...