Voltage Comparator circuit

Voltage Comparator circuit:-   A fixed reference voltage Vref  is applied to the (-) input, and the other time – varying signal voltage Vin is applied to the (+) input; Because of this arrangement, the circuit is called the non-inverting comparator.  Depending upon the levels of Vin and Vref the circuit produces output.  In short, the comparator is a type of analog-to-digital converter.

At any given time the output waveform shows whether Vin is greater or less than Vref.  The comparator is sometimes also called a voltage-level detector because, for a  desired value of Vref, the voltage level of the input Vin can be detected.


  • A fixed reference voltage Vref is applied to the (-) input, and to the other input a varying voltage Vin.
  • Vary the input voltage above and below the Vref  and note down the output at pin 6 of 741 IC.   
  • Observe that, when Vin less than Vref, the output voltage is -Vsat ( @ – VEE)
  •  when Vin is greater than Vref­, the output voltage is +Vsat (@+VCC).

Comparator Calculation:

  • If Vin < Vref, Vo = -Vsat @ – VEE
  • Vin > Vref, Vo = +Vsat = +VCC.


VinV Ref=vV = o/p

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