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).
- If Vin < Vref, Vo = -Vsat @ – VEE
- Vin > Vref, Vo = +Vsat = +VCC.
|Vin||V Ref=v||V = o/p|