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Differential amplifier

Summary

By: 
Himanshu Choudhary

This project will detail about working of differential amplifier in a circuit. Many electronic devices use differential amplifier internally. A differential amplifier is a type of electronic amplifier that multiplies the difference between two inputs by some constant factor (the differential gain). In the circuit explained here, differential amplifier has been created using IC 741. The pin diagram of the IC is shown below:

IC741

 

Description

 

This circuit based project can be used to understand working of a differential amplifier circuit. A differential amplifier circuit is an amplifier circuit which amplifies the voltage difference between two inputs. This amplification takes place according to the formula

 

Vout=[{(Rf + R1)Rg }/{(Rg+R2)R1}]V-(Rf/R1)V1

 

If all resistances are equal then differential gain becomes unity and Vout becomes V2-V1:

 

 

 

 

 

Vout= V-V1

 

Circuit Diagram

Components

Resistor Image
Resistor

Resistor is a passive component used to control current in a circuit. Its resistance is given by the ratio of voltage applied across its terminals to the current passing through it. Thus a particular value of resistor, for fixed voltage, limits the current through it. They are omnipresent in electronic circuits.

...
LM324 | LM324N Datasheet
IC LM324

LM324 is a 14pin IC consisting of four independent operational amplifiers (op-amps) compensated in a single package. Op-amps are high gain...

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