Single Opamp Differential Amplifier with gain setable by changing only 1 resistor

105

00:48:29

Resistor Designations as follows:
The 2 input resistors on the left side are equal and labelled R1
The 2 resistors at the top of the T are equal and labelled R2
The 2 resistors at the bottom of the T are equal and also equal to those at the top therefore also labelled as R2
The vertical branch resistor is a fraction of the value R2, designated KR2

The Gain is then given by: G = 2*R2/R1*(1+(1/K))

If R1=R2 then: G= 2+(2/K) and if all resistors are equal G=4 as K is equal to 1 in that case

published 3 years ago

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