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I've assembled an amplifier circuit which is composed by a V1 and V2 input and Vo output.V1 is 1V and V2 varies from -5v to +7v with increments of 0.5v.

The formula for Vo is:

Vo=(1+R2/R1)x(R4/(R3+R4)xV2) - (R2/R1)xV1

My questions are:why does the equation |Vo experimental - Vo theory| gives wrong values(Vo experimental is the output I got after testing the assembled circuit and Vo theory is when substituting the values on the equation)?Also,why are the value of the output voltage when I simulate the circuit on microsim different from the voltage theory and experimental output values?Could the experimental value result be influenced by the internal resistance of the measurement device?

Thanks in advance for the reply!

The formula for Vo is:

Vo=(1+R2/R1)x(R4/(R3+R4)xV2) - (R2/R1)xV1

My questions are:why does the equation |Vo experimental - Vo theory| gives wrong values(Vo experimental is the output I got after testing the assembled circuit and Vo theory is when substituting the values on the equation)?Also,why are the value of the output voltage when I simulate the circuit on microsim different from the voltage theory and experimental output values?Could the experimental value result be influenced by the internal resistance of the measurement device?

Thanks in advance for the reply!

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