As shown in figure "A" of the illustrated proportional analog controller circuit, what is the primary purpose of operational amplifier "U2"? See illustration EL-0100.

Question

Accepted Answer

amplify the error signal voltage by producing a gain

Answer

add the error signal voltage to the bias potentiometer output voltage to produce a summing signal voltage

Answer

subtract the error signal voltage from the bias potentiometer output voltage to produce an error signal voltage

Answer

invert the error signal voltage

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