Are you saying that the feedback resistance is R2 + Rp||R4, therefore the gain is -(R2 + Rp||R4)/R1? Is this for the case x = 0? It isn't the same as the correct expression you gave in post #11: (-R2 - Rp - R2 * Rp / R4)/R1
Hi The Electrician, I having trouble understanding this question and wondered if you could help.
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