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IT'S AN AMPLIFIER CIRCUIT WHICH "AMPLIFIES" Vin BY 1+(R2/R1) + (R2+R4)/Rb TO PRODUCE Vout. PROPER SELECTION OF R1,R2,R4 AND Rb WILL PRODUCE THE DESIRED AMOUNT OF AMPLIFICATION. APPARENTLY R3 IS IRRELEVANT.
AND THAT'S NOT FROM AUTOCAD, IT'S A pSPICE PROGRAM