The gain can be determined by solving the circuit equations. Neglect the effects of L1 and R13, and assume an ideal op amp.
The equations are:
(Vin-Vplus)/R1 = (Vplus-Vout)/R2
Vplus=Vout*Rp/(Rp+R3)
Where Vplus is the voltage at the op amp input terminals. (For an ideal op amp the voltages are the same at both input terminals.) Rp is the parallel combination of R4 and R5.
Solving the above equations gives:
Vout/Vin=R2*(Rp+R3)/(Rp*R2-R1*R3)
The gain for this circuit is 32.
The equations are:
(Vin-Vplus)/R1 = (Vplus-Vout)/R2
Vplus=Vout*Rp/(Rp+R3)
Where Vplus is the voltage at the op amp input terminals. (For an ideal op amp the voltages are the same at both input terminals.) Rp is the parallel combination of R4 and R5.
Solving the above equations gives:
Vout/Vin=R2*(Rp+R3)/(Rp*R2-R1*R3)
The gain for this circuit is 32.
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