Useful for +5-V single-supply applications, this op amp circuit features low drain (around 1mA), high input resistance (10 e14 ), and low bias current (10 e-14 A).

*** All Op-Amps LMC606

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If R1=R5 and R4=R7

Then

Vout/Vin = [(R2+R1)/R2] x (R4/R3)

So;  Av~100 for Circuit Show

R2=4.91k