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Forum: Analog Circuits Operational amplifier


Operational amplifier
von Burry (Guest)

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For this operational amplifier circuit, calculate the necessary values 
of R1 and R2 to limit the voltage gain to 5 and 55, respectively, with a 
potentiometer resistance of 10 kilohms.

Guys, please help me . I can’t find the formulas. Thank you

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Re: Operational amplifier
von Robert M. (r0bm)

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Yunal wrote:
> I can’t find the formulas.

For two unknown variables (R1,R2) you need to solve two equations:

5=((R2/(R1+10k))+1

55=((R2+10k)/R1)+1

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