New challenge is here! It's AQQ259 related to a tunable or adjustable amplifier:

The above circuit is a tunable or adjustable gain amplifier. The opamp used is
considered as ideal (i.e. infinite open loop gain, infinite input resistance and
zero output impedance).
Questions:
1. For given R1, R2 and P, at which wiper position α, Vout = 0 volt?
2. Versus Vin, what is the dynamic range of Vout?
Good luck! And try to be among the first ones!
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1. R2/R1 = alpha/(1-alpha) => alpha = R2/(R2+R1)
2. Vout=-R2/R1*Vin ... Vin, but it is also limited by Ecc, I am not sure, what does it exactly mean.
1. R2/R1 = alpha/(1-alpha) => alpha = R2/(R2+R1)
2. Vout=-R2/R1*Vin ... Vin, but it is also limited by Ecc, I am not sure, what does it exactly mean.
Fully correct viktor_vojta , congratulations! And your remark about limitations versus Ecc is of course evident!