random Op Amp Gain adjustment method (slow -- not optimal delay)

i thought it was easy* but (i usually don't compute things unless i have to) when i wrote up a formula it turned out not as such

anyways seems to work without major problems from gain 2 to 8

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note* :: that the GA would equal 1+1/gain (as infact it's $\mathrm{GA}=\frac{1}{\sqrt{1-\frac{2}{\text{Gain}}}}$)

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about :: https://www.w3.org/TR/REC-MathML/toc.html
[Eop]