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Inverting  Summing  Amplifier MT-214


I have been happy to brush up on my op-amp theory with your mini tutorials and think I spotted a small typo in an equation.  On page 2, the (V2-Vref) chunk should be multiplied by the resistor ratio of that input, similar to Eq. 4. 

See attached image for possible correction.

What do you think?


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