Discussion in 'Electronic Basics' started by u035m4i02@sneakemail.com, May 19, 2005. Guest. It seems like a simple question, but I've gotten drastically different. responses from different people. How do you calculate the differential. input impedance for an amplifier like this: http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/opampvar6.html.
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