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Questions relating to the construction and applications of operational amplifiers, which are DC-coupled, high-gain electronic voltage amplifiers with a differential input and, usually, a single-ended output.

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Vdiff at input of op-amp

This can be due to the ac coupling of the instrument, this cause an almost total insulation between BJT input and the ground, remember then if the input is not connected to anywhere you can't bias the …
Alesandro Giordano's user avatar