--_003_201202221738q1MHb6mQ024422mailhubdmz3mitedu_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hello, when you have an Op Amp based differential circuit, like this: Emacs! R1 should be =3D R2, and Rf should be =3D Rg, else asimmetry will arise. Now, as gain is calculated as Rf / R1, a problem arises: if I want a gain o= f 1 (of course using a unity-gain stable OpAmp), what is better to use 100k ohm for= all 4 resistors, or 10k ohm? It's a CMOS OpAmp, thus high impedance. I mean what are the pro's and the con's of using low value or high value re= sistors? Thanks! 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