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    Do I understand OpAmps wrong?

    I'm sorry. That was a little vague. The first answer, under your question was to it, and my last post was in response to KrisBlueNZ. My + and - 2.5V supplies are relative to the ground on the one side of R4, so Vin is actually changing the value of the supplies. I should have included my power...
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    Do I understand OpAmps wrong?

    They do. Thank you. I'm injecting voltage at my ground through the one resistor at the non-inverting input of the difference amp, and changing my supply voltage. I don't know how I could prevent that easily.
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    Do I understand OpAmps wrong?

    The input is a separate bench power supply. I'm using a simple 2-resistor divider to get +2.5V, -2.5V, and GND from a bench supply at 5V. Those are the supplies and the one ground that are marked in the image. I'm then connecting a separate bench supply to Vin, and measuring Vout relative to...
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    Do I understand OpAmps wrong?

    First of all, thank you all for such a nice forum. A lot of great info here. I have a very simple OpAmp circuit that consists of two opamps. One in difference amp configuration and another in voltage follower. (Attached) The idea is an isolated voltage reading from Vin. I built a simple...
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