How does this Op Amp configuration work?

Hi! I found a similar question asked on Quora phrased as "Will an inverting op amp configuration still work if I tie the negative side to the ground instead of the positive side?", so the answer there might help you:

Since the op-amp is "just a difference amplifier with ideally infinite gain", any difference between the inputs results in a full scale output - either hard positive or hard negative rail - right? Not a lot of use to anyone. .So how do we make it not infinite gain so we get a useful output from it? With feedback - negative feedback. .We feed some of the output back to the inverting input to give it some useful gain characteristic.

The feedback MUST be to the inverting input, or the op-amp output will just go to one or other supply and stay there.That being the case, as long as you keep the feedback network intact and attached to the inverting input, the inverting and non-inverting configurations are identical. .You may just - as you said - apply your input to the other side. .The formula for calculating the gain changes , and it won't invert if you use the non-inverting input..

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/r/AskElectronics Thread