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I recommend EEVBlog’s OpAmp tutorial. His explanation is pretty simple to understand. Basically there are two rules (note these rules are ideal, but the exceptions can usually be ignored):

1. No current flows into the inverting and non-inverting inputs.
2. For negative and positive feedback circuits, the OpAmp wants to keep the inputs the same by changing its output, and will sink power to its positive or negative power rails to achieve this.

An orb with a print for a three fingered hand.

I have to wonder how much of what’s left is just repost bots and spam bots. I’ve noticed since the blackout and I’ve stopped opening the app much, I’ve gotten a lot more of those stupid onlyfan bots following me.