To help remember what the letters stand for, R i is the input resistor, and R f is the feedback resistor, as the output is driving the input through R f. that the same current through R i is going through R f.the inverting input is at a virtual ground as the non-inverting input is tied to ground, and.Remembering the Golden Rules of Op-amps, or the 2 most important things to remember with op-amps, we can see that: This will be covered again, and in more depth, in the op-amp comparator tutorial, but this is sufficient for understanding this tutorial. If the inverting input is higher than the non-inverting input, then the output will go low (which can be negative, depending on the configuration of the op-amp). If the non-inverting input is at a higher voltage than the inverting input, then the output will go high. The true difference between the inverting and the non-inverting inputs is which way the output swings with the voltages on the inputs. They’re a lot easier to use, though, which is why they’re so prevalent. In reality, using the terms “positive” and “negative” are arguably incorrect and, at best, are misleading. Then the input marked “-” is sometimes referred to as negative and other times as “inverting”. If you have been going through these tutorials, you will note that sometimes the input marked “+” is sometimes referred to as positive and other times as “non-inverting”. Before jumping into these configurations, let’s address an important topic.
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