Op amps and comparators are always comparing the voltages at the inverting input and the non inverting input. The voltages at the input affect the output.
Without feed back (letting the output voltage influence one or both inputs) you have a comparator circuit.
Basic rules are….
- Non inverting input with a higher voltage than the inverting input = a high output.
- Non inverting input with a lower voltage than the inverting input = a low output
- Inputs just look at voltage. They don’t let current (other than a small amount of leakage) through them.
- High output means the output voltage is as close to the positive supply voltage as the output can provide, up to the maximum current that it can provide.
- Low output means that the output voltage is as close to the negative supply/ground voltage as it can provide, up to the maximum current that it can provide.
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