Op amp voltage followers output the same voltage as the one they see at their input.
It’s easy to generate a specific voltage that is less than the supply voltage. It probably won’t be able to power a desired load though. Pulling current from it will drop the voltage.
An operation amplifier can look at that voltage as a signal, and output that same voltage while providing a lot more current.
- Lower inverting input (-) voltage than non inverting input (+) = output voltage goes up
- Higher – input voltage than + = output voltage goes down
- Connecting the output directly to – means the output voltage will move towards the + input V until the are the same.
- The output will provide the current needed to power a load while staying at the + voltage. Only if Staying within it’s output power limits of course.
Single supply op amp:
Single supply output voltage can drop all the way to the negative supple voltage when powered by a dual supply, or to 0V ground when powered by a single supply power source. The output however will probably be at least a volt or 2 shy of outputting the full positive voltage of the supply powering it.
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