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.
Dual Supply Op Amp:
A dual supply output, also known as a split supply output falls short of both ends of the supply voltage range. Usually at least a volt or 2 away from the positive rail, and negative rail voltage. 0V ground is typically the middle voltage of a dual/split supply, and therefore there is a positive and negative voltage in relationship to it. Some op amp circuits just need an output voltage that stays relatively close to the 0V ground for a dual supply, or close to the middle voltage for a single supply.
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