Op Amp Voltage Follower – Single Supply

Op amp voltage followers output the same voltage as the one they see at their input.

Operational amplifier voltage follower using LM358 op amp learning electronics lesson 0022
Operational amplifier voltage follower using LM358 op amp learning electronics lesson 0022

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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