So, about a decade and a half ago, I worked with some very ill-tempered rail-rail opamps. They were among the first-generation rail-rail amps, and they had the "nice" feature that in spite of their specified behavior, they'd go unstable as a voltage follower if you just connected the output to the negative input -- but they'd work fine if you did so through a 1k-ohm resistor.
I got into the habit of putting a resistor there in my voltage followers.
I just discovered an error in a circuit of mine that uses TSV912 op-amps, connected as voltage followers, with 22K-ohm resistors from output to input. I'm having a very "d'oh" moment, because I'm thinking that if you DO want resistors there at all, you really want something in the 200-ohm to 1k-ohm range. Habit, I think, kneecapped me.
So, I'm going to experiment around with the best value for this, but does anyone have any suggestions as to how to figure out what to use? Was that old ill-tempered op-amp that I used Back Then a fluke, or is it generally advantageous to use a resistor in the feedback path of a voltage follower?
Suggestions welcome.