I'm trying to understand how the LM317 works? I've found that a good simplification is the following:
So a practical example would be
Where R2 corresponds to a load.
What I don't have clear is the effect of connecting the negative voltage supply of the op-amp to the emmiter, instead of earth.
I guess that this is done so there is no need for another pin in the LM317, but would make any difference? The simulation, doesn't show any difference, but could it affect the stability or something like that?