I guess my question is summed up by the title pretty well. I already have an LM317-based supply that I built as a kid. Long story short, it doesn't work that well and I'm going to rebuild it. It makes sense to just go for a bipolar supply since I pretty much exclusively work with audio.
I was thinking about building the dual rail regulated supply that's basically right out of any LM337 datasheet. I think I found a more complete schematic on the forums here at some point in time. Here it is:
I didn't really know much about power supplies a few days ago until I started reading. I've heard from multiple sources that linear regulators can't sink current. However, it seems to me like it's one of those things that's a matter of perspective. Like, the LM317 can sink current for the LM337 and vice versa. However this only makes sense in my mind if current flows from rail to rail.
A more likely scenario in a headphone amplifier is that current will flow from rail to ground. I can't image how the electrons would flow such that the complementary regulator sinks current.
In short, how much current can this ground sink and why?