The little 65W USB-C supply for my laptop has some kind of coil whine or other noise that is noticeable when my computer is busy, or redrawing the screen, or other kinds of activity.
It actually ends up having a sort of similar noise/activity profile to when HDDs would spin whenever you worked on stuff. I can't decide whether it's annoying or not, but it is somewhat comforting in a familiar way.
I bet @cr1901 would love it.
