So I want a little 0-20V, few mA (say 5 mA) adjustable supply, I do want it to go right down to zero. So I'm leery of just an opamp, because I want to stick ~0.1 to 10 uF on the supply. I made a simple high side pass element driven by an opamp thing. Works fine, but is there something simpler, better... (stronger, faster, able to leap small buildings) Maybe some opamp that can drive C-loads? (+/-18V rails) Or just do the trick where you compensate the C with the right series R and fast (C) feedback around opamp only.
George (many questions) Herold