Constant Current Source article (Old)

What CCS do you use, and what for? I see that Morsel is working on one to load an opamp. How's that one coming? That one's jfets, right? When you use one in a project, is it an afterthought? If not, is the main PCB designed with it, or is it a replacement for a resistor?

As I've said before, I've drawn a few. They all use BJTs. I print 'em by the dozen. I don't want to believe that my fascination (read: obsession) was a waste of time. Does anybody want to try a few?