> disclaimer I cannot guarantee that what is written above is correct It's actually pretty good! I'd nitpick some minor details or change some emphasis but you

> disclaimer I cannot guarantee that what is written above is correct It's actually pretty good! I'd nitpick some minor details or change some emphasis but you're close enough that it's basically being a dick to nitpick at that level. The only real mistake is this: "a resistor... wastes a ton of power". In fact it wastes exactly as much power as a current source, which is basically just a variable resistor that sets itself to the proper value. Of course, it's still useless for anything dynamic.