> Wow, I completely missed that. And I'll probably never go above 15W=20 > anyway, > so yeah, I could use maybe 4 power transistors in parallel and regulate=20 > each > individual one to sink an equal current to a total of whatever I want. I > already have constant current source designed, so this shouldn't be too > hard. Just one transistor will do as the power element. You just need a control=20 circuit for constant current or constant voltage or even constant power=20 (might want a PIC for that). -- Bob Ammerman RAm Systems --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .