Olin, I haven't given up. It's just that the book recommended to me, _Introductory Circuit Analysis_ is over 1100 pages and it will take me a while to get through it properly. Great book though. One of the best I've come across so far. Lindy -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist