Hi all, Just thought I would post this link in case anyone is interested - it's for= =20 MiscEl, a bit of software that does all sorts of useful calculations (Coils= ,=20 transmission lines, Ohms law, filters, CRCs, Heatsinks, Serial, etc etc) The download link is right down at the bottom of the page linked to. http://www.miscel.dk/MiscEl/miscel.html=20 --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .