[EE]: Advanced PCB design reports http://www.mentor.com/pcb/tech_papers.cfm?v=205729&p=7128297&s=4134334&c=sdd _google_keyword.gif Most (but not all) areas covered are beyond the scope of typical hobbyist PCB designs. Mentor Graphics. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.