On Tue, May 24, 2011 at 8:10 AM, Olin Lathrop w= rote: > On two layer boards of similar complexity, I try to keep all the traces o= n > the top layer and only use the bottom layer for short "jumpers" as needed= .. > That way the rest of the bottom layer can be a ground plane. =A0A good ex= ample > of this is the USBProg. =A0The top side drawing is at > http://www.embedinc.com/products/usbprog/eusb3_top.gif, and the bottom at > http://www.embedinc.com/products/usbprog/eusb3_bot.gif. Olin, Is that directly output from Eagle as GIF? I like the addition of the scale= s! Josh --=20 A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. =A0 =A0 =A0 =A0 -Douglas Adams --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .