'William Chops" Westfield ' If you can make > it work by adding extra layers with power planes, that ends up being > cheaper (at moderate quantities) than figuring out how to get it > working without the "extra" layers. What I do a lot with 2 layer boards is to try to keep the bottom layer as a ground plane. Most of the connections are on the top layer, and the bottom layer is used sparingly for short "jumpers". The Eagle autorouter can help with this by setting the cost of running in the bottom layer high. Actually I set the cost in polygons high and use a polygon for the mostly-ground layer. Unfortunately there is no way to explain to Eagle that the important criterion is the maximum dimension of any island it creates in the bottom layer. It tends to clump the jumpers together, even with hugging set to 0. After the autorouter finishes, I manually move things around a bit to minimize the size of each island. Lot= s of little jumpers isn't so bad as long as the ground can flow around them. One big jumper however becomes a slot antenna. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .