Island Labs has a free 75 page book on PCB layout: http://www.islandlabs.ca/images/stories/EMC_Reference_Material.pdf?goback=.gde_1784463_member_139347361 Emphasis is on EMC, but many EMC problems are symptoms of SI problems. It's all useful. ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List forum is accessible at: http://tech.groups.yahoo.com/group/si-list List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu