Jim If you put power and ground on the outside of the board; What happens when you have to re-work the signal layers ? (Not that signal layers always require re-work) Good Luck M Keel San Diego -----Original Message----- From: Jim Mathis [mailto:[log in to unmask]] Sent: Tuesday, October 26, 1999 7:32 PM To: [log in to unmask] Subject: [TN] 4-layer vs 2-layer costing Assuming all other considerations being equal (size, # of holes, hole sizes, etc.), what is the typical cost adder for going 4-layer from 2-layer? 1.5X, 2X. etc? Also, in an EMI-sensitive environment, how would you recommend the layer stack-up? Signal 1, Ground, Supply, Signal 2 OR Ground, S1, S2, Supply? OR something else? Thanks. ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ############################################################## ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################