Hi technos, first I want to say to the Moonman "got your lean thing, as well as all the other documents you put there. Big thanks to you and Seth". Now, my question to the forum is: what are the rules in determining the diameter of vias? Has it anything to do with the current or the power? Can a power supply board, stepping down from 600V to 220V, have 0.018" vias? I know it sounds trivial, but I'm no EE. Thanks, Ioan --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------