Thanks for that simple explanation Jerome. Does that mean that a 4 layer board is really 2 * two layers plus an insulator between and then when each pair of layers has been etched, the board is 'glued' together? I mean, it would be difficult to etch out the tracks in the middle two layesr otherwise :o)
Thanks again, Norman. ------------------------------------- Norman Dunbar Database/Unix administrator Lynx Financial Systems Ltd. mailto:[EMAIL PROTECTED] Tel: 0113 289 6265 Fax: 0113 289 3146 URL: http://www.Lynx-FS.com ------------------------------------- -----Original Message----- From: Jerome Grimbert [mailto:[EMAIL PROTECTED]] Sent: Friday, January 11, 2002 12:04 PM To: [EMAIL PROTECTED] Subject: Re: [ql-users] Q40/Q60/??? Ultra IO card Well, you can also have track inside ! Think of the board as a sandwich. There is two side per slice of bread. Therefore, you can have the simple sandwich: 1 slice of bread, 2 layers. There is also a sandwich with 2 slice of bread (separated by your favorite ham): 4 layers. Things like big-mac, with 3 slice of bread: 6 layers! and so on. Of course, the more layers, the more expensive to manufacture!!! Therefore, a manual routing with 4 layers is far better than autorouting with 6 layers! This email is intended only for the use of the addressees named above and may be confidential or legally privileged. If you are not an addressee you must not read it and must not use any information contained in it, nor copy it, nor inform any person other than Lynx Financial Systems or the addressees of its existence or contents. If you have received this email and are not a named addressee, please delete it and notify the Lynx Financial Systems IT Department on 0113 2892990.
