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
##############################################################