Hi Franklin
Sorry I did not express my point clearly.
My aim is to avoid SCRAP.
I hate scrap more than . . . (insert your favorite thing you really, really
hate here)
For example:
a board can be fully functional
THE PERFORMANCE REQUIREMENTS CHANGE (evolve)
(why didn't you do it the way I wanted, instead of the way I told you)
we want options.
TIME MONEY MONEY TIME TIME MONEY MONEY TIME TIME MONEY MONEY TIME
TIME MONEY MONEY TIME TIME MONEY MONEY TIME TIME MONEY MONEY TIME
now I have a question for you
is time money one thought or two ?
-----Original Message-----
From: Franklin [mailto:[log in to unmask]]
Sent: Tuesday, October 26, 1999 8:36 PM
To: [log in to unmask]
Subject: Re: [TN] 4-layer vs 2-layer costing
Mike,
Just a thought here, would it be best to design a board for proper
functioning during it's end use, or to make it easier for the fabricator or
assembler (i.e. easy access to areas that may require rework)
I'm of the opinion design input should never result correctable conditions
in the output, i.e. don't design band-aids into boards.
And this coming from someone at a board house, whats this silly world coming
to.
Just a thought is all.
Franklin D Asbell
Network Circuits, Inc.
Irving, Texas
-----Original Message-----
From: Keel, Mike < [log in to unmask] <mailto:[log in to unmask]>
>
To: [log in to unmask] <mailto:[log in to unmask]> < [log in to unmask]
<mailto:[log in to unmask]> >
Date: 26 October, 1999 2:01 PM
Subject: Re: [TN] 4-layer vs 2-layer costing
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]
<mailto:[log in to unmask]> ]
Sent: Tuesday, October 26, 1999 7:32 PM
To: [log in to unmask] <mailto:[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.
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