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August 1998

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Subject:
From:
Jeff Seeger <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 7 Aug 1998 14:01:52 -0400
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.
        Welcome to the world of design, Jason!

        First, note that it is not called, "do".  It is called
        design for a reason.  I say this because you will find
        many sources asking you to "do this", sometimes in direct
        conflict with the last visitor.  You really need to find
        the common ground between these many sources to achieve
        a robust design.

        Second, let me throw this out - a Printed Board Design
        is a puzzle with 10,000 possible solutions, 100 of which
        will work and 4 of which are really good.

        Next, to help determine what works and what's good, you
        need to gather understanding of the various stakeholders
        in the product:

        Electrical issues
        Regulatory compliance issues
        Mechanical issues
        Thermal constraints
        Bare board fabrication issues
        Components assembly issues
        Board and Product test strategies
        Rework and Repair
        Documentation and revision control

        And, for your reward, if you can satisfy ALL the factions,
        you become invisible!   That is, the downstream players
        will all accomplish their goals without cursing you, and
        therefore not even notice you were there!

        Along the way you will undoubtedly get a blizzard of the
        "Design for This" and "Design for That" monikers.  My take
        (from 23 years in physical design) is that, well, to get
        to "true invisibility" you must unify all this stuff and
        try to "Design for Purpose".

        Among the many good suggestions you've gotten, let me add
        that the pertinent specifications from IPC are extremely
        useful in grasping not just "what to do" but will also
        give you a picture of "why" as well.  Check out the IPC's
        web site and prepare your management for a couple hundred
        dollars worth of specs.  They will be well worth it.

        Also look up the IPC Designer's Council, there may be a
        chapter in your area.  This group is dedicated to the
        development of designers and each chapter puts on some
        informal (and some a little formal) programs on a monthly
        or periodic basis.

        Best of luck,
--

      Jeff Seeger                         Applied CAD Knowledge Inc
      Chief Design Philosopher                 Tyngsboro, MA  01879
      jseeger "at" appliedcad "dot" com                978 649 9800

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