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progressive wiring: SMT part with normal protoboard...

Discussion in 'Electronic Basics' started by Ozone Hole near South Pole, Sep 15, 2004.

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  1. I have just come across this page that describes the progressive
    wiring technique.
    http://elm-chan.org/docs/wire/wiring_e.html

    The author managed to build an MP3 player using a normal prototype
    board, with mostly SMT parts, some ICs are as complex as 48 LQFP. The
    trick is to connect the parts with thin enamel wire one by one. It
    seems to be a very attractive option as I don't have room in my flat
    to setup a PCB tank and want to avoid spending money to make the PCBs
    professionally.

    The technique seems to be very good, but, it does not seem to be a
    common technique when I search the web. I wonder if anyone has
    experience with this. Also, the polyimide (Kapton) tape mentioned in
    the article is hard to locate in my town. Any alternative solution for
    that?
     
  2. Dave Garnett

    Dave Garnett Guest

    It works up to a point. You need ~ 350C to melt the covering quickly, but if
    you apply 350C to the leads of many SM parts, damage will result ! If you
    scratch the covering a bit, then a soldering iron at ~260C will enable you
    to tin wires and make joints - but it takes much longer.

    The other key point about this and similar techniques (wire-wrap for
    instance) is that you really need a ground plane for most of todays fast
    digital logic. You can buy proto boards with a collander ground plane, and
    these work well. Any significant wire length in a ground or power decoupling
    circuit is asking for Trouble.

    Finally, it is pretty fiddly to do, particularly when you need multiple
    connections to each pin. With my aging vision I always need to check my work
    under a low power microscope !
    D
     
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