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grind off solder mask to get down to copper

Discussion in 'Electronic Repair' started by Werty, Feb 20, 2007.

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  1. Werty

    Werty Guest

    Whats the chemical to take off the

    solder mask , so i can solder to tiny

    PCB traces ? I guess some acid that

    wont harm copper .

    Im Hacking the connector on a

    game box "GP2X" .

    I want my own , more robust connector

    where all the USB lines are heading off

    board in same direction .

    mail is

    x-x-x-x-WERTY-x-x-x-AT-x-x-x-x-x-
    x-x-x-x-S_W_I_S_S_I_N_F_O-x-x-x-x-
    x-x-x-x-ORG-x-x-x-x-

    BTW im also doin ARM 7 mcu's .
    Ill hook up a $44 ARM7 with USB
    as a "peripheral" to control KB
    and LCD , and pass on important
    stuff to a central ARM7 . I test
    code on the first ARM 7 , so
    the central 7 , can't crash .
    Central ARM 7 can boot the other
    in milliseconds .
    I will use low cost LCD ,BW , $10
    from BG Micro .
    This project is unique , because it
    will never use text . There will be
    icons and images on the LCD to
    show you what is happening .
     
  2. Guest

    metal scourer or blade.
    no such thing


    NT
     
  3. Arfa Daily

    Arfa Daily Guest

    I agree with meow. It is very difficult successfully hand soldering to
    genuinely tiny traces, but I guess it depends what you and I define as "
    tiny ". I'm talking traces of less than a half milimetre, separated by a
    similar amount. I always use a scraper to remove the solder resist. I have
    an Exacto scalpel with a blunt curved blade fitted for the job. I then
    liberally tin the exposed copper tracks, and then solder-mop them back flat,
    before soldering the new wires on, using a tiny amount of liquid flux, and
    the finest gauge solder that you can get. The flux gives serious help with
    getting the solder to stay *on* the tracks where you want it, rather than
    flowing *between* them, where you don't ...

    When I've finished, I usually put a small bead of two-part epoxy in a line
    across the new conductors, back a short distance from where they are
    soldered, to offer a bit of mechanical strength, as the tiny tracks will
    lift if they get the slightest pull from the new wires.

    Arfa
     
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