Connect with us

grind off solder mask to get down to copper

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

Scroll to continue with content
  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


    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

  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.

Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day