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AAAARRRRGH! #28 stranded ribbon-cable wire -> protoboard? Hah!

Discussion in 'Electronic Basics' started by Rich Grise, Feb 3, 2006.

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  1. Rich Grise

    Rich Grise Guest

  2. why not solder all of them in a line across a piece of solid wire, and
    plug the two ends of than into the proto board?
     
  3. Roy L. Fuchs

    Roy L. Fuchs Guest


    Naaaahhh... that would be too much like the way that the rest of the
    world does it... :-]
     
  4. Chris

    Chris Guest

    Hi, Rich. Let's assume for the sake of discussion you have a 20-pin
    ribbon cable. Here's what I've done in the past, after looking at this
    same depressing problem too many times:

    1) Terminate your ribbon cable with an IDC connector.

    2) Scrounge a piece of perfboard at least as wide as the IDC
    connector, with three hole-per-pad layout. Cut the perfboard so the
    dividing line between two lines of pads runs down the middle laterally.

    3) Using 24AWG wire, jumper across from one line of pads to the other,
    leaving the closest holes on each side of the dividing line open (in
    the diagram below, the jumpers go from the top "X" to the bottom "X").
    Have the jumpers extend a few tenths of an inch down from the bottom
    side of the board.

    4) Solder the jumpers onto the perfboard. Now, using sheer cutters,
    cut the jumpers off flush at the top of the board. You should have two
    lines of leads coming down from the solder side of the perfboard.

    5) Now, solder in a mating IDC receptacle on the perfboard. In the
    diagram below, it should be in the holes marked "o".

    1 19
    .---------------------.
    | X X X X X X X X X X --Jumper Leads
    | | | | | | | | | | | |
    | o o o o o o o o o o |
    | \ IDC receptacle
    | o o o o o o o o o o /
    | | | | | | | | | | | |
    | X X X X X X X X X X --Jumper Leads
    '---------------------'
    2 20 \
    \ Perfboard
    (created by AACircuit v1.28.6 beta 04/19/05 www.tech-chat.de)

    You now have an IDC connector you can easily insert into a protoboard,
    0.3" spacing just like a thru-hole IC, and you can automatically plug
    one end into a bussed line of the protoboard to have your interleaved
    GND.

    I've got a few of these lurking around, and dig them up when I need
    them for ribbon cable to protoboard work (if you take care of them,
    you'll only have to make them once).

    Glad to 'ave been of 'elp, sir. Again, thanks for "coming down from
    heaven" to enlighten us groundlings. Always a pleasure.

    And "keep up the skeer" on s.e.d. ;-)

    Chris
     
  5. Robert Baer

    Robert Baer Guest

    With ribbon cable, one could use an IDC connector, and all of the
    even numbered wires are then on one row and the odd numberes wires are
    on the other row...
     
  6. Rich Grise

    Rich Grise Guest

    I had thought of that, but when I tried to set it up, whether one wire
    at a time or as a batch, it got to looking like a PITA, so I decided to at
    least give the protoboard a shot. But the little #28 wires, even tinned,
    aren't stiff enough. I guess I'll have to do the soldering. :-/

    Thanks!
    Rich
     
  7. Rich Grise

    Rich Grise Guest

    Yeah, in fact, I'm exploiting that - the other end does have the IDC
    connector, and I'm plugging it into a single-row header. For the end
    in the pic, I don't have an IDC connector unless I take apart some old
    cable. And then I'd have to go from the IDC connector to the protoboard
    anyway. :)

    Thanks,
    Rich
     
  8. Rich Grise

    Rich Grise Guest

  9. Roy L. Fuchs

    Roy L. Fuchs Guest

    Solder pins on the ends of them. OR tin them RIGHT, and insert them
    vertically, not bent as you show in the photo, THEN bend it over.

    The best way is to bus them on a bare copper strip, or WIRE, and
    insert a single wire into your vector board, etc.
     
  10. Rich Grise

    Rich Grise Guest

    The point was, I was trying to insert it vertically, but it bent under
    the pressure before it slipped between the connector's labia. ;-)
    It's OK - I've got them all inserted now, and am snitching 3.3V power
    from the development board that this will be plugging into. A certain
    client lent me a Xilinx XC9572XL development board and software, and
    I've been itching to find an excuse to get into it - The part of the
    client's project this was suppposed to be for got either back-burnerized,
    superseded, or he's waiting to see what I can do with this thing before
    he actually gives me the assignment. :) I'm a little hampered lately,
    because I only have the one computer and the Xilinx stuff only runs on
    Windows, unless maybe Wine, but that's a whole nother project in itself.

    Thanks!
    Rich
     
  11. Ben Jackson

    Ben Jackson Guest

  12. Carl Smith

    Carl Smith Guest


    If you are going to do some programming of Xilinx CPLDs and you
    try their version ISE 7.1 software for Windows, MAKE SURE you
    also install the service pack updates to get to 7.1.04. There
    is a bug in the 7.1 version that causes the CPLD outputs to be
    inverted. Xilinx has a page somewhere that explains this
    problem, but the only way to find it is to already know that the
    problem exists. They have no notice on the download page for
    7.1 that you need the 04 update if you are using CPLDs.

    Or you could try the new version 8 software, but who knows if
    that actually works either.

    I found out about this when I recently programmed a XC9536 to
    control a stepper motor, and I couldn't figure out why the
    output sequence was wrong, even though it worked perfectly in
    simulation. So I figured I'd try something simple and just put
    a 4 bit counter in. It counted in some weird sequence where
    every second number was inverted and off by one. Because of the
    inversion problem the counter would take the current output, add
    one, then invert that and put it out on the pins. Next time it
    would do the same thing. So it was right half the time. I only
    figured out the problem after posting to comp.arch.fpga and
    someone there knew about it.

    By the way, I thought Xilinx had a linux version of ISE. I seem
    to remember people on comp.arch.fpga discussing how to get the
    parallel download cable and their programming software working
    on linux...

    Carl
     
  13. Roy L. Fuchs

    Roy L. Fuchs Guest

    You use retarded terms in your technical discussions. You gotz
    issues. If you want to be technical, be technical. If you want to be
    an adolescent idiot that claims to be technical, it won't ever work...
    EVER.

    A properly tinned 28 ga wire will insert in such locations just
    fine. If the wire is ten years old, and doesn't even accept a tinning
    correctly, you will see it fold under stress. If it is a new wire,
    then your soldering skills need honing, and the sexual comics need to
    be extricated. They are muddling your mind.
     
  14. Roy L. Fuchs

    Roy L. Fuchs Guest

    It is hard to believe that someone that refers to cinch actuators as
    "labia" can actually understand and maintain a Linux computer.

    What you need to do is get a dual boot machine set up. Away go all
    platform dependent problems at that point.
     
  15. John Fields

    John Fields Guest

     
  16. Rich Grise

    Rich Grise Guest

    I'm glad I heard about this - I did install their latest service pack, but
    don't know if it's 7.1.04 or not - I'll have to check.
    Not Me! ;-)
    I guess I'll have to spend some time lurking there.

    Thanks!
    Rich
     
  17. Rich Grise

    Rich Grise Guest

    What a bunch of tight-asses! Lighten up a bit - it's a _hobby_ project!

    Sheesh!

    Thanks!
    Rich
     
  18. Rich Grise

    Rich Grise Guest

    Ah, there are more things in Heaven and Earth than are dreamed of in your
    philosophy, Horatio. ;-P
    I not only have a dual-boot machine set up, but when I boot Windoze I've
    got myself cut off from the internet so I don't get viruses and crap.

    So I can only do either-or, currently.

    And why do you have to be so huffy about it?

    Thanks,
    Rich
     
  19. ian.field1

    ian.field1 Guest

    Labia is the plural of labium, meaning a lip or lip like structure - it is
    only a sexual reference when used in a sexual context.
     
  20. Wim Lewis

    Wim Lewis Guest

    Yup. Although I usually hear those springy metal bits called "fingers"
    or "leaves", neither of which is cognate with labia, I had no trouble
    understanding Rich's post...
     
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