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Help: Connecting Leads to Pins

Discussion in 'Electronic Design' started by Searcher7, Feb 10, 2007.

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  1. Searcher7

    Searcher7 Guest

    I am working on a project and want to incorporate some single row
    terminal blocks.

    I'm trying to figure out the best way to connect leads to the pins
    underneath and was wondering if anyone new of the existence of crimp-
    on female connectors that I might be able to use on the individual

    If not, someone suggested wire wrappping. I have no idea what this is,
    but if it represents a plausible way to connect wies to the terminal
    pins then I'd appreciate it if someone can direct me to a website/book
    that illustrates how this is done and lists all materials needed.


    Darren Harris
    Staten Island, New York.
  2. Fred Bloggs

    Fred Bloggs Guest

    There are single row IDC connectors that will push right on, but you
    have standard post sizes and spacings that must be adhered to, and your
    posts need to be long enough. You don't want to get into crimping
    because that usually involves requiring a $350 tool.
  3. mpm

    mpm Guest

    Underneath what?!

    I've used Ferruls before with Din-Rail style terminal blocks.
    (I probably spelled "ferruels" wrong, but try some variations.)

    Let's see, who makes terminal blocks:?

    Also, try Phoenix Contact, or just Google "DIN Rail terminal blocks"..
    There are plenty of vendors.

    If you're were thinking those little black screw-type things with the
    big metal screws, the tops of which are open to the world when wired
    up, that's a different type of "terminal block". But I suppose you
    could still use ferrules with them... The purpose of which is of
    course, wire identification, solid connections, and to help prevent
    wire breakage.

  4. Rich Webb

    Rich Webb Guest

    You have a mental picture of exactly what your problem is but,
    unfortunately, nobody else can see it. I can think of quite a few gizmos
    that could possibly be called "single row terminal blocks" and it might
    help to focus potential answers to the specific one that you have in
    mind. Could you post a link to someplace (like Digikey or Mouser or ...)
    that has a picture of it?
  5. Could you tell us the make and part number of the terminal blocks you
    are using? - a web link to a datasheet would be good. With that
    information, we would have a better idea of your problem

    Peter Bennett, VE7CEI
    peterbb4 (at)
    new newsgroup users info :
    GPS and NMEA info:
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  6. Searcher7

    Searcher7 Guest

    Most of the strips I have are simular to these: http://

    There are screws on one side and pins on the other.

    Darren Harris
    Staten Island, New York.
  7. Guest

    What is the diamter of the pins?

    Will 30 AWG wire be big enough for your signals?

    I would seriously look at wire wrap. You used to be able to buy the
    tool at radio shack, alas no more. The simple ones look like the odd
    man out of a set of jewler's screwdrivers, you put the stripped wire
    in the small hole in the bit and feed it up the slot, put the big hole
    over the pin, and twist to neatly wrap several turns of the wire. You
    can of course solder the result for extra security.

    The common "official" wire wrap pins are .025" square. The tool
    should take the circular diametrical equivelent of that and maybe a
    bit more or less. Designed for .100" pitch, but I've been able to get
    wires into 2mm connectors with care.

    Bigger versions did exist in a past era, but those would be very hard
    to source (I tried to make my own tool as a kid to recycle some 44 pin
    edgecard sockets from some NorPack racks)
  8. Searcher7

    Searcher7 Guest

    I searched eBay "wire wrap tool", but I really don't know what I'm
    looking at.

    I'll need to connect 18g to 22g leads to the pins. But I have no way
    of measuring the size of the pins, which are actually flat and also
    rounded at the point.

    Darren Harris
    Staten Island, New York.
  9. John Fields

    John Fields Guest

  10. Rich Webb

    Rich Webb Guest

    Why not use a double-row barrier strip like Photos/38770-0110.jpg
    instead of a kludgey solution (unless you're forced into MacGyver mode
    for some reason)? Then you can use proper ring terminals and have some
    assurance of long-term reliability.
  11. Searcher7

    Searcher7 Guest

    I have a difficult time soldering leads to fingerboards, so pins would
    be a nightmare.

    And I already have a huge number of single row terminal

    Anyway, I'm assuming there is no crimp-on connector solution for this?


    Darren Harris
    Staten Island, New York.
  12. Fred Bloggs

    Fred Bloggs Guest

    For that kind of terminal strip you use crimp on ring or spade
    terminals, the one size will do 18-22ga, then these go under the screws-
    did you think the screws were there for looks?
  13. Searcher7

    Searcher7 Guest


    You haven't read what I wrote.

    There are pins on the other side opposite each screw.......

    Darren Harris
    Staten Island, New York.
  14. Fred Bloggs

    Fred Bloggs Guest

    You're an arrogant little prig for someone who doesn't know anything. I
    just told you to stack your crimps with your precious "leads" on top of
    the damned screws where they belong. Get it?
  15. mpm

    mpm Guest

    Looks like a PCB-mount style to me. If the nameplate goes on top that

    I'll bet you could find some crimps to fit those pins. Just measure
    And if you wanted to, (and had enough access to them), you could
    solder the crimps too.

    I don't know about wire-wrapping 18-ga insulated on these??. Sounds
    like a headache.
    And as others have mentioned, I think it's OK to wire everything on
    top (using 2 spades or ring terminals). I'm reasonably certain these
    terminals are rated for more than one terminal under the screw, but if
    you need to check (like for UL Listing or something), then do so.

    Obviously with this approach, you would not use the pins underneath.

  16. John Fields

    John Fields Guest

    Actually, he wanted to know how to connect hook-up wire to the pins
    on the underside of the terminal block.

    I suggested that he solder them, but he said he couldn't because of
    some problem he has with knowing how to solder.

    A lost cause, I think.
  17. John Fields

    John Fields Guest

    You may be able to find some ferrules and a crimp tool which you can
    use, but be prepared to spend some big bucks if that's the route you
    want to take.

    You really do need to learn how to make harnesses and how to solder
    if this is going to be your profession.
  18. Rich Webb

    Rich Webb Guest

    What's on the bottom -- that is, are you working with an existing
    circuit board or are you sort of free to roll your own? If you can use
    your own layout, something like stripboard might be the ticket. Just
    solder as many connector blocks as you need, in parallel, and do all of
    the wiring to the top terminals.

    See for some examples that
    might work.
  19. Searcher7

    Searcher7 Guest

    I know what you said.

    And the fact that you think I'm arrogant because I don't want to do
    things your way, indicate that you are the arrogant one.

    If I can get the proper hole spacing, the intent is to use
    stripboard(or some material that I can drill the holes in myselfd) and
    stand-offs, so the leads to the pins will be permanent and out of
    sight underneath.

    On the screw side, where some spades might have to be stacked anyway,
    I may have to change out connections.

    Darren Harris
    Staten Island, New York.
  20. Searcher7

    Searcher7 Guest

    I still wouldn't know where to begin to look for whatever tool I'll
    need to do things that way.
    No, this is definitely not a profession for me. Just a project.

    Darren Harris
    Staten Island, New York.
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