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Banana plugging question...

Discussion in 'Electronic Design' started by Don Lancaster, Jul 12, 2006.

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  1. Just received a bunch of genuine E.F.Johnson dual banana plugs and
    cannot figure out how the wires are supposed to attach.

    Par number is 108-0201-001.
    A temporary image should be at
    http://www.tinaja.com/images/bargs/efj2bp01.jpg

    There are only three parts: A plastic case that does in fact have D
    clearance holes for input wires, and two threaded combination plugs and
    jacks.

    There seems to be ZERO provision for connecting anything.
    Or any room for wires to go to. Or anything to clamp wires to.

    Yet this is obviously a mainstream product still available surplus.

    Help....


    --
    Many thanks,

    Don Lancaster voice phone: (928)428-4073
    Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
    rss: http://www.tinaja.com/whtnu.xml email:

    Please visit my GURU's LAIR web site at http://www.tinaja.com
     

  2. Do the bannna pins turn? They have a hex nut machined into them that
    would appear to serve no other purpose.


    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
  3. Rick

    Rick Guest


    If you push down hard on the plastic case will it slide and then lock
    into place?
     
  4. John Fields

    John Fields Guest

     
  5. Ah yes, the Viking helmet icon folks.

    Did you know the city of Baghdad was named after a Viking?
    After the fall of Rome and Constantinople, there was a bit of a power
    vacuum in the Middle East, so much so a bunch of wandering Vikings
    kinda took over the place.

    But I digress.


    Maybe you can unscrew the pins and slip a wire in somehow?


    Or then again I've seen some like these, unmarked in any way, but
    they're just shorting plugs.
     
  6. If they are like the old Philips type, they have a clutch in the top.
    Turn the hex nut anti clockwise to release the clutch. Insert the wire,
    turn clockwise to lock the clutch on the wire.

    --
    Regards,

    Adrian Jansen adrianjansen at internode dot on dot net
    Design Engineer J & K Micro Systems
    Microcomputer solutions for industrial control
    Note reply address is invalid, convert address above to machine form.
     
  7. I can't seem to find anything like CCW clutches or places to put a
    screwdriver.

    The plastic part is threaded. The contacts appear to be one piece that
    screw into the plastic part. There are no sideways holes in the
    contacts. Only the top hole that seems to want to accept a stacked plug.

    Turning the pins upside down does not seem to help at all.

    Still mystified.

    This HAS to be a standard part with a simple answer.



    --
    Many thanks,

    Don Lancaster voice phone: (928)428-4073
    Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
    rss: http://www.tinaja.com/whtnu.xml email:

    Please visit my GURU's LAIR web site at http://www.tinaja.com
     
  8. You unscrew each plug and wrap a stripped conductor around the smooth
    section (above the hex part and below the threads). You then screw the
    plug back in and the wire is held in by being pinched between the plug
    and the plastic housing.

    You have to strip the wire based on a little trial and error. If the
    strands are thin, it might take a couple of turns around the plug to
    provide a tight grip. Otherwise strip enough to make one turn.
     
  9. Rich Grise

    Rich Grise Guest

    Show us more pictures from other perspectives - you might have to solder
    the thing. The notches in the plastic at the shoulder of the plug thingies
    look suspiciously like they're intended to accomodate leads.

    Good Luck!
    Rich
     
  10. Thank you.

    I pretty much figured the same thing out at 3AM last night.

    Only I believe the strands have to go between the plastic threads and
    the metal ones.

    I guess what I would really like to see are the EXACT instructions from
    Johnson over what size wires work and how to properly prepare them.

    Not clear how this would work with a lot of test leads you might like to
    attach. Such as coax.

    --
    Many thanks,

    Don Lancaster voice phone: (928)428-4073
    Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
    rss: http://www.tinaja.com/whtnu.xml email:

    Please visit my GURU's LAIR web site at http://www.tinaja.com
     
  11. Don Lancaster wrote:

    Maybe there were patents on such tremendously non-obvious ideas like
    having setscrews to hold the wires as in Pomona or WE plugs, or
    wrapping the wire around the plug body., like those cheap 60's plugs,
    or....
     
  12. Rich Grise

    Rich Grise Guest

    We used to have jumper cables with those dual banana plugs/jacks, and
    attached the wires with the setscrews at the bottom of the jack holes.
    Even coax isn't so bad: you can either tease open the braid and pull
    the center conductor through, or just comb the braid out - in either
    case, it's easy to twist it together and tin it.

    Cheers!
    Rich
     
  13. qrk

    qrk Guest

  14. joseph2k

    joseph2k Guest

    There should be little set screws accessible with a small screwdriver from
    the opposite end from the banana contacts.
     
  15. joseph2k

    joseph2k Guest

    Considering patents have only 20 years life these must be 20 years dead.
     
  16. Nope. no set screws.
    Apparently you just mash the strands into the plastic and screw the plug
    part in.

    --
    Many thanks,

    Don Lancaster voice phone: (928)428-4073
    Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
    rss: http://www.tinaja.com/whtnu.xml email:

    Please visit my GURU's LAIR web site at http://www.tinaja.com
     
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