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Placing connector on AC/DC Adapter

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Discussion in 'General Electronics Discussion' started by jstroming, Sep 18, 2010.

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  1. Sep 18, 2010 #1
    jstroming

    jstroming

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    Sep 18, 2010
    There is something that has been perplexing me for some time, and hopefully someone can give me an answer on this.

    I have an AC adapter (Sharp UADP-A044WJPZ) that I am trying to add a connection on the wire between the brick and the DC plug. Check out the attached image. Basically I cut the wire close to the brick, added a 4-pin female Neutrik chassis connector to the bit of wire remaining on the brick, and added another 4-pin male plug to the other side of the cut wire. I thought this was a basic task of picking a pin on the connector for each of the 4 leads in the wire, and making sure it matched on the other connector. Turns out I get NO power to the sharp aquos 13" TV.

    I tried this years ago with a Yamaha audio mixing console and had the same results, couldn't figure it out.

    Am I missing something important here that I just don't know about? I am not by any means an electronics master (obviously) but do my (very) fair share of a/v wiring and A/C electrical wiring and don't have these problems ever. I thought the voltage might be dropping, but I am not cutting the length of the wire at all, just adding maybe an inch or two of distance for the power to travel with the addition of the connector. I checked the connector, and have no shorts. Also I did check the power supply before I ripped it apart and it worked fine when it was in one piece. Please help!

    Many Thanks in advance!
     

    Attached Files:

  2. Sep 18, 2010 #2
    (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,499
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    Jan 21, 2010
    OK, several issues.

    1) make sure you don't connect either power wire to a connection that leads to the chassis.

    2) I would recommend you use connectors the same as are already used on the power adapter so you don't confuse people (what if someone confuses connections and connects it to a microphone input?

    Other than that, if you connect the right wires up, it should work.

    Use a multimeter to confirm that the pins you've selected actually connect. A not-uncommon error is to forget that both connections are mirror images leading to incorrect pins being used or things being wired up backwards.
     
  3. Sep 19, 2010 #3
    shrtrnd

    shrtrnd

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    Jan 15, 2010
    Yeah, and I've seen manufacturers use-up their old stockpile of left-over parts from previous production runs (like connectors with more pins, than their latest production run needs). So it sometimes happens that you get a 4-pin plug, when all you need is 2 or 3 pins in the model you have.
    Sometimes, I've felt like they used 4-pin connectors, just because the plug fits more snuggly, than if they used a two, or if needed 3-pin device. Come to think of it, how often does one FIND a 3-pin device. Manufacturers, would probably use a standard 4-pin connector, even if they only USED 3 pins.
     
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