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Is this jack wired correctly?

Discussion in 'Electronic Basics' started by Ken, Dec 2, 2004.

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  1. Ken

    Ken Guest

    Please see J4 for a TenTec RX-320HF receiver -- copied from the TenTec
    web site:
    http://home.att.net/~cprstn54/J4.JPG

    Am I right that this a a stereo jack with the mono signal on ring?

    If so, why would anyone wire up a jack this way? A mono plug would
    short the signal to ground.



    Ken
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  2. Dbowey

    Dbowey Guest

    Ken posted:

    << Please see J4 for a TenTec RX-320HF receiver -- copied from the TenTec
    web site:
    http://home.att.net/~cprstn54/J4.JPG

    Am I right that this a a stereo jack with the mono signal on ring?

    If so, why would anyone wire up a jack this way? A mono plug would
    short the signal to ground.
    The jack is a standard tip, ring, sleeve jack, and the configuration looks
    good.

    The real question is: Why would someone put a "tip and sleeve plug into it,
    when it *clearly* is intended for a tip, ring and sleeve plug?

    Don
     
  3. Ken

    Ken Guest

    Well, one reason is that the jack is labelled "Speaker" and not
    "Speakers" and it is a mono radio. It's not like you can look down
    the hole and see what's what.


    Ken
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  4. tempus fugit

    tempus fugit Guest

    Could it somehow disconnect the main speakers? You know, like the older
    stereos where you plugged in headphones and they automatically cut the main
    speakers.
     
  5. Ken

    Ken Guest

    There is an independent LINE-OUT with a lower amplitude version of
    this signal fed to tip and ring of a separate stereo jack, with 100
    ohm resistors on each leg. This is a common technique that
    accommodates a stereo or mono plug.

    The presence of the LINE-OUT jack wired so competently makes the
    SPKR-OUT wiring especially puzzling.

    Ken
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  6. Rich Grise

    Rich Grise Guest

    Oh, then it just means that it was cheaper for them to use the same jack
    that they use in their stereos, but only wire it up for mono, than to
    specify a different jack only for mono.

    If it's a mono unit, the "ring" wouldn't be connected, which your diagram
    seems to indicate, ass-u-me-ing that "X" means "no connect".

    Cheers!
    Rich
     
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