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Help with polarity

Discussion in 'Electronic Basics' started by Stephen Shauger, Aug 19, 2003.

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  1. I would appreciate help with a problem.

    I am trying to install a "CD to Cassette Adapter" and a "Portable CD
    Power Adapter" to my car which has a tape deck.

    The Power Adapter (Phillips #72488) says to set the polarity on the
    plug so that the word tip lines up with either the "+" or the "-" if
    the polarity of the portable CD player's polarity is positive or

    My portable CD player (Sony Discman D-111) has center-point positive
    polarity. I.e. the diagram looks like this.

    + ---0)--- -

    So my question is: Is "center-point positive" the same as "positive"?
    In other words, when the instructions on my power adapter refer to
    positive polarity, are they refering to the center point or to the
    outer wall.

    Please reply to email

    Thank you so much for your help.

  2. Yes. It is exactly what it says. The center is positive. The wall is


    Chip Shults
    My robotics, space and CGI web page -
  3. JeffM

    JeffM Guest

    So my question is:
    Everybody needs to start using the same terminology.
    On a 1/4" phone jack, starting from the center,
    it goes tip, ring, sleeve.
    On smaller phone jacks, too small for 3 elements,
    it's tip, sleeve.

    I've never heard a standard call-out on coaxial connectors
    which have a hollow center on the male plug.
    I say center conductor, sleeve.

    "Wall" is never used.

    That said, things are generally referenced from the sleeve,
    since it is most likely to touch the chassis or "ground".
    So, yes, you called it right.
  4. Rich Grise

    Rich Grise Guest

    (Stephen Shauger) wrote in message
    One way to find out for sure is with a voltmeter. :)

  5. I think you are analyzing this WAY too hard. Positive is positive, period.
    There is only one center point. It can only be negative or positive.


    Chip Shults
    My robotics, space and CGI web page -
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