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Capacitor polarity -- how to tell with confusing markings?

Discussion in 'Electronic Repair' started by larry moe 'n curly, Jan 30, 2006.

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  1. Damir

    Damir Guest

    It looks like coils, not el.caps.
  2. Dave D

    Dave D Guest

    They look like tantalum caps to me.

  3. Damir

    Damir Guest

    Maybe.But too few colors for capacity,polarity and voltage rate.
  4. Don't even think of using them.

    They're dipped-tantalum capacitors. The positive lead is the one with
    the dot.

    Problem is, these tend to fail hard and often. They short out all the
    time. Either at random or just after a mild overvoltage incident.

    And the color codes are hard to interpret.

    Which is good for repair guys like me-- I've bought dead oscilloscopes
    and calibrators for like $5. Only problem was one to seven shorted
    caps, just like the ones you pictured.
  5. Gerard Bok

    Gerard Bok Guest

  6. Jason D.

    Jason D. Guest

    Wow! That's very old caps! These design of paint on them dates from
    60-70's. In 80's started to use blue, orange or yellow monochrome dip
    with printings on it. The latest caps for disk, SMD and drop packages
    are now printed with laser etching.

    By the way, taluam caps don't take very kindly to long storage. Some
    may blow up or short out when power applied to them.

    Cheers, Wizard
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