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New Guy Here Need Help -SOLVED!- identifying negative lead of these old Nichicon electrolytic caps.

Discussion in 'General Electronics Discussion' started by Hadar, Apr 7, 2016.

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  1. Hadar

    Hadar

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    Apr 7, 2016
    These radial caps have no stripe or markings indicating which side the negative lead is.(or if they are marked I don't know how to read them) I see on the one side it says N P N which is indicative of transistors but I gotta go with my gut and say that these are no doubt electrolytic caps. They date to the late 70's. Does anyone know how to ID them? Thanks in advance. (for the cap in the middle marked C11)

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  2. duke37

    duke37

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    769
    Jan 9, 2011
    There is a dark blue stripe with an arrow and negative sign pointing to the negative end. See the first picture.
    Also in the second picture, there is an arrow pointing away from the positive connection.
     
  3. Hadar

    Hadar

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    Apr 7, 2016
    Hello and thanks for the reply. I am aware of how to read caps that are striped like you stated. The problem is with the center cap in the pics. I took pics of both sides and there is no clear stripe on that particular cap. I can't read the cap marked C11 on the board.
     
  4. dorke

    dorke

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    Jun 20, 2015
    Sure there isn't.
    This cap is an Electrolytic NP(marked on it).
    NP stands for No Polarity,
    they are often used in audio circuits and speaker crossovers.
     
  5. Hadar

    Hadar

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    Apr 7, 2016
    Thank You very much Mr Dorke. So It would be a bad Idea to put in a replacement cap that had a dedicated polarity? I'm guessing that I should try to source a NP electrolytic for it's replacement.
     
  6. dorke

    dorke

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    Jun 20, 2015
    Yes it would,get a NP type.
    You see the NPs are audio grade, while the polarized ones are DC grade(good for very low line frequency filtering).
     
  7. Hadar

    Hadar

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    Apr 7, 2016
    Thanks again. This is for an old 16mm film projector sound amp. So your right on the money with it being for audio.
     
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