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reading a capacitor

Discussion in 'Electronic Basics' started by lerameur, Sep 16, 2006.

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  1. lerameur

    lerameur Guest

    hello,

    I am trying to read a capacitor I just purchased from digikey. it says
    on the package 22PF ceramic 5%. But when i look at it, i read 22J. I
    thought 22J was read 22uF, this is using information from thjis web
    site
    http://www.uoguelph.ca/~antoon/gadgets/caps/caps.html
    right under figure2, where it says: Other capacitors may just have 0.1
    or 0.01 printed on them. If so, this means a value in uF. Thus 0.1
    means just
    0.1 uF. If you want this value in nanoFarads just move the comma three
    places to the right which makes it 100nF.

    I dont think digikey would make a mistake, would they ?

    thanks for clearing that

    ken
     
  2. Tom Biasi

    Tom Biasi Guest

    Hi Ken,
    I'm not sure what you are seeing. 22 J is a 22pF at 5%. The J means 5%, 22
    with no other markings is in pF.
    Not likely Digikey would make that mistake.
    Sometimes capacitor markings can be confusing.
    Tom
     
  3. A 22 uF ceramic would be a honking big SOB.
     
  4. Eeyore

    Eeyore Guest

    Why exactly was that ?

    Graham
     
  5. Ban

    Ban Guest

    If you read on a few lines down, it says about NP0:
    ....or it may say N12 which translates to 120pF. Or 2p2 (2.2pF). I'm sure you
    get the idea...
    another indication of NP0 ceramics is a black stripe. They are all small in
    value, Tony says up to 120pF.
    So your interpretation was erraneous. And this is the dilemma with learning
    from web pages. You might understand something else and then -no feedback as
    in school is possible. If you already have some basic experience with
    components, you would immediately know, that a 22uF is much bigger.
    There is also the possibility to go to the Digikey website, get the
    datasheet for your capacitor and check for the printed designator, wow!
     
  6. Alan B

    Alan B Guest

    You've misread that site. From its "Figure 2" and the accompanying
    description, it is clear that it says a cap labeled "22J" is 22pF 5%.
     
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