capacitor circuit help

Discussion in 'The Projects Forum' started by markosillypig, Dec 23, 2013.

  1. markosillypig

    Thread Starter Active Member

    Jul 21, 2008
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    hi every one and merry christmas to all
    i'm making this circuit for a project
    pic attached but i'm not sure about the capacitors
    on the schematic they look like they show polarized caps on the finished pcb it shows tant caps can any one varify pz
    cheers
    all
    marko

    sorce http://chemelec.com/Projects/Sequencer/LED-Chaser.htm
     
  2. paulktreg

    Distinguished Member

    Jun 2, 2008
    612
    120
    Tantalum capacitors are polarized.
     
  3. markosillypig

    Thread Starter Active Member

    Jul 21, 2008
    184
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    oooops never notices that
    what a f***ing idiot i am
    thanks for that. will have a look at the ones i have
    i feel such a fool maybe thats why some of my circuits never worked
     
  4. markosillypig

    Thread Starter Active Member

    Jul 21, 2008
    184
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    so where it says 35+ thet means that is the + side or are the dotted lines the - ?
     
  5. MaxHeadRoom

    Expert

    Jul 18, 2013
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    2,381
    Tantalum's are a bit confusing, the dotted line/+35 is the positive connection.
    In some case it is a continuous line.
    Max.
     
  6. RichardO

    Well-Known Member

    May 4, 2013
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    Begin Rant

    <
    ALL capacitor markings are confusing -- Sometimes thy don't bother to mark them at all.
    >

    end Rant
     
  7. paulktreg

    Distinguished Member

    Jun 2, 2008
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    If they are polarized then they ARE marked.
     
  8. MaxHeadRoom

    Expert

    Jul 18, 2013
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    In some cases they are marked even non-polarized as in small value decoupling capacitors to ensure the outer plate/foil is connected to common, similar reason in the case of very high voltage types.
    Max.
     
  9. THE_RB

    AAC Fanatic!

    Feb 11, 2008
    5,435
    1,305
    And sometimes the only polarity marking is a tiny + symbol that is so small and fine as to be almost invisible without a magnifier. :(
     
  10. RichardO

    Well-Known Member

    May 4, 2013
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    Of course, you are right. If I am going to rant then I should at least rant accurately and coherently -- I was thinking more about value markings when I wrote that. Most surface mount ceramic caps are not marked with a value at all.

    p.s. Does anyone remember the old caps that used 6 dots?


    -- Richard
     
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