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Question about Capacitors

Discussion in 'Electronic Components' started by K2LRV, Oct 21, 2008.

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  1. K2LRV

    K2LRV Guest

    OK here is a question that I have never seemed to find some at least
    good guidelines on. What type of capacitor to use, i.e. electrolytic,
    tantalum, ceramic, etc.
  2. Rich Webb

    Rich Webb Guest

  3. DJ Delorie

    DJ Delorie Guest

    Don't use ceramic with high ripple currents, if you want them to be
    quiet. They can act like tiny piezo buzzers. I used a big
    electrolytic with a smaller tantalum in that case, no noise at all.
  4. Eeyore

    Eeyore Guest

    Oh God !

    Buy a book !

  5. Eeyore

    Eeyore Guest

  6. Eeyore

    Eeyore Guest

    Ceramics are NEVER used with high ripple currents you brain dead

    Go away and die.

  7. DJ Delorie

    DJ Delorie Guest

    Wow, someone's off his meds again.
  8. Jamie

    Jamie Guest

    Oh really..

    Tell that to the military customers that required us to
    test the ripple currents on ceramic caps back when I was at
    We didn't actually make the ceramic material there how ever, we did
    complete the rest of the cap's structure.

    The main line was mica epoxy dips with very high Q.

    Think before you speak!, not every one makes only audio circuits."
  9. Eeyore

    Eeyore Guest

    Provide an example of a ceramic caps with high ripple current before
    talking out of your arse.

  10. Eeyore

    Eeyore Guest

    Mica caps with very high ripple currents ?

  11. DJ Delorie

    DJ Delorie Guest

    That would go against my original recommendation.
  12. DJ Delorie

    DJ Delorie Guest

    That is, providing an example of ceramics used in a
    high-ripple-current situation would go against my original
  13. Is that the real Graham Stevenson or a forgery ? The Path: looks
    genuine to me.
  14. Jamie

    Jamie Guest

    You absolutely do not know what you're talking about..

    Stop embarrassing your self and move to a different subject.

    By Eye-Sore."
  15. Eeyore

    Eeyore Guest

    Please post ripple current ratings for mica caps.

    I look forward to seeing one that can handle say 10A !


  16. Eeyore

    Eeyore Guest

    It's genuine.

    Anyone who thinks you use ceramic caps as reservoir caps needs their
    brain examined.

  17. Jamie

    Jamie Guest

    Don't mind the Ham, I mean Graham, he's living in the audio world only.

    I think anything above 50 Hz is challenging to him.

    Btw, we used 1 Mhz signals in faraday cages at various levels of power
    to test ripple currents..

    1 Mhz was also the freq used in most of the other test."
  18. Phil Allison

    Phil Allison Guest


    ** The " ripple current" rating matters whenever ANY capacitor is passing
    significant amounts of current - such that its ESR causes it to self heat.
    Cap makers do not publish ripple current figures for all types, but usually
    do publish ESR values and curves from which the amount of self heating can
    be calculated - at least approximately.

    Ignore this at your peril - eg:

    The common X cap for mains suppression is well designed for its job, with
    250 volts AC at 50 or 60Hz - but what say if you apply that same voltage
    at 10kHz ??

    Answer - it smokes and explodes.

    ...... Phil
  19. Eeyore

    Eeyore Guest

    Can you be more specific ? At medium HF, polypropylene is a good dielectric to
    use and since values tend to be lower at HF, not a problem size wise. I've put
    8-10A though a relatively small polyprop cap.

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