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Electrolytic caps in series

Discussion in 'Hobby Electronics' started by Rheilly Phoull, Jun 22, 2005.

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  1. G'day All
    What are the rules or method to calculate the values of balancing resistors
    when using electros in series ??
     
  2. Phil Allison

    Phil Allison Guest

    "Rheilly Phoull"

    ** Forget it - just use caps that have a large margin in excess of the
    needed voltage.

    Eg - two 350 volt types applied to a 500 volt supply.

    The caps will very soon reach a mutual, acceptable agreement on what
    precise voltage suits their individual taste !!






    ............... Phil
     
  3. One day Phil Allison got dressed and committed to text
    Thanks Phil
     
  4. Mark Harriss

    Mark Harriss Guest


    Electros have a fairly wide value tolerance and corresponding
    leakage current variation, it's considered good practise to have
    a resistor across each capacitor so that a series divider chain
    is formed that swamps out the effect of leakage currents. If not
    then the individual voltages across the caps can be imbalanced
    to the point where the operating voltage of one of the electros
    is exceeded: I have seen it happen and the effect does exist.

    In Morgan Jones' book "Valve Amplifiers" he has a good description
    of what's involved but I've loaned my copy to a friend so I can't
    give an exact quote but there was some rule of thumb.

    This guy has it:
    http://www.jproc.ca/ve3fab/sercaps.html

    Regards
    Mark Harriss
     
  5. Phil Allison

    Phil Allison Guest

    "Mark Harriss"

    ** In fact it never does.


    ** Utter crap - if the actual max operating voltage is approached, cap
    leakage current dramatically increases.

    When there is a series pair of similar caps, the current flow MUST be the
    same through both caps - so the one with lower leakage immediately takes
    up the additional voltage. There is no problem at all as long as there is a
    total voltage margin of 30 %.


    ** Mark Harrarse is a wet behind the ears, 20 year old, Qld fascist prick
    with zero experience.






    ........... Phil
     
  6. Mark Harriss

    Mark Harriss Guest


    1. Please note that the localised "Phil Allison Effect" means
    that electronics behave completely differently in Phil's
    workshop than to the rest of universe.

    2. Also note that Phil is in disagreement with most respected
    texts on the subject.

    3. Also note that taking Phil's advice will cause problems
    down the track as the electrolytics age and dry out.
     
  7. Phil Allison

    Phil Allison Guest

    "Mark Harriss"


    ** Just another anonymous, gutless, neo-fascist, know nothing pile of sub
    human crap hiding under a rock somewhere in Brisbane.


    Joh would have loved him.




    ............. Phil
     
  8. Phil Allison

    Phil Allison Guest

    "Uncle-Fester"


    ** Utterly incomprehensible & anencephalic with no bright ideas.






    .............. Phil
     
  9. Sounds suspiciously like you're describing yourself there Toaster Boi,
    except the last part which should read ".....with not even any dull ideas."
     
  10. Phil Allison

    Phil Allison Guest

    "Uncle-Fester"

    ** I supplied a proof for my recommendation - which BTW is based on long
    experience of dealing with high voltage elctros.

    You simply ignored it.

    Piss off.




    ............. Phil
     
  11. Phil Allison

    Phil Allison Guest

    "Uncle-Fester" = another anencephalic prick



    ** **** off - you rote learning moron.




    ........... Phil
     
  12. keithr

    keithr Guest


    Good god, someone has cloned Rod Speed!
     
  13. Mark Harriss

    Mark Harriss Guest

    yeah Buddy!, only with Horns!!!
     
  14. Phil Allison

    Phil Allison Guest

    "Uncle-Fester" = another anencephalic prick


    ** **** off - you rote learning moron.




    ........... Phil
     
  15. One day Uncle-Fester got dressed and committed to text
    OK, since you guys say you have the real 'gen' (not like Phil) and all the
    knowledge, how do ya calculate the values of the resistors ??
    Forget all the abuse and denigration, share your superior knowledge with me
    ??
     
  16. Mark Harriss

    Mark Harriss Guest

    For resistors across electros in series??: it's in that link I posted.
    for resistors in series it's R(total)= r1+r2+r3......+rn
    for resistors in parallel it's R(total) = 1/(1/r1 + 1/r2 + 1/r3 +..1/rn)

    Regards
    Mark
     
  17. Phil Allison

    Phil Allison Guest

    "Mark Harriss"

    ** Totally asinine shite - as expected from a 20 -ish Neo Nazi ****
    from Queensland.

    Harrarse is functionally illiterate.




    ............... Phil
     
  18. Mark Harriss

    Mark Harriss Guest

    Those formulae are wrong Phil??. How??, Oh sorry I forgot
    they most likely ARE different on planet Phil-Toaster-Bitch
    Allison!. How DID you arrive at the age of 20 something
    anyway? I've worked professionally in electronics for 24
    years now: according to your math (Honours) I'm 5 years or
    younger when I started in electronics: must have been born
    with an iron in my hand eh?.

    Hey...good news!!! I've been approached to do honours as
    well!!!....isn't that fantastic??. And I got laid yet again!!
    The only way we'd have anything in common would be if I
    shaved my cat's arsehole and taught it to walk backwards:
    Then it would look like you!!!.


    Regards
    Mark
     
  19. Phil Allison

    Phil Allison Guest

    "Mark Harriss"
    ** Totally asinine shite - as expected from a 20 -ish Neo Nazi ****
    from Queensland. Harrarse is functionally illiterate.




    " Well I should graduate in six months time.......
    AND I got laid last night.

    Regards Mark "


    ** Without learning a single, damn thing - must qualify for a
    stupidity award.



    ** Gay sex does not count - you pathetic, fascist, autistic moron.





    ............. Phil
     
  20. KLR

    KLR Guest

    A cat's arse hole doesnt have any hair on it.
     
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