Electrolytic caps in series

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

1. Rheilly PhoullGuest

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

2. Phil AllisonGuest

"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. Rheilly PhoullGuest

One day Phil Allison got dressed and committed to text
Thanks Phil

4. Mark HarrissGuest

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 AllisonGuest

"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 HarrissGuest

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 AllisonGuest

"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 AllisonGuest

"Uncle-Fester"

** Utterly incomprehensible & anencephalic with no bright ideas.

.............. Phil

9. Alan RutlidgeGuest

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 AllisonGuest

"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 AllisonGuest

"Uncle-Fester" = another anencephalic prick

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

........... Phil

12. keithrGuest

Good god, someone has cloned Rod Speed!

13. Mark HarrissGuest

yeah Buddy!, only with Horns!!!

14. Phil AllisonGuest

"Uncle-Fester" = another anencephalic prick

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

........... Phil

15. Rheilly PhoullGuest

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 HarrissGuest

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 AllisonGuest

"Mark Harriss"

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

Harrarse is functionally illiterate.

............... Phil

18. Mark HarrissGuest

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 AllisonGuest

"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. KLRGuest

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