Question about Capacitors

[K2LRV]

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.

 

[Rich Webb]

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.

It depends. Here's a brief starting point
http://www.stanford.edu/class/ee133/handouts/general/capHO.pdf

 

[Andre Majorel]

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.

http://www.musicsynthesizer.com/txt/caps2.txt
http://www.interq.or.jp/japan/se-inoue/e_capa.htm
http://my.execpc.com/~endlr/

I think there's also a section on the subject in Bob Pease's
_Troubleshooting analog circuits_.

 

[DJ Delorie]

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.

 

[Eeyore]

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.

Oh God !

Buy a book !

Graham

 

[Eeyore]

http://www.musicsynthesizer.com/txt/caps2.txt
http://www.interq.or.jp/japan/se-inoue/e_capa.htm
http://my.execpc.com/~endlr/

I think there's also a section on the subject in Bob Pease's
_Troubleshooting analog circuits_.

If you need to troubleshoot a decent capacitor you probably aren't living in
the real world.

Correction. There's no 'probably' about it.

Graham

 

[Eeyore]

Don't use ceramic with high ripple currents

Ceramics are NEVER used with high ripple currents you brain dead
defective.

Go away and die.

Graham

 

[DJ Delorie]

you brain dead defective.

Go away and die.

Wow, someone's off his meds again.

 

[Jamie]

DJ Delorie wrote:




Ceramics are NEVER used with high ripple currents you brain dead
defective.

Go away and die.

Graham

Oh really..

Tell that to the military customers that required us to
test the ripple currents on ceramic caps back when I was at
Semco.
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.

http://webpages.charter.net/jamie_5"

 

[Eeyore]

Wow, someone's off his meds again.

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

Graham

 

[Eeyore]

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

Mica caps with very high ripple currents ?

Bwahahahahahahahahahhahah

 

[DJ Delorie]

Provide an example of a ceramic caps with high ripple current

That would go against my original recommendation.

 

[DJ Delorie]

That would go against my original recommendation.

That is, providing an example of ceramics used in a
high-ripple-current situation would go against my original
recommendation.

 

[Andre Majorel]

Ceramics are NEVER used with high ripple currents you brain dead
defective.

Go away and die.

Is that the real Graham Stevenson or a forgery ? The Path: looks
genuine to me.

 

[Jamie]

Jamie wrote:




Mica caps with very high ripple currents ?

Bwahahahahahahahahahhahah

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

Stop embarrassing your self and move to a different subject.

By Eye-Sore.


http://webpages.charter.net/jamie_5"

 

[Eeyore]

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

Stop embarrassing your self and move to a different subject.

Please post ripple current ratings for mica caps.

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

MORON

Graham

 

[Eeyore]

Is that the real Graham Stevenson or a forgery ? The Path: looks
genuine to me.

It's genuine.

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

Graham

 

[Jamie]

Are there no other situations where ripple current matters? Perhaps unusual
power HF systems?

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.


http://webpages.charter.net/jamie_5"

 

[Phil Allison]

"Lostgallifreyan"

Eeysore to Fake

Are there no other situations where ripple current matters? Perhaps
unusual
power HF systems?

** 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

 

[Eeyore]

Eeyore wrote

Are there no other situations where ripple current matters? Perhaps unusual
power HF systems?

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.

Graham