many smaller caps Vs big ones - Page 2

Jocko Homo · 1st March 2002, 07:28 PM

Hairy Holler:

You may be right for HFQs and the like. They probably have lower ESL. There is a place for skinny ones here, and they do come in handy as decoupling. Especially for digital stuff.

Unless you can afford those expensive carbon types.

I was refering to filter caps. 10,000 uF and up types.

Yep, that amp I built with skinny caps had no bottom at all. Not my plate of shrimp..........

Lisandro_P · 2nd March 2002, 02:26 AM

A few things no one mentioned, i think.... using multiple caps have other advantages besides ESR and the works.

- 1. More voltages rating available on smaller caps than bigger ones. This came in handy for me, as my PSU delivers 22vdc, so i was able to order 35v caps instead of the "regular" 50v ones and save quite a few bucks. The bigger "can" caps came only in 50v and 100v ratings.

-2. Smaller caps are cheaper than a bigger cap at the same capacitance. I didn't expect this, but it is so

My cap-x power supplies has 54,400 uF in total, and that costed me $40; about 1300uF per buck (not counting bypass caps included in that too). Not bad!

promitheus · 2nd March 2002, 03:20 PM

Normally alot of small caps cost less at the same capacitance. But you have to remember that you need a lot more work and maybe a heavy duty pcb to carry all the caps. I like a lot more small caps than 1-2 big ones. But you DO have to know the specs of them because it is very important when designing.

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1st March 2002, 07:28 PM	#11
Jocko Homo Banned Join Date: Feb 2002 Location: As far from the NOSsers as possible	Hairy Holler: You may be right for HFQs and the like. They probably have lower ESL. There is a place for skinny ones here, and they do come in handy as decoupling. Especially for digital stuff. Unless you can afford those expensive carbon types. I was refering to filter caps. 10,000 uF and up types. Yep, that amp I built with skinny caps had no bottom at all. Not my plate of shrimp..........

2nd March 2002, 02:26 AM	#12
Lisandro_P diyAudio Member Join Date: Oct 2000 Location: Argentina	A few things no one mentioned, i think.... using multiple caps have other advantages besides ESR and the works. - 1. More voltages rating available on smaller caps than bigger ones. This came in handy for me, as my PSU delivers 22vdc, so i was able to order 35v caps instead of the "regular" 50v ones and save quite a few bucks. The bigger "can" caps came only in 50v and 100v ratings. -2. Smaller caps are cheaper than a bigger cap at the same capacitance. I didn't expect this, but it is so My cap-x power supplies has 54,400 uF in total, and that costed me $40; about 1300uF per buck (not counting bypass caps included in that too). Not bad!

2nd March 2002, 03:20 PM	#13
promitheus diyAudio Member Join Date: Jan 2001 Location: Germany	Normally alot of small caps cost less at the same capacitance. But you have to remember that you need a lot more work and maybe a heavy duty pcb to carry all the caps. I like a lot more small caps than 1-2 big ones. But you DO have to know the specs of them because it is very important when designing.

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