0ne 100uF cap or ten 10uF caps (or two 200uF caps...etc)
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 15th September 2010, 09:14 AM #1 Hubba   diyAudio Member   Join Date: Feb 2007 Location: Östergötland 0ne 100uF cap or ten 10uF caps (or two 200uF caps...etc) Hi, In a PSU (for a tube amp, with a choke, cap, choke, cap config) What would be the result if I substitute say a 100uF cap with ten 10uF caps in parallell, or two 200uF caps in series. Simple math tells you that the total uF will be the same but I do not have the skills to know what will actually happend. Are there any pros/cons of building a PSU with a single cap of the correct uF instead of a couple of caps giving the same total uF for the cap in question. Regards, Fredrik
mnemneth
diyAudio Member

Join Date: Feb 2006
Location: Dundee
Quote:
 Originally Posted by Hubba Hi, In a PSU (for a tube amp, with a choke, cap, choke, cap config) What would be the result if I substitute say a 100uF cap with ten 10uF caps in parallell, or two 200uF caps in series. Simple math tells you that the total uF will be the same but I do not have the skills to know what will actually happend. Are there any pros/cons of building a PSU with a single cap of the correct uF instead of a couple of caps giving the same total uF for the cap in question. Regards, Fredrik
Hi there.
Rod Elliot of ESP recommends using multiple paralleled capacitors rather than 1 large value item.

His comments can be seen here;

Project 101 - High Power, High Fidelity MOSFET power amplifier

Go down the page to Fig. 3 and read the comments below it.

Basically, you can expect better performance and lower cost but offset against this will be greater complexity of build.

I can't see any benefit from using higher voltage rated items in series but if you have lots to hand, why not?

Sandy

 15th September 2010, 06:07 PM #3 Gopher   diyAudio Member   Join Date: Nov 2005 Location: UK It's not as simple as just paralleling them. The caps can only be placed a minimum of their diameter and a bit apart unless you mount them on both sides of a pcb. You have to connect the parallel caps with something, either pcb traces or wires. Sooner or later the pcb trace/wire inductance and resistance outweighs the gains in reduced inductance and ESR won by paralleling the caps in the first place. If, for example, I wanted a 10,000uF cap, I'd limit it to 4 or 6 x 2,200 uF mounted on both sides of a pcb. Always use higher voltage rated caps - they have lower ESR to start with.
 15th September 2010, 06:13 PM #4 Gopher   diyAudio Member   Join Date: Nov 2005 Location: UK It's not as simple as just paralleling them. The caps can only be placed a minimum of their diameter and a bit apart unless you mount them on both sides of a pcb. You have to connect the parallel caps with something, either pcb traces or wires. Sooner or later the pcb trace/wire inductance and resistance outweighs the gains in reduced inductance and ESR won by paralleling the caps in the firstplace. If, for example, I wanted a 10,000uF cap, I'd limit it to 4 or 6 x 2,200 uF mounted on both sides of a pcb. Always use higher voltage rated caps - they have lower ESR ro start with.

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