Capacitance Limit?

[Christian]

Is there a limit on how much caps you should use with your x-former. I mean, does it beginn to sound bad if you use too many caps on a small x-former?

/Chris

[Kilowatt]

No, it will never start to sound bad, no matter how much you add on. You could out on Farads and Farads if you like. Of course as the caps are charging (as you power up your amp), they draw a very high current from your trannie, and will do so longer as the caps get bigger. Then there's the cost thing.

[jackinnj]

they are less forgiving

[Kilowatt]

And even a solid state rectifier could blow during start up if you get too carried away.

[halojoy]

Originally posted by Christian
Is there a limit on how much caps you should use with your x-former. I mean, does it beginn to sound bad if you use too many caps on a small x-former?
/Chris

First question: How big is your room?
That will set a limit to how many Caps you can Fit.

Second Question: Is there a part of the kitchen you could use?
That can add some 10 Farad.

I am just guessing, but is it a Pass Amp you are going to supply?
Then you might even better use your Garage, too ...
Put your Car on your lawn instead.

/halojoy - with his Caps on

[Elso Kwak]

Originally posted by Kilowatt
No, it will never start to sound bad, no matter how much you add on. You could out on Farads and Farads if you like. Of course as the caps are charging (as you power up your amp), they draw a very high current from your trannie, and will do so longer as the caps get bigger. Then there's the cost thing.

Hi Kilowatt,
According to Horowitz this a is totally <B>NOT</B> true. "When choosing filter capacitors, don't get carried away: An oversize capacitor not only wastes space but also increases transformer heating (by reducing the conduction angle, hence increasing the ratio Irms/Iavg). It also increases stress on the rectifiers"

Better use a PI-filter. This will reduce the ripple far more effectively. You can make the second cap larger at will.

See also
http://db.audioasylum.com/cgi/m.pl?f...ly&r=&session=

[Kilowatt]

I'd have trouble believing that, because through the rectifier, I don't see how the transformer could possibly care if there are huge charged caps beyond it. But then again, I'm far from all-knowing.

And besides that, audiophiles aren't normally known to care about such things as efficiency.

[Elso Kwak]

Originally posted by Kilowatt
I'd have trouble believing that, because through the rectifier, I don't see how the transformer could possibly care if there are huge charged caps beyond it. But then again, I'm far from all-knowing.

And besides that, audiophiles aren't normally known to care about such things as efficiency.

Hi Klowatt,
As for soundquality a PI-filter with 2x 10,000µF and a 2.2 mH choke sounded better than the simple powersupply with doubled capacity. (2x 10,000µF)
I tried this in my own poweramp (AmpzillaII)

[Kilowatt]

Hmm, cool.

I may have to try that on my Leach/modified p3A amp, when I get around to finishing the thing.

[Elso Kwak]

Originally posted by halojoy

First question: How big is your room?
That will set a limit to how many Caps you can Fit.

Second Question: Is there a part of the kitchen you could use?
That can add some 10 Farad.

I am just guessing, but is it a Pass Amp you are going to supply?
Then you might even better use your Garage, too ...
Put your Car on your lawn instead.

/halojoy - with his Caps on

Hi Halojoy,
I love the (mental) picture: the room kitchen and garage full of those large beercansize caps!
I think the transformer will not survive the first inrush current charging those 10kF capacity. maybe I forgot a zero!