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Old 16th January 2013, 12:47 PM   #291
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I am also planning to use figure 8 from Rod Elliot's article.
And I am going for Nippon electrolytics, KY series, rated at 4700uF/25V, 10.000 hours at 105 C, 4.220 mA ripple at 105 C. Or even the GPA series equivalent, having 3.730 mA ripple capability at 125 C.

Would the aforementioned caps suffice?
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Old 16th January 2013, 02:06 PM   #292
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Depends on what transformer you have audiostrat.

I will also go for the figure eight, but ends up with 2X10000uF 6,3V times two.
Will be used in my Goldmundclone.
Getting to be a quite nice build, two 625VA transformers should be good as gold.
And after having tested them today, I find that the DC-component on the powerline actually have something to do with the hum and noise. And the idle powercvonsumption.
Never concidered it a problem earlier. Strange.

But as I always state: One learns something every day, the whole life through.
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Old 16th January 2013, 02:29 PM   #293
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Well, after having looked around I find that Panmasonic have a nice cap for this. FM series
2700uF 16V. 12,5mm diameter, 30mm high. Lifespan 8000Hrs/105°C
Ripplecurrent 3630mA When putting four of theese in paralell, adding another bank of four caps in series as figure 8 indicates, and there it is. Whopping 14520mA ripple current.
And this for a price not exceeding $8,- Nice.
Rectifierbrigdes of 35A is in my workshop since long ago.
So there we are, ready built at a price close to a fraction of most DC-filters on the market I will have my toroids working under the very best conditions.
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Last edited by TANDBERGEREN; 16th January 2013 at 02:33 PM.
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Old 16th January 2013, 02:43 PM   #294
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Well, the transformer will be a 160VA-200VA toroid.
I know, a bit small! So these caps do for it, right?
In any case, shouldn't the ripple rating be the maximun steady current the primary could draw? In my case, roughly 0.7-0.9A - say 1A.
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Old 16th January 2013, 03:26 PM   #295
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Quote:
And after having tested them today, I find that the DC-component on the powerline actually have something to do with the hum and noise. And the idle powercvonsumption.
Without a doubt! Not only does it stop the hum, but it improves what's happening on the secondary.

Quote:
Well, the transformer will be a 160VA-200VA toroid.
You have a hum problem with that small a VA rating? It's said that DC begins to cause hum in 600 and above VA rated transformers.
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Old 16th January 2013, 04:27 PM   #296
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Quote:
Originally Posted by audiostrat View Post
Well, the transformer will be a 160VA-200VA toroid.
I know, a bit small! So these caps do for it, right?
In any case, shouldn't the ripple rating be the maximun steady current the primary could draw? In my case, roughly 0.7-0.9A - say 1A.
As already said, You shouldn't have any hum-problems caused by DC on your powerline. Excactly where the limit is I am not sure, but around 500VA I brelieve.
If You build according to Elliots figure 8 the diodebrigde will be the one actually carrying the power. Already at about 1% on the climb on the sinecurve the diodes are "on the case" and they stay there until the voltage is below their triggervoltageX2.
So Your choise of components are adequate in any case.
But check what DC-resistanse your primary windings have.
Will easily determine wether You will have benefit of this filter or not.
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Old 16th January 2013, 05:14 PM   #297
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vdi_nenna: I don't have any problems yet since I have not constructed the build. I was thinking to put it on, mainly for trial, to take measurements. And of course, to reduce off-load consumption - on Rod Elliot's site, it is clear that you don't need the dc component not only for audible reasons, but also for unnecessary magnetising currents. Even if small, bigger than normal.

TANDBERGEREN: This is what I am planning to do!

Last edited by audiostrat; 16th January 2013 at 05:16 PM.
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Old 16th January 2013, 05:27 PM   #298
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Quote:
Originally Posted by tiefbassuebertr View Post
About the PDF
http://www.epcos.de/web/generator/We...nformation.pdf
I read follow on page 28:
6.2 Series connection of aluminum electrolytic capacitors
When designing series circuits with aluminum electrolytic capacitors, care must be taken to en-
sure that the load on each individual capacitor does not exceed its maximum permissible voltage......
Notice that this is about applying DC voltage. This application is AC voltage.
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Old 25th February 2013, 06:15 PM   #299
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Has anyone tried one of these for removing DC?
L C Audio Technology / Front Page

I would prefer to buy a premade unit I think, save flaffing around
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Old 26th February 2013, 10:54 AM   #300
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Peranders is a better design.

I don't like the polarised single capacitor passing mains AC in the LC version.
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