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  #11  
Old 03-06-2007
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Well, it's a matter of when for any capacitor... my ancient 235W CWT is still plugging along with its all Fuhjyyu cap compliment going on 9 years now. It's all about the cooling
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  #12  
Old 03-06-2007
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Originally Posted by jonnyGURU View Post
CAD: In case it wasn't already made clear, the V/Div on those Oscope screenshots is .01V and not the .05 I usually use in the PSU reviews.
Ahhh so
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Old 03-06-2007
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CAD - make note of this PSU. I wanna know how long the CWT->Fuhjjyu based units last after recapping and if there can be "unforseen incompatibility" issues, as in making it worse for the end user overall. Maybe some EC's do better, as in reactions per second than others? I dunno, not enough time to get into the nitty gritty.
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  #14  
Old 03-06-2007
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Kab, my two cents.

The increase and or change in ripple is negligble. It means little if anything.

The Fuhjyyu caps are probably rated for 2k hours at 85C but in real life suffer badly at temps over 45C. Nearly everyday I post in a thread where the issue is the Antec SP or TP PSU over at AnandTech.

Rubycon (very good Nipponese cap) states that for every 10C drop in operating temp cap life doubles. So a Ruby rated at 2k hours at 85C will last 32k hours at 45C.

The Nipponese caps OKW installed are rated at 105C, so you might have a very long wait. I am not a cap expert but the needed reaction might be better suited to the 85C cap vs the one rated for 105C.
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  #15  
Old 03-06-2007
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The increase and or change in ripple is negligble. It means little if anything.
Exactly. The small increase is likely just from ambient RF interference.
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Old 10-29-2007
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Mr Guru,

I think the author of the article was on the right track, but his testing may have been a tad premature.

Capacitors should be given time to settle down. His should burn them in for at least 100 hours and then test his updated units again for noise.

Your power supply reviews are very helpful.

Thanks
Aris
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  #17  
Old 10-29-2007
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Capacitors should be given time to settle down. His should burn them in for at least 100 hours and then test his updated units again for noise.
Unfortunately, that wasn't possible due to logistics factors.

Thanks for the comments
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  #18  
Old 10-29-2007
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Default Did you remember to pick low ESR caps?

Capacitors to filter switching power supply noise often need low ESR,
and definitely need high ripple current ratings. (Which amounts to the same thing, because high ESR when the ripple current is high gives I-squared-R losses which overheat the cap.)

Neither the KZE or KY series are particularly low impedance. See http://www.chemi-con.com/u7002/applications_ms.php for advice on what you should have used.

I've replaced bad caps on motherboards with great success, although never in a PSU.
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Old 10-29-2007
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Neither the KZE or KY series are particularly low impedance. See http://www.chemi-con.com/u7002/applications_ms.php for advice on what you should have used.
I used what I could get. I wanted to go with Panasonic FM, but that didn't work out.
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  #20  
Old 10-30-2007
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Something you have to realize about power supply capping and motherboard capping is not all things are equal. Caps that fail on motherboards fail for different reasons than caps that fail in power supplies and the caps used in power supplies are completely different values, sizes, etc. than caps used on motherboards.

When I bought the caps for Wolf's recaps, Matsushitas simply weren't available in the sizes needed for the secondary. And you'll note that some of the caps had to be replaced with different value caps when caps of the particular size required to fit into a tight space were not available. I can't find the thread over at Bad Caps right now, but the SamXon rep once pointed out that some caps in certain sizes may only be manufactured by one particular company and none other.

That said, I will say that it is an EXCELLENT point about not all caps enjoying the same impedance. Unfortunately, the Chemi-Con KZE and KY were what we could find even after hunting through several electronics shops in Taipei and a few PSU factories in Shezhen. It actually took about a week to round up all of the caps (not including shipping time, etc.)
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