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Old 13th February 2013, 07:41 AM   #91
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Default PSU caps Questions

Hi Meanman1964,

What is the maximum size of the PSU CAPs (30, 35 mm) ?
10 mm Snap In are OK ?

Do you plan to include these Caps in the component kit ?

As an option ?

Considering the output current (400/450 mA), do You think 105C grade is necessary ?

(In my opinion 4700 F is a too small value)

Regards.

Eric.

Last edited by maillard; 13th February 2013 at 07:56 AM.
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Old 13th February 2013, 09:34 AM   #92
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Snap In is 10mm and 30 mm size 105 and yes they are included in the kit.4 X 4700F is more than enough.Read Hugh Dean is comment about that he has given a reason why not use more F.
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Old 13th February 2013, 11:22 AM   #93
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I have a stock of Nichicon KGs Gold Tune 4700/50V, which are Hugh`s first cap of choice...
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Old 14th February 2013, 06:03 AM   #94
sureshm is offline sureshm  Australia
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meanman, do you have the link to Hugh's comments? I am curious as well. Thanks
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Old 14th February 2013, 06:33 AM   #95
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Hugh's comments on cap supply in the psu are as follow:

Swordfishy/ASPEN FETZILLA power amp

Post 104:


Dinesh,

I really would discourage you from building a huge power supply. It will not sound so good.

I have done extensive testing with Class AB amps on this issue and found again and again that the very high charge pulses found in high cap power supplies actually militate against good sonic performance. The problem is that these very high charge pulses interfere with the voice coil earth return through the filter caps, causing intermodulation.

I find it's never necessary to go much more than 4,700uF on a 50W amplifier.

The FETzilla uses two 3,300uF caps separated by interelectrode resistors, each of 0.15 ohms. This quarantines the charge pulses principally to the first cap after the rectifier, with the second cap handling much reduced charge pulse and all of the speaker return current. This arrangement gives palpably better sound.

Cheers,

Hugh
__________________
Aspen Amplifiers P/L (Australia)
Aspen Amplifiers


Hugh mention this quite a a lot, he has reasons that high cap psu attracts high refresh currents that over mask the sonics of the audio signal. It's a very interesting comment!

Regards

ML
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Old 14th February 2013, 06:54 AM   #96
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That's the link thanks ML
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Old 14th February 2013, 08:43 PM   #97
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Hi Meanman,
Message sent to you mail box.
EM
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Old 14th February 2013, 11:39 PM   #98
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Quote:
Originally Posted by maillard View Post
Hi Meanman,
Message sent to you mail box.
EM
Did answer you but still no reply from you
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Old 15th February 2013, 12:31 PM   #99
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In mean time the small fets has arrived at my home today
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Old 23rd February 2013, 05:42 PM   #100
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Did send Farnell a mail regarding the needed component but still no respons please have patience
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