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Old 17th February 2003, 01:42 AM   #1
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Default Bridge rectifiers for Aleph

Hi, I see all Aleph's series , Nelson used only 1 bridge rectifier, but many diy project on "passdiy" they usually used 2 bridges, is any different ?
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Old 17th February 2003, 02:29 AM   #2
Jay is offline Jay  Indonesia
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Hi,

It surprised me if Mr. Pass used only one bridge (for 2 channels). One bridge for two channel means one transformer for two channels, or both channel share the same transformer.

Using dedicated power supply to each channel you will get better separation (you know what I mean).

May be you saw a monoblock, may be not. Mr. Pass is supposed to have built plenty of Alephs, so some of them may be with dedicated power supply, some with shared power supply.

Dedicated power supply may be not economical (if we talk about price to performance ratio). But Audiphiles always choose the non-economical way. As an audiophile and a businessman, I think Mr. Pass had managed to build both.
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Old 17th February 2003, 01:19 PM   #3
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I've seen a single bridge going from positive to negative rail.

There's also 2 bridges, one from positive rail to ground, the other from ground to the negative rail. Are the peak currents lower in each bridge? Is the resulting ripple better or anything? There has to be some reason to go through the extra trouble.

That can be separate from whether there's a separate supply per channel.
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Old 18th February 2003, 10:08 AM   #4
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Hi,

I made a bridge just like Peter. But i have doubts about the wiring. If anybody knows if ts's wrong or right, please let me know.

Nick
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File Type: jpg bridge_1s.jpg (19.7 KB, 749 views)
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Old 19th February 2003, 02:21 PM   #5
Jay is offline Jay  Indonesia
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As long as the circuit is right, I cannot see why there should be a problem with the wiring. I only have a little doubt on the capacitors.

I guest the transistors are double pined (diode) and the caps are in parallel with each diode, and the caps are at least 100n. I won't hear any different whether the caps are 100n, 10n, or null, but I will have a bad feeling using 100n. I'll prefer 10n.
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Old 19th February 2003, 02:32 PM   #6
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Hi Jay

Do you have any experience with thes bridges ? That 10n value, did you calculate it or is it a commonly used value ?

I also downloaded that snubber/rectifier formula, but didn't get a proper calculation yet.

The value used on this bridge was chosen after reading about 'm on the net.

Grtz,
Nick
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Old 19th February 2003, 02:33 PM   #7
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Sorry I can't answer your question, Electro-Nick, but could you point me to the link where this rectifier assembly is described by Peter? I am completely unsure of the capacitor application and wanted to learn a little more about it.

Thanks!

S.
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Old 19th February 2003, 02:42 PM   #8
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Hello Sandy,

I guess this is the link where i found it. The formula is posted somewhere else... please don't ask me where.

I think if you search on "snubber" and "caculation" you'll find it.
Suxes !

Grtz
Nick
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Old 19th February 2003, 03:13 PM   #9
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Thanks, that's what I was looking for!

S.
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Old 19th February 2003, 03:16 PM   #10
UrSv is offline UrSv  Sweden
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Quote:
Originally posted by Sandy H.
Sorry I can't answer your question, Electro-Nick, but could you point me to the link where this rectifier assembly is described by Peter? I am completely unsure of the capacitor application and wanted to learn a little more about it.

Thanks!

S.
The single caps is a simplification of the snubber which might help and it might not. The source used in this forum seem to be mostly:

http://131.109.59.51/images/pdf/Calc...m_Snubbers.pdf
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