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Old 18th November 2010, 04:38 PM   #1
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Default Extreme Buffalo II build

I am seriously considering purchasing a buffalo II dac, but if I do, I don't want to leave out anything.
First off I should say I am intending on using the I2S connection.

Basically I am looking at to two buffalo dac's and two legato boards.
What is the maximum number of placid regulators that can be used with these boards.
I read somewhere in one of the manuals that you can use between 1 and 3 regulators per dac board. Any further info about that would be appreciated.

I will probably be putting the raw supply in a separate case and the shunt regulators in the second case with the dac's and legato boards.

What would you guys purchase and how would you connect it all together to make the most extreme buffalo with stock parts.
At this point in time I am not interested in doing mods unless they have been recommended by Russ.
Later when I am familiar with the stock sound I will consider modding.

Any help or advice would be appreciated.
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Old 18th November 2010, 05:12 PM   #2
LeonvB is online now LeonvB  Netherlands
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You can only use one Placid for the DAC board. You can however add 3 Trident regulators to each board. For the Legato, you can add 3 BP Placids. But somehow I doubt it'll give you much improvement over just one.
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Old 18th November 2010, 08:07 PM   #3
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Thanks for the reply.
Has anyone tried multiple regulators on these boards?
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Old 18th November 2010, 09:17 PM   #4
LeonvB is online now LeonvB  Netherlands
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The Trident regulators can be ordered starting today. They've not yet been shipped. I just ordered 2 sets for my dual mono DAC, so I'll propably be one of the first doing dual mono with a full regulator set.

My current list is:
2x BII DAC board
2x Placid
2x IVY 3
2x Placid BP
1x Mux unit
1x Toslink
1x Volumite
2x Ballsie (one for left & right)
2x R Core transformer 9V 30VA (one for left & right)
2x R Core transformer 15V 30VA
On it's way is
2x Trident combo set for BII

One could add a third Placid & 9V R-Core to fully separate the I/O modules like the Mux & Toslink from either channel, but this really is already pretty over the top as it is. The performance is really very good though: it simply amazes listeners a DAC can make such a difference.
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Old 19th November 2010, 05:07 AM   #5
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Can you tell me more about the trident regulators?
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Old 19th November 2010, 06:37 AM   #6
johnYks is offline johnYks  Australia
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Trident


http://www.twistedpearaudio.com/foru...g=posts&t=1421

Last edited by johnYks; 19th November 2010 at 06:39 AM.
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Old 19th November 2010, 03:09 PM   #7
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Thank you

The only other thing I would ask about, is what are the benefits of using r-cored transformers over toroidal?
Do theses benefits make an audible differece?
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Old 19th November 2010, 03:22 PM   #8
jcx is offline jcx  United States
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split bobbin windings give more leakage so need more air space or shielding but reduce coupling of line noise vs toroids with layered windings

split bobbin xfmr can have 5-10x less pri-sec parasitic coupling capacitance

I would use EI core split bobbin "international" double insulated line xfmr
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Old 19th November 2010, 05:37 PM   #9
LeonvB is online now LeonvB  Netherlands
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Quote:
The only other thing I would ask about, is what are the benefits of using r-cored transformers over toroidal?
Compared to EI/Torroid:
- Lower profile and smaller size (IMO mainly when compared to EI, Torroid is often smaller due to the higher core utilisation).
- Lower stray EM field from the round cross-sectional area and the balanced windings on either side.
- Lower core losses from no cuts the in core and minimized distance between the core and the windings. (again mainly compared to the EI)
- Lower temperature rise and noise from the round cross-sectional area and tappered slitting.

For me, the cost of getting them along the rest of the kit from the US was higher than getting shielded R-Cores shipped from France. Of course a nice shielded & potted torroid is also a good idea, but compared to those the shielded R-Core is much cheaper.
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Old 20th November 2010, 02:13 PM   #10
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with the installation of the Trident combo for Buffalo II, the AVCC shunt regulation will have to be removed? ie. one of the Tridents will supersede the original AVCC shunt small board?
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