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Buffalo 3 Kit ordered, help with BOM
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deafbykhorns  
#1 Posted : Saturday, December 3, 2011 8:36:57 PM(UTC)
deafbykhorns

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Russ, Brian

Was lucky enough to get the pre-order in for the Dec 18 batch of Buffalo 3 kits.
Due to my workforce shortage these next couple weeks I have been working long hours and haven't had time to read all the manuals. I hope by the time this ships, I will have some time to read.
I was hoping you could give me a recommended BOM to complete the kit so I don't have to read thru the thousands of posts.
I Pre-Ordered the following digital section so far.
Buffalo-III DAC
(1) Buffalo-III Base Module (Assembled and Tested)
(1) AVCC Dual Shunt Regulator Module (Assembled and Tested)
(2) Trident 3.3V Shunt Regulator Module (Assembled and Tested)
(1) Trident 1.2V Shunt Regulator Module (Assembled and Tested)

To finish the digital, and correct me if I'm wrong, I need the LCDPS Dual Power Supply and a 9+9v Tx for the digital section.

I'm a tube guy so I was thinking the Discrete Legato 3.1 would fit the bill since it allows some opamp rolling.
I know some guys would say tube stage but I already have 2 stages in my DIY amp design with plenty of gain for a 1v input. I think the low impedance DAC would be happier with your IVY or Legato as an I/V between DAC and tube amp.
Power this with a shunt regulated Placid HD bipolar supply with a 15+15v Tx?
What would the output buffer option do for me?
Would the SE (Ballsie) stage be better off with another power supply or would I be OK with sharing? I know at some point this could fall under diminishing returns rule. If you recommend another supply, could I share the 15+15 analog transformer?

Extras:

From what I read in a forum, I would add the S/PDIF Transceiver with the Wolfson chip since this may reduce jitter from my Sono's music server. The direct Buffalo S/PDIF doesn't function to reduce jitter? Would this need another LCDPS supply with 9+9 Tx?

Metronome in case I find a I2S off my vintage 1988 CD player with TD1541A DAC, I think the sample rate would be different than what the Buffalo is looking for? Separate LCDPS supply for this as well? Separate transformer?

Ribbon cables, caps or resistors needed with any of the above mentioned kits?

If this is the wrong forum, please move and do not delete, I have limited time for the next two weeks.
Thanks again

Edited by user Saturday, December 3, 2011 9:15:28 PM(UTC)  | Reason: Not specified
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LeonvB  
#2 Posted : Sunday, December 4, 2011 12:21:07 AM(UTC)
LeonvB

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You don't have to go through posts, just read the guide. It includes a BOM for stereo, dual mono and multi channel setups.

To answer your questions:
LCDPS or Placid HD for digital, both require a 9V transformer.
The IVY3 or Legato I/V stage require a bipolar PSU, so the Placid HD BP would indeed be a good choice, with a 15V+15V transformer.
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deafbykhorns  
#3 Posted : Sunday, December 4, 2011 7:57:23 AM(UTC)
deafbykhorns

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LeonvB wrote:
You don't have to go through posts, just read the guide. It includes a BOM for stereo, dual mono and multi channel setups.

To answer your questions:
LCDPS or Placid HD for digital, both require a 9V transformer.
The IVY3 or Legato I/V stage require a bipolar PSU, so the Placid HD BP would indeed be a good choice, with a 15V+15V transformer.


Thanks, I did scan thru the guide
But it doesn't answer some of my questions in regards to the "extras" (metronome,S/PDIF Transceiver, ribbon cables) and the option of separate PS on the Ballsie stage.

So the digital sections just need a single supply? And the audio sections need the bipolar supply?
The manual says Placid "tuned" for shunting or one half of a LCDPS. So do I need more parts or is this accomplished with the pot?

Now what about the metronome,S/PDIF Transceiver? Can I power both of these with a dual LCDPS and one 9v PS?

Edited by user Sunday, December 4, 2011 7:58:09 AM(UTC)  | Reason: Not specified
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LeonvB  
#4 Posted : Sunday, December 4, 2011 9:35:50 AM(UTC)
LeonvB

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You can always add more PSU sections. You can even use multiple PSUs for a single I/V stage. The benefit would be rather small however, you can gain more by going dual mono if you really want to spend more on your project.
Other extra's:
- Metronome is only required if the signal isn't compatible with the 9018.
- Transceiver: not needed, the 9018 is quite capable of de-jittering the signal.
- Digital section: you only need 1 5V supply for a BIII board, and you could even power things like an old Mux or Toslink module.
- Both sections are for audio, you mean the analog sections: yes both IVY3 and Legato need a bipolar PSU.
- Placid is a shunt PSU. You should tune it so there's enough headroom so it doesn't sag.
- LCDPS is a dual PSU. You could use 1 half for a BIII and the other half for things like the Toslink module, Metronome, etc.
- Ribbon cables: the guide does mention "Suitable connectors are shipped with the board and modules."
- Do I need more parts is a question I can't answer. In general the TPA kits are complete kits, except for things like an enclosure, IEC, etc. But you could run into trouble like wreck a few parts, etc. That's what the extended BOM is for: give you parts suggestions, and replacement options.
- with the pot? I do not understand this remark.
- Already answered above
- Yes
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