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Old 24th March 2010, 07:37 PM   #221
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Quote:
Originally Posted by steve jones View Post
Was wondering how warm/hot the Sabre chip runs on the Buffalo II PCB?

Was intending to mount it bottom side flush (with reliefs cut for misc capacitors and inductors) on a piece of spruce like my Attraction DAC.

Russ, any opinion if this would overheat the chip or not?
It runs very cool.

On the Buf32S it ran pretty warm because of the hot opamps adjacent to it.
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Old 24th March 2010, 07:45 PM   #222
NicMac is offline NicMac  Italy
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Quote:
Originally Posted by Russ White View Post
The output voltage of our AVCC modules is ~3.5V on both sides It will vary a little from part to part.
Russ, is this because 3V5 sounds better than 3V3 or is it because the shunt reg works better at this output voltage?
Thanks,
Nic
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Old 24th March 2010, 07:48 PM   #223
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It's because it sounds better. The higher swing gives it better DNR.
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Last edited by Russ White; 24th March 2010 at 08:17 PM.
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Old 24th March 2010, 07:53 PM   #224
toufu is offline toufu  United States
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Got my Buffalo II board, thanks!

One question, I am planning on using the Lampizator as the output. What should the loading resistor be? On Lampizator's page, he mentions that 39ohm? Is that correct?
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Old 24th March 2010, 08:01 PM   #225
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Originally Posted by acidbrain View Post
Received mine without TAXES !
Havent recieved mine yet....but the no taxes idea sounds good to me....

Hope I'll recieve it just before the weekend....that would be just....:-)

Emile (shipping was on March 19, 2010)
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Old 24th March 2010, 08:18 PM   #226
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Originally Posted by toufu View Post
Got my Buffalo II board, thanks!

One question, I am planning on using the Lampizator as the output. What should the loading resistor be? On Lampizator's page, he mentions that 39ohm? Is that correct?
You would have to ask the lampizator.
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Old 24th March 2010, 08:32 PM   #227
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Quote:
Originally Posted by steve jones View Post
I've got a custom 48% nickel core pair ordered from Bud Purvine at Onetics. The primary will simply be connected between + and - outputs (for each DAC channel) and primary's center tap left floating.

1:1 ratio for a single ended output voltage of around 3.03V peak to peak dependant upon AVCC voltage. Or ground the secondary's center tap for a balanced output.

Simple. Hopefully not too much so.
Thanks for your info. Is that 3.03V balanced out?

I've read that it's best to use the sabre chip as voltage out when pairing with transformers. What kind of specs would this require for the transformer? Higher DCR of the windings or a resistor strapped across the primaries?
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Old 24th March 2010, 09:44 PM   #228
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I have a pair of these in my stash and was thinking of using them. Would they work?
Sowter Transformer 9762 DAC INTERFACE* FOR AD1865N-J

JD
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Old 24th March 2010, 10:48 PM   #229
Magsy is offline Magsy  United Kingdom
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Mine arrive today, thanks, looks excellent and packaging is good!

Bloody OPA1632 appears to be in short demand and my already delayed back order by RS is nowing showing late July for delivery! Hah, serves me right.
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Old 24th March 2010, 10:54 PM   #230
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Received today mine Buffalo II, IVY III, Placid & Placid Bipolar & Transformer 2 x 115V 30VA, to use it for 230V I have to connect togheter grey & violet so the fase is brown, right?
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