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multiblitz  
#41 Posted : Friday, January 6, 2017 1:40:31 PM(UTC)
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I am using as well the BIII with Broskie's Unbalancer at the moment...two BIII in dual mono with an input resistor of 20 Ohm as passive I/V. Sounds absolutely great.

When reading the 9038 can do four times the current, I really love it: This would mean I could take only one DAC-Board instead of two and still have double the current, which means I can lower the I/V-resistor to 10 ohms, which I guess should be low enough to have the DAC running in current mode, right ?Or even more brutal: I/V-resistor of 5 ohms and TWO 9038 in Dual mono...
AndriyOL  
#42 Posted : Monday, January 9, 2017 4:06:21 PM(UTC)
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Originally Posted by: multiblitz Go to Quoted Post
I am using as well the BIII with Broskie's Unbalancer at the moment...two BIII in dual mono with an input resistor of 20 Ohm as passive I/V. Sounds absolutely great


Could you please show a schematic how you do this? What can you say about this I/V solution and discreet I/V stage, is there any difference?
Happy New Year!
TioFrancotirador  
#43 Posted : Thursday, January 12, 2017 9:35:35 PM(UTC)
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Has anyone tried powering Buffalo with LPS-1 from uptone instead of Placid HD or Salas Ref D?

Edited by user Thursday, January 12, 2017 9:36:14 PM(UTC)  | Reason: Not specified

multiblitz  
#44 Posted : Monday, January 16, 2017 11:11:39 AM(UTC)
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You can find the specs here

http://www.tubecad.com/2011/03/blog0203.htm

I did not try yet the SS-Output modules, a couple of legatos are here and I need to try them one day. The biii-unbalancer combo did outperform any DAC I have build and these were many....

I am using the BIII in dual mono, so I have 32mA ...doing the I/V with 20ohm input resistor gives me 640mVpk into the 12BH7 I am using as Input tube currently with about a gain of 20 gives an output of 12Vpk...my tube amp needs a bit more of drive (2 stage design, one 6n6p driving directly the El34 in pp/Ul). Yours may be more sensitive and you could even go lower on the i/v resistor.

I did not try the 12ax7 as input tube or the 6n2p yet...the second is to be rumored to be extremely nice.

But if they deliver a gain of 100 instead the 20 of the 12Bh7, you could build a tube-Based Outputstage with passive i/v as low as 2 ohm with the new 9038 or 1 ohm in dual Mono....I guess this will be low enough to make the DAC work in current output mode...

Edited by moderator Saturday, March 11, 2017 1:36:57 AM(UTC)  | Reason: Not specified

thomaspf  
#45 Posted : Thursday, February 2, 2017 9:44:29 PM(UTC)
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Oppo finally released their 9038pro based Sonica DAC for pre-order so the availability of the final chips must be getting closer?

Russ/Brian, any updates on that new I/V stage?

Cheers

Thomas
AndriyOL  
#46 Posted : Sunday, February 26, 2017 7:22:48 AM(UTC)
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Russ, will your I/V stage feature differential/balanced outputs?
Brian Donegan  
#47 Posted : Monday, March 6, 2017 8:58:53 PM(UTC)
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Yes.
akras2  
#48 Posted : Tuesday, March 7, 2017 5:44:14 AM(UTC)
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Is the new Buffalo going to have the input headers directly matching the output headers of Cronus (like Buffalo III did)?

If so, will Cronus fit on top of the new Buffalo or below it (with the output stage attached to the Buffalo as intended)?

I would like to play with my Cronus and some other boards in a "not-used-as-intended" configuration before the new Buffalo is released, but I don't want to attach headers on the wrong side of Cronus so that it interferes with the output stage...

Thank you,

Andrey

Edited by user Tuesday, March 7, 2017 11:34:12 PM(UTC)  | Reason: Typo

markk02474  
#49 Posted : Thursday, March 9, 2017 8:15:22 AM(UTC)
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Originally Posted by: Russ White Go to Quoted Post
ES9038 is essentially 4 ES9018/28 output stages in parallel. So each of the 8 channels is equivalent to 4 channels in parallel (one stereo mode channel) of the ES9018/9028.

I am working on a very special output stage that will work for both new DACs. :)


Originally Posted by: Russ White Go to Quoted Post
That is correct. The 9028 is essentially a 9018 with an improved core and digital stage. The analog stage is basically the same. There is big downside to the ESS chips (old and new) that makes dual mono less than desirable. I will talk more about that later.

ES9038 absolutely needs a special output stage - it's output current and current consumption is huge - it needs very special care to be sure. This is because the analog output is directly referenced to the AVCC input - there is no PSRR. So with the huge currents involved you need very special care indeed.

Cheers!
Russ


I stumbled upon a Japanese DIY project for a ES9038pro DAC that tackles the I/V challenges by putting I/V converters in parallel from the parallel channel outputs of the 9038 to reduce heating distortion on resistors carrying large current.
http://blogs.yahoo.co.jp/yokoyama3322/19035128.html

Its much how parallelism is used for voltage amplification here to lower noise when measuring ultra low noise (0.8 uV) voltage regulators: http://cds.linear.com/do...ication-note/an159fa.pdf

Edited by user Monday, March 13, 2017 4:41:53 PM(UTC)  | Reason: Added detail on v reg noise measurement

akltam  
#50 Posted : Friday, March 10, 2017 3:22:57 AM(UTC)
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When will the Buffalo IV with ES9038 be available ?

Will it possible to use ES9038 with voltage out ? Will it reduce the SnN ration like the ES9018 ?

Alan
Russ White  
#51 Posted : Wednesday, March 29, 2017 6:10:16 PM(UTC)
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Sorry for not replying earlier - I have been busy with designing new modules - and work . :)

I will start a thread soon explaining our ES9028/38 design goals and features.

Cheers!
Russ
AlexQS  
#52 Posted : Tuesday, April 11, 2017 3:34:08 AM(UTC)
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Subscribed
akras  
#53 Posted : Tuesday, May 9, 2017 5:56:11 PM(UTC)
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Just a suggestion. I hope the new Buffalo(s) will have the input headers directly matching the output headers of Cronus (like Buffalo III did).

If not, please consider offering a simple adapter board, so the DAC(s) can be stacked with Cronus.

Thanks,

AK
Philipp  
#54 Posted : Tuesday, June 6, 2017 1:23:46 PM(UTC)
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Hello Brian and Russ
Any news about the new Buffalo?
Kind Regards
Phil
TioFrancotirador  
#55 Posted : Saturday, June 17, 2017 12:42:45 PM(UTC)
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Russ, any news? :)
Brian Donegan  
#56 Posted : Thursday, June 22, 2017 8:14:39 PM(UTC)
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We will be making a series of announcements shortly.
Lucaslucas  
#57 Posted : Sunday, June 25, 2017 1:48:29 PM(UTC)
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Great to hear something will be coming soon.

Has or will there be consideration of multichannel use with this new chip, particularly in terms of supporting boards such as an 8 channel IV?
To support those with digital xover or for home cinema use?

Thanks

Brian Donegan  
#58 Posted : Sunday, June 25, 2017 2:22:49 PM(UTC)
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Yes.
yoke  
#59 Posted : Wednesday, July 5, 2017 12:49:25 PM(UTC)
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Originally Posted by: Brian Donegan Go to Quoted Post
Yes.


Angel
I'm interested for DSP project
will follow Angel

Edited by user Wednesday, July 5, 2017 12:50:00 PM(UTC)  | Reason: Not specified

DAP_CH  
#60 Posted : Thursday, July 6, 2017 7:03:34 AM(UTC)
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I subscribed and I look forward of your news to realize my DAC-8 channels.
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