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Gustard U12 USB Interface 8 Core XMOS chip

Mar 26, 2015 at 10:48 PM Post #1,006 of 3,701
benny-x said:
   
Not Dave Mahler? Oh, well if the boss tells me I like it, then I guess I was wrong, I didn't feel that way, and I "do" like it.
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The Woz likes'em and so do I!  https://www.youtube.com/watch?v=tQvSG5rStew
 
 
Chill dude
wink_face.gif
 
 
Mar 27, 2015 at 11:46 PM Post #1,008 of 3,701
Have the Melodious Mx-U8 on the way - some more data and pictures:
 
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[color=rgb(33, 33, 33)][left] DSD: DSD64, DSD128, DSD256 (2.822, 3.072, 5.644, 6.144, 11.2896 and 12.288MHz) (DSD requires the use of transmission and the need for DAC supports IIS) XMOS asynchronous receiver's USB audio program, until now recognized as one of the most outstanding asynchronous USB audio solution. The majority of high-end manufacturers use, USB has become almost de facto standard for audio-end applications. XMOS's unusually strong core, internal 8 microkernel work in 500MHz, the processing capacity to handle the USB audio data can be described as overkill, which ensures smooth and USB communication smooth. There will be no other low-end USB program sonic boom occurs. jitter can be as low 4.6ps Product Features: Using XMOS-U8 core, the latest plan, up to 32B 384khz Asynchronous Transfer Built imported TALEMA sealed transformer, using LT1963 and 8 ADP150 linear regulator chip, multi-level multi-group independent power supply, better than the market several hundred dollars XMOS linear power, the whole network only one with such a high-end power of XMOS decoding Do the upgrade on the clock circuit optimization, 44.1 / 88.2 / 176.4 / 352.8Khz and 48/96/192 / 384Khz were using two crystal Output interface is complete, with all current mainstream interfaces to improve playability Product materials introduction: Aluminum chassis, blasting process, with black and silver optional[/left][/color]
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[color=rgb(33, 33, 33)][left] PCB is costly to do, immersion gold process TALEMA sealed transformer, imported, non-comparable domestic transformer, the price is four times the domestic transfomer, the machine will be used only high-end HIFI Interface terminals are also relatively high, and gold-plated USB seat, Rui Shiniu Trek balanced output, Toshiba optical output head, Taiwanese custom gold-plated RCA, this is much better than the CMC, CMC is also twice the price With the top linear regulator power regulator chip, LT19631 and ADP150 Digital isolation transformer imported MuRata DA101C, not universally used cottage Pulse Gilded TCXO TCXO precision 0.1PPM Philips filter capacitor BC, Philips capacitors do not need much introduction, many European and American crew using digital decoupling for ELNA patch electrolytic, AVX tantalum capacitors[/left][/color]
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Thanks to MINORISUKE for the tip on this really nice unit!
 
Cheers!
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Mar 28, 2015 at 10:32 AM Post #1,011 of 3,701
hgpsemaj said:
  It looks very promising. I like the transformer separate with the main board.
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Totally agree - this makes sense from many perspectives.  And the Talema transformer is much higher quality.  The plug connection will allow a fairly easy and inexpensive mod to an R-core type of PS transformer..
 
In fact, the PS filtering and regulation is a major improvement over the Gustard U12.
 
Better clocking as well - with three TXCO's in the MXU8.
Murata isolation trans vs Pulse - I don't know if this makes a difference as many claim but would be interesting to hear.
 
Better SPDIF RCA connector.
 
Mar 28, 2015 at 12:31 PM Post #1,013 of 3,701
So here is the Talema the MXU8 uses - lot's of room for another better transformer
http://www.digikey.com/product-detail/en/70050K/1295-1025-ND/3881339
 
Room as well for clock boards and clock PS if needed.
 
Like a Rubidium clock:
 
http://www.head-fi.org/t/736294/gustard-u12-usb-interface-8-core-xmos-chip/900#post_11400946
 
PS
The Dexa Neutron Star Clock board:
http://www.partsconnexion.com/digital_dexans.html
http://www.newclassd.com/index.php?page=36
http://www.newclassd.com/index.php?page=37
 
Mar 29, 2015 at 1:16 AM Post #1,014 of 3,701
Looking at the highly rated Berkley Audio Design $1800 USB interface rated by a Computer Audio USB inter shootout as #1.

 
They use the Crystek TXCO clocks and XMOS chip - but look at the attention to detail on the PS board.  A separate board from the main one, very high quality Tamura transformer
 
Mar 29, 2015 at 10:58 AM Post #1,016 of 3,701
hgpsemaj said:
  If I'm wrong, please put me right, Berkeley's Alpha USB doesn't support DSD, but only offers POD.
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I believe you are correct and limited to 24 bit 192K PCM sampling no I2s input
 
The linear PS is one of the keys to the great sound for this USB interface
http://www.computeraudiophile.com/f6-dac-digital-analog-conversion/15-universal-serial-bus-industry-standard-cables-connectors-and-communications-protocols-between-computers-and-electronic-devices-spdif-converters-shootout-15327/
 
It uses the Crystek 957 clocks:
http://www.mouser.com/Search/Refine.aspx?N=4292773686&Keyword=CCHD-957
 
Mar 29, 2015 at 2:40 PM Post #1,017 of 3,701
rb2013 said:
Better clocking as well - with three TXCO's in the MXU8.
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Can anyone tell me the importance of the 3rd clock? I've found one in the Gustard too, but is it just the initial clock of the XMOS chip?
 
Just having more TCXOs doesn't do anything when only 2 are used for deriving the 2 subsets of frequencies; 1.) 44.1, 88.2, 176.4 and 2.) 48, 96, 192kHz. It looks good that the MXU8 has a third, but since we know it's not for output, then what's it do?
 
Mar 29, 2015 at 3:37 PM Post #1,018 of 3,701
benny-x said:
Can anyone tell me the importance of the 3rd clock? I've found one in the Gustard too, but is it just the initial clock of the XMOS chip?

Just having more TCXOs doesn't do anything when only 2 are used for deriving the 2 subsets of frequencies; 1.) 44.1, 88.2, 176.4 and 2.) 48, 96, 192kHz. It looks good that the MXU8 has a third, but since we know it's not for output, then what's it do?
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AFAIK the third clock is for the XMOS chip itself. Surely important but exactly how much is anyone's guess... usually, there's a better chance to find such info on sites like diyaudio.

Very curious how the new melodious converter compares to the U12 ... it surely has some theoretical potential.
 
Mar 31, 2015 at 12:45 PM Post #1,019 of 3,701
prot said:
AFAIK the third clock is for the XMOS chip itself. Surely important but exactly how much is anyone's guess... usually, there's a better chance to find such info on sites like diyaudio.

Very curious how the new melodious converter compares to the U12 ... it surely has some theoretical potential.
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Hi ! just to say me as well i am curious.
Regarding PS i guess a lot depends on the execution quality,
There are top digital units with SMPS
This is a very high quality unit from Meitner Audio  for instance 
 

so it depends
I guess it is easier to build a cheap and good linear than a cheap and good SMPS maybe ?
bye  
 
Mar 31, 2015 at 1:03 PM Post #1,020 of 3,701
Taking a look at how the Berkely and Melodious units carefully separate the transformer made me think I should open up my U12 and do more shielding.  I had previously done a lot of shielding of the crystals,  IC's and IEC socket with the 3M AB5100S, but I had not paid as much attention to the transformer itself.  I went back in and carefully constructed a double layered AB5100S hut around and over the entire transformer case.  To my ears, this had more of an audible effect than any of the other shielding, save only the huts I built around the clock crystals.
 
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