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XMOS-based Asynchronous USB to I2S interface
XMOS-based Asynchronous USB to I2S interface
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Old 14th January 2019, 11:14 AM   #3201
Extreme_Boky is offline Extreme_Boky
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Shorter return path would do better
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Old 14th January 2019, 11:15 AM   #3202
deduikertjes is offline deduikertjes  Netherlands
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Quote:
Originally Posted by Extreme_Boky View Post
Shorter return path would do better
But that gives ground loops as an added bonus. Or am I misunderstanding something?
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Old 15th January 2019, 08:27 AM   #3203
Lorien is offline Lorien
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The idea is to keep the short return paths since the digital I2S signals are 'fast' ones and I remember clearly that return path for these kind of signals is closest to their related "hot" wire. If you'll force them to take a bigger route just to avoid ground loops then it is possible to degrade their integrity (increase overshoots and ringing).
If you really want to keep a short path while avoid ground loops then I do recommend you to try out some stitching caps. of 100nF or so placed in series with the short ground path. Look here at page 10 and you will see what I mean.
Cheers,
L
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Old 15th January 2019, 01:59 PM   #3204
Ryelands is offline Ryelands  United Kingdom
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Quote:
Originally Posted by phi112358 View Post
Is it better to use a separate PSU if the DAC already has its own dedicated PSU?
Ever since I bought my first WaveIO in 2011, I have connected them to the DAC via the WaveIO's isolator chip using the DAC's +5v line. This called for a lead about 120mm long between the DAC and the isolator chip.

I don't know why recent attempts to connect the two directly via u.fl connectors failed but suspect an earthing issue given that the two devices have separate Uptone Audio LPS-1s set to 7v with LT3045 Vregs mounted as close as possible to the load. (The Meanwell SMPSs that drive the LPS-1s are connected to the mains via isolating transformers.)

On a whim, I recently tried fitting a 5v LDOvr LT3045-based Vreg directly to the isolator chip via short (10-15mm) leads and connecting the Vreg to the DAC's "raw" PS via carefully screened leads. In short, I now have one 5v Vreg for the DAC and another for the isolator chip.

The result was a very marked improvement in sound quality, more "transparent", better bass, all the usual stuff. In short, I don't think the isolator chip needs its own PS but it does greatly benefit from its own Vreg. A significant upgrade for an insignificant cost. Lorien is right.

Again, dammit.

HTH

D
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Old 17th January 2019, 12:46 PM   #3205
chermann is offline chermann  Austria
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Hi

After a long search for an "better" DAC i landed at Gustard A20H. I use this DAC over usb. Triggered from an other threat i try the first time a purifier (ifi nano iUSB 3.0)..first sound checks are promising...will see.

now my question:
can i expect a better SQ over an USB to I2S converter into my DAC ??
If yes which board or complete interface can you prvide me?

thanks you in advance
chris
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Old 21st January 2019, 08:34 PM   #3206
chermann is offline chermann  Austria
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Hi again


Sorry my ignorance to think that i get an easy answer. i start to read the first 60 pages ....my head is burning....


.. after read, learn and decide i will try an usb to I2S board to connect it...but this takes time


chris
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Old 22nd January 2019, 09:17 PM   #3207
weissi is offline weissi  Austria
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Chermann, in your case, owning a DAC with presumably well designed Xmos implementation and outfitted with possibly very good clocks, there is not much to be gained.
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Old 23rd January 2019, 07:56 AM   #3208
chermann is offline chermann  Austria
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Quote:
Originally Posted by weissi View Post
Chermann, in your case, owning a DAC with presumably well designed Xmos implementation and outfitted with possibly very good clocks, there is not much to be gained.
Hi Weissi

i am very sorry for my nooby statements but i start since 1 year with diy....and with my mod of UD301 very nooby

as i read mor here in the digital line level i get more and more hungry for some future modifications (teac UD301)

Thank you for your positiv statement to my DAC which i got in 01/2017. after a journey of aune 16, Brooklyn, RME + Mutec 3...etc

chris

Last edited by chermann; 23rd January 2019 at 08:06 AM.
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Old 1st April 2019, 04:29 PM   #3209
AlexanderTD is offline AlexanderTD  Ukraine
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Hello there,
Tried to update firmware to DSD and got error message...
Update: Ah, i didn't find the right post in time - found everything needed in driver archive...

Last edited by AlexanderTD; 1st April 2019 at 04:53 PM. Reason: Update
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Old 1st April 2019, 06:05 PM   #3210
AlexanderTD is offline AlexanderTD  Ukraine
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Can't get DSD playing with WaveIO V6.C7 firmware + 4.14 driver. Foobar is playing but no sound from my Buffalo DAC (SACD, DSD proxy, foo_dsd and all that installed). Tried Jriver but when set to bitstream output DSD a lound "white" noise is played.
If anyone used some sort of guide of how to setup players which worked and can share a link i'd be thankfull!
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