XMOS-based Asynchronous USB to I2S interface - Page 3

Lorien · 6th June 2011, 07:00 PM

PSUs, mostly yes, though I consider this board still have a very good power supply network given the fact that XMOS chip is a "little" power hungry

DC-DC will be next thing, to keep power consumption down and minimize heat dissipation, but only after I'll find a way to isolate the I2S outputs from USB (whatever that means). I'm still thinking on how to do it... properly... without GMRs or other jittery devices.
On the other hand i want the best PSu for oscillators and it's hard to decide which PSu will fit all requirements! I was thinking to add W.Jung-like vregs for each oscillator in part. Shunts are also good enough (maybe better?)... I just don't know for now which one will be...
Regards,
L

qusp · 7th June 2011, 05:04 PM

400ma shunts will be a little bit hungry yes?

barrows · 7th June 2011, 05:54 PM

that is why I only would suggest shunt(s) if an external supply (not USB bus) was mandated. Running a shunt for only the clocks alone could result in a nice improvement (and the clock reg should not require too much current) as the low output impedance of the shunt should keep the rest of the power supplies from getting modulated by the clock frequency. Perhaps adding just a single shunt for the clocks, and keeping linear regs for the the other supplies...
Just thinking out loud here.

Lorien · 8th June 2011, 02:13 PM

I agree with barrows! Now, on this board there are three LP5900 Vreg chips: one for each oscillator in part and the third one is for I2S output logic.... and this only just to keep noise down as much as I can! Given this, it's hard for me to believe that I'll choose one shunt reg to power all clocks (excluding surrounding I2S logic).
So, if performance needs a little more power then I'll choose the external PSU path leaving the USB 5V supply for another time.
I'm still in with 1 x Walter Jung - like PSU followed by two shunt regs (one for each oscillator in part). Barrows?

new2hifi · 8th June 2011, 10:42 PM

Hi:

I have been looking for such a board and want to praise your layout and options. The header out option for I2S is excellent, this way one can quickly try different cables and connection to different DACs. I liked the way you have given terminal input for external power supply. However, the best is the option to have two USB connections especially one with the header out so one can run cable to chassis thus mounting board really close to target I2s input for minimum I2S cables length.

Regards

spencer · 25th June 2011, 12:39 PM

How does the measurements compare to the XMOS reference design? I means at SPDIF out and I2S out? Any graph comparison is good especially on Jitter and noise figures. If possible, please show how the test is conducted and equipment used.

Thank you.

Zero Cool · 26th June 2011, 03:17 AM

Very Nice board! Please let me know when you have these available for sale!

Lorien · 26th June 2011, 04:41 PM

Quote:

Hi:

I have been looking for such a board and want to praise your layout and options. The header out option for I2S is excellent, this way one can quickly try different cables and connection to different DACs. I liked the way you have given terminal input for external power supply. However, the best is the option to have two USB connections especially one with the header out so one can run cable to chassis thus mounting board really close to target I2s input for minimum I2S cables length.

Regards

Thank you!

Quote:

How does the measurements compare to the XMOS reference design? I means at SPDIF out and I2S out? Any graph comparison is good especially on Jitter and noise figures. If possible, please show how the test is conducted and equipment used.

Thank you

When I'll have the required informations I'll post them asap. For now, there are two members of this forum which could do noise and jitter tests and I'm still waiting an answer.

Quote:

Very Nice board! Please let me know when you have these available for sale!

I still have few boards for sale... but my free time is absent thus I didn't had the chance to build up my site to reflect that.

Kind regards,
L

Betterheart · 29th June 2011, 12:36 PM

Do you ever hook this I2S to BII, if that sound great with ASIO driver. I would like to buy 1 board. Pls send price and transfer method to my email.

Regards
poonchaimd@gmail.com

new2hifi · 4th August 2011, 12:44 AM

Hi All:

Just sharing my experience of purchasing and using the board from Lorien.

It works wonderfully. Everything is good and working. It turned out to be the way I expected, excellent. I used the interface board both with external power and USB power. I used the isolated I2S outputs to Philips TDA1541A DAC chip by providing the GMR with 5V. It has different but positive sound. It is little laid back, taken the bite off my tweeters, wider soundstage and much natural/organic sound than M2Tech HiFace (USB to S/PDIF) which is infamous for forward sound.

Again, excellent dream options to evaluate things that I don't see on any other board. Quality and inexpensive solution.

7th June 2011, 05:54 PM	#23
barrows diyAudio Member Join Date: Jul 2010	Yeah... that is why I only would suggest shunt(s) if an external supply (not USB bus) was mandated. Running a shunt for only the clocks alone could result in a nice improvement (and the clock reg should not require too much current) as the low output impedance of the shunt should keep the rest of the power supplies from getting modulated by the clock frequency. Perhaps adding just a single shunt for the clocks, and keeping linear regs for the the other supplies... Just thinking out loud here.

8th June 2011, 10:42 PM	#25
new2hifi diyAudio Member Join Date: Sep 2010	Excellent optios Hi: I have been looking for such a board and want to praise your layout and options. The header out option for I2S is excellent, this way one can quickly try different cables and connection to different DACs. I liked the way you have given terminal input for external power supply. However, the best is the option to have two USB connections especially one with the header out so one can run cable to chassis thus mounting board really close to target I2s input for minimum I2S cables length. Regards

26th June 2011, 03:17 AM	#27
Zero Cool Audio Junkie diyAudio Member Join Date: Sep 2004 Location: MN	Very Nice board! Please let me know when you have these available for sale! __________________ It's not about what you can BUY...It's about what you can BUILD!

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6th June 2011, 07:00 PM	#21
Lorien diyAudio Member Join Date: Nov 2007	PSUs, mostly yes, though I consider this board still have a very good power supply network given the fact that XMOS chip is a "little" power hungry DC-DC will be next thing, to keep power consumption down and minimize heat dissipation, but only after I'll find a way to isolate the I2S outputs from USB (whatever that means). I'm still thinking on how to do it... properly... without GMRs or other jittery devices. On the other hand i want the best PSu for oscillators and it's hard to decide which PSu will fit all requirements! I was thinking to add W.Jung-like vregs for each oscillator in part. Shunts are also good enough (maybe better?)... I just don't know for now which one will be... Regards, L

7th June 2011, 05:04 PM	#22
qusp Sometimes a square peg fits a round hole just fine diyAudio Member Join Date: Oct 2009 Location: Brisbane, Australia	400ma shunts will be a little bit hungry yes?

8th June 2011, 02:13 PM	#24
Lorien diyAudio Member Join Date: Nov 2007	I agree with barrows! Now, on this board there are three LP5900 Vreg chips: one for each oscillator in part and the third one is for I2S output logic.... and this only just to keep noise down as much as I can! Given this, it's hard for me to believe that I'll choose one shunt reg to power all clocks (excluding surrounding I2S logic). So, if performance needs a little more power then I'll choose the external PSU path leaving the USB 5V supply for another time. I'm still in with 1 x Walter Jung - like PSU followed by two shunt regs (one for each oscillator in part). Barrows?

25th June 2011, 12:39 PM	#26
spencer diyAudio Member Join Date: Jun 2004 Location: Hong Kong	How does the measurements compare to the XMOS reference design? I means at SPDIF out and I2S out? Any graph comparison is good especially on Jitter and noise figures. If possible, please show how the test is conducted and equipment used. Thank you.

29th June 2011, 12:36 PM	#29
Betterheart diyAudio Member Join Date: Nov 2007	Do you ever hook this I2S to BII, if that sound great with ASIO driver. I would like to buy 1 board. Pls send price and transfer method to my email. Regards poonchaimd@gmail.com

4th August 2011, 12:44 AM	#30
new2hifi diyAudio Member Join Date: Sep 2010	Hi All: Just sharing my experience of purchasing and using the board from Lorien. It works wonderfully. Everything is good and working. It turned out to be the way I expected, excellent. I used the interface board both with external power and USB power. I used the isolated I2S outputs to Philips TDA1541A DAC chip by providing the GMR with 5V. It has different but positive sound. It is little laid back, taken the bite off my tweeters, wider soundstage and much natural/organic sound than M2Tech HiFace (USB to S/PDIF) which is infamous for forward sound. Again, excellent dream options to evaluate things that I don't see on any other board. Quality and inexpensive solution.

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