Shanti Dual LPS 5V/3A , 5V/1.5A

[terry22]

we are in the middle of audio testing (Rev)


I have another unit leaving tomorrow.

Thanx.

No measurements yet?

 

[cdsgames]

Rev latest testing was THD+N at -114 , THD at -120 to -124 (1Khz unweighted ) and around -125 at 18Khz

 

[randytsuch]

I'm using a usbridge sig for its usb output. I made a 5v PS with a couple ultracaps and a 78s05 to power it. Running dietpi for naa in a hqplayer setup. It upsamples everything to dsd256. DAC is a diy job made from a diyinhk usb adapter to an ian fifopi and an ian dac.

With the usbridge, I get pops/clicks, almost reminds me of vinyl but pops are same volume but happen at random times. Same setup, running from a highly tweaked pc is fine. I had tried "tweaking" dietpi, but it was worse that way. So I remade the sd card with the image from allo.com, running that image with no changes now.

Connections to usbridge are ethernet cable to a switch, usb cable to dac and +5VDC from my diy PS. Note the +5 is very stable, at 5.02V or something like that. I didn't tie ground point to anything.

I also used to use usb power to power the diyinhk adapter and the 5v part of the fifopi, but I put this stuff on it's own supply and it made no difference.

Suggestions?

Thanks
Randy

 

[cdsgames]

Yeap , wait for us to build a new image . Seems that kernel 4.19 has issues , we will try building it with kernel 4.14


USB audio suddendly has dropouts with 4.19.66 * Issue #3204 * raspberrypi/linux * GitHub

 

[terry22]

Rev latest testing was THD+N at -114 , THD at -120 to -124 (1Khz unweighted ) and around -125 at 18Khz

So, for this measurement, it’s about the same as Katana(-113), am I right?

 

[randytsuch]

Yeap , wait for us to build a new image . Seems that kernel 4.19 has issues , we will try building it with kernel 4.14


USB audio suddendly has dropouts with 4.19.66 * Issue #3204 * raspberrypi/linux * GitHub

OK, thanks for the quick reply.
I guess I should have asked earlier lol.

Randy

 

[matthiasw]

Yeap , wait for us to build a new image . Seems that kernel 4.19 has issues , we will try building it with kernel 4.14


USB audio suddendly has dropouts with 4.19.66 * Issue #3204 * raspberrypi/linux * GitHub

What about Moode?
They use kernel 4.19.75.
Thanks

Matt

 

[SanjeevM]

So, for this measurement, it’s about the same as Katana(-113), am I right?

THD+N figure is similar, but the sound output has the detailed sound of the THD version and softness of the SQ version of Katana. Katana has three stacked boards, Revolution has only one, which simplifies power requirements.

That's the deal.

 

[terry22]

THD+N figure is similar, but the sound output has the detailed sound of the THD version and softness of the SQ version of Katana.

Hi Sanjeev,
did you already heard it?

 

[cdsgames]

So, for this measurement, it’s about the same as Katana(-113), am I right?

Katana THD+N was -110 (unweighted )

 

[cdsgames]

What about Moode?
They use kernel 4.19.75.
Thanks

Matt

Any player using the kernel will have this issue. We are building an image of DietPi 4.14 and we are testing with the Mojo with just got in the office



This affects quite a few DACs and USB to i2s devices

 

[inca21]

Is there a major improvement of an eMMC vs SD Card?

 

[SanjeevM]

Hi Sanjeev,
did you already heard it?

Cdsgames has written so in one of his earlier posts in this thread.

 

[matthiasw]

Any player using the kernel will have this issue. We are building an image of DietPi 4.14 and we are testing with the Mojo with just got in the office
This affects quite a few DACs and USB to i2s devices

Does it affect Revolution DAC as well?
Thanks

Matt

 

[terry22]

Katana THD+N was -110 (unweighted )

Thank you for the info.

 

[cdsgames]

Does it affect Revolution DAC as well?
Thanks

Matt

Issues reported in DACs that don't support DSD native in Linux.


Revolution has no problems .

 

[Shutdown98]

Recieved the back plate for the USBridge-DigiOne sig case.
Thanks!

 

[cdsgames]

We have sent the OS images with 4.14 kernel (only for those DACs that don't support native DSD on linux, like Chord). That will fix "vinyl like pops"



Rest of DACs are not affected and you can use latest images from Moode. PCP , DietPI , Ropiee .


Thx you for the patience .

 

[hoqpus]

You sent it to whom?

Where can I download it?

 

[randytsuch]

You sent it to whom?

Where can I download it?

If you go here
USBridge Sig - Ultra low noise RPI

Click on Supported OS, then the DietPi directory, I see a DietPi version with today's date.

I expect that is the corrected version for the "pops" problem, but will wait for confirmation.
I didn't see anything else that was updated in a quick look at the files.