Simple DSD SRC for BeagleBone

[ppy]

Will the firmware you are developing also supprt SD card as a music source?

Not. This firmware works in audio endpoint mode. I don't want to implement player functions in this firmware.

P.S.
While waiting PCB boards for this project, the firmware has evolved quite a lot. You can get acquainted with the beta versions: Botic7 — Yandex.Disk

Description and changelog in Russian. But for the release, I will prepare documentation in English.
Temporarily support for this firmware on the Russian forum:
Сетевой плеер на Beaglebone Black — чистое удовольствие - Цифровые источники - DA Stereo

 

[ppy]

Hi PPy I was wondering if it is possible, with the same conversion quality, to use jriver to convert to 176/192 and then only use one AK4137 to convert to DSD

Yes, it is possible. But I want to make a completely hardware solution.

 

[chientechnical]

Better more if you can add the AK4118 for Spdif input.

 

[ppy]

Botic driver can output SPDIF signal by itself. No need for AK4118.
But most DACs do not support DSD over SPDIF. So I see no point in SPDIF output.

 

[chientechnical]

I mean are: Spdif -> AK4118/BBB (switch select) -> AK4137 convert -> DSC.

 

[koldby]

Is it possible to get the BB to put out 4 channels of audio?. Only 2 of the four channels have to be converted to DSD through the dual AK4137. Actually what I need is just an I2S out for the extra 2 channels. I want the extra 2 channels for subwoofer use

 

[ppy]

First start.
In my opinion, the conversion quality to DSD256 is not worse than that of Roon.

P.S. The schema posted at the beginning of this thread has errors. I will publish a complete set of documents for fabrication soon.

 

[ppy]

Is it possible to get the BB to put out 4 channels of audio?. Only 2 of the four channels have to be converted to DSD through the dual AK4137.

Yes, you can. But the connector is not provided for additional channels. You will have to independently connect to the P9.

 

[chientechnical]

First start.
In my opinion, the conversion quality to DSD256 is not worse than that of Roon.

P.S. The schema posted at the beginning of this thread has errors. I will publish a complete set of documents for fabrication soon.

What the firmware using match to your AK4137 board.
Botic7 — Yandex.Disk

 

[ppy]

Next firmware.
I haven't finished setting up the AK4137 registers yet.

 

[nautibuoy]

Good work Pavel, it looks promising and your efforts are much appreciated.

A question if I may; is there a possibility of having an OLED type user interface like some of the ebay AK4137 boards?

 

[ppy]

BeagleBone is a powerful platform. Everything is limited only by your ideas and fantasies.
I had no plans to make hardware indication. Everything can be displayed via the firmware web interface. I was recently helped with the webdesign of the "Pure" firmware. In the future, I will expand it.

 

[chientechnical]

Next firmware.
I haven't finished setting up the AK4137 registers yet.

Tks so much.
I found the empty pcb are very large. The original diagram is also buggy. If you re-layout, please add Crystek Clock parallel with NDK Clock.

 

[nautibuoy]

BeagleBone is a powerful platform. Everything is limited only by your ideas and fantasies.
I had no plans to make hardware indication. Everything can be displayed via the firmware web interface. I was recently helped with the webdesign of the "Pure" firmware. In the future, I will expand it.

That works for me too...

 

[ppy]

This project has been completed. Sound quality is quite high.

I offer two options:

1. For DSC 2.6.2 + U.FL output.
2. For DSC 2.5.2

The firmware Pure is compatible with BeagleBone Black, BeagleBone Green, and AntMiner.

Complete set of documentation for self production.
DSD`it — Yandex.Disk

 

[Markw4]

Nice project. IME it should sound far better than CT7302 🙂

 

[chientechnical]

This project has been completed. Sound quality is quite high.

I offer two options:

1. For DSC 2.6.2 + U.FL output.
2. For DSC 2.5.2

The firmware Pure is compatible with BeagleBone Black, BeagleBone Green, and AntMiner.

Complete set of documentation for self production.
DSD`it — Yandex.Disk

Tks u. I'm quick the try it.

 

[ppy]

There are simplified SBCs based on BeagleBone - AntMINER L3 and D3

They can be purchased for as little as 5-10$.
I recommend using these boards. There is nothing extra on these boards that can affect the sound.
Pure firmware has been adapted to work on these devices.

 

[Ipoci]

1. For DSC 2.5.2

If any of you think about building an additional board for dsc2.5.2, I am interested in buying it

 

[nautibuoy]

Thank you Pavel.