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Old 2nd September 2011, 03:14 PM   #211
1audio is offline 1audio  United States
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Can you provide specifics for the mailing lists?
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Demian Martin
Product Design Services
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Old 2nd September 2011, 10:32 PM   #212
borges is offline borges  Norway
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Join Date: Dec 2003
Location: Oslo, Norway
Main project pages:
sdr-widget - Audio and Control Interface for Amateur Radio SDR and Audiophile USB-DAC - Google Project Hosting
https://groups.google.com/group/audio-widget?hl=en

It's been a while since I actually joined the projects, so I don't remember the details. Cookies log me in whenever I go there...

BÝrge
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Old 3rd September 2011, 08:45 AM   #213
Frex is offline Frex  France
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Hello borges ,

I just discover this thread and the project seem to be very very interesting !
I use for a year now a linux OS on my computer, and i looked to get a good USB audio device for listening music.
A device supporting high sampling rate is also one of my requirement.

Please, can you confirm me that your AB-1.1 board support Linux OS (with drivers) and all sampling rate to 192kHz and resolution between 16-24 bits ?
On your post #210, you speak about a price of 120$, what is included for that price ?
(Sorry if the info has already been said, i don't found it !).
Regards, and thank you very much for sharing this high-end projects!

Frex
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Old 3rd September 2011, 10:30 AM   #214
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Hi Frex,

On Linux (kernel 2.6.38 or later) the audio-widgets are supported by the native USB Audio Class 2 (UAC2). No drivers needed.

You will need to download a GUI utility called WidgetControl.py GUI tool from the Google Project Hosting link:

Downloads - sdr-widget - Audio and Control Interface for Amateur Radio SDR and Audiophile USB-DAC - Google Project Hosting

You will need python, pyusb, pythoncard etc. to be installed in your Linux machine to run this GUI.

With the GUI, you can configure the firmware for UAC2 (instead of the default UAC1 for Windows compatibiilty). Under UAC2, the audio-widgets are capable of 44.1/48/88.2/96/176.4/192khz. The USB transfer is at 32 bits, but only the most significant 24 bits are actually transferred to the ES9023 DAC. If you play 16bit music, the other 8 bits are padded to zeros by Linux.

The audio-widget can be set up to be used with pulseaudio. However, to get the most out of pulse, you need to setup pulse correctly using the .pulse/daemon.conf file.

The best player I have found is MPD. You can setup the .mpdconf file so that there is no auto-resampling. So whatever the source material sampling rate is, the same sampling rate is set for the audio-widget and the samples transferred are "bit-perfect".

You should join the audio-widget Google group and read all the archived info if you are interested.

Alex
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Old 3rd September 2011, 06:16 PM   #215
borges is offline borges  Norway
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Yes, and I may add the same tools are available on Windows too. The SDR-Widget project Wiki has the details.

BÝrge
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Old 3rd September 2011, 06:18 PM   #216
borges is offline borges  Norway
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Hi Frex,

the $120 price is for a boxed, tested, assembled kit. It plays music right out of the box. It even comes with a nice logo on the front!

Shipping without tracking number is $18 to Europe and $31 world-wide. Mail / PayPal me at borge.strand@gmail.com if you wish to get a kit.

Cheers,
BÝrge

Quote:
Originally Posted by Frex View Post
Hello borges ,
On your post #210, you speak about a price of 120$, what is included for that price ?
Frex
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Old 3rd September 2011, 11:14 PM   #217
borges is offline borges  Norway
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Hi guys,

I just brought up a new web site for the USB-I2S module and AB-1.1. Link is in signature!

BÝrge
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Old 4th September 2011, 08:50 AM   #218
Frex is offline Frex  France
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Quote:
We are conducting audio characterization of our prototype boards (the AB-1 and a single board USB9023) this week and hopefully we will have some lab measurement results soon.

Alex
Hello,

Thank you for the answers borges.
Does anyone has made some audio measurements on it, like alex speak about on post 21 ?
Does I2S signal is easily available ? in order to use another DAC IC ?

Regards.
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Old 4th September 2011, 09:03 AM   #219
borges is offline borges  Norway
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Join Date: Dec 2003
Location: Oslo, Norway
Hi Frex,

using another DAC is a main feature of the design! If you look at the schematics (follow link in my signature), you'll see the pinout for the interface between module and analog board. There you can insert pretty much any DAC you wish.

We've hunted down some UAC1 bugs lately. I only now feel that UAC1 is stable enough to perform listening tests. I have invited the members in Oslo Audio Society to take part in this. For this purpose I will probably take two kits, one with 1.5nF filter caps, the other with 4.7nF. Just to see if there is a preference.

Cheers,
BÝrge
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Old 4th September 2011, 12:24 PM   #220
Frex is offline Frex  France
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Join Date: Nov 2009
Ok, very good.

Is that possible to buy only the daughter board without the ES9023 DAC board ?
If yes at what conditions ?
Thank's .
Regards.

Frex
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