The USB-I2S Module and AB-1.2 are implementations of the Audio Widget open source project. It is a fork
of the SDR Widget project. The units on these pages will give you open source USB audio in a modular design.
Even the ASIO driver for Windows UAC2 is open source!
The USB-I2S Module is designed to fit any USB audio DAC design. With this module you can add your own
analog board. For optimal audio quality, the analog board has to provide MCLK to the USB-I2S Module.
The module outputs I2S and has lots of other IO. It is fully assembled and tested.
AB-1.2 is a complete boxed and tested USB DAC kit. It will play music pretty well, right out of the box. The USB-I2S Module is included.
The analog board is designed for easy tweaking. Use it as an evaluation kit for the USB-I2S Module. Or use it
as a starting point for your own experiments. If you don't plan to do any soldering, this is the best starting point.
The AB-1.2 USB DAC is expected in Mid-June. But it is possible to pre-order it now.
AB-1.12 and AB-1.13 are two unassembled prototype boards sold in one package. With the AB-1.12 and AB-1.13 you will
be able to prototype with the AK4430, PCM5102, ES9012/18, SPDIF output and I2S-over-CAT5 output. The required
crystal oscillators are in the package. But no other components are. The AB-1.12 and AB-1.13 is great if you already
own a USB-I2S Module. If you don't already have a module, go for:
Important web pages are found here:
Start here: Audio Widget Readme file
Windows 7 instructions for Driver Cleanup and Driver Installation
SDR-Widget Homepage,
Wiki and
Project Downloads
Audio-Widget Mail Archive
Firmware Source Code
Windows ASIO Driver Download and
Source ode
diyAudio Discussion Thread (English)
HifiSentralen Discussion Thread (Norwegian)
Audiofaidate Discussion Thread (Italian)
AUDIO PLANET Discussion Thread (Spanish)
Some specifications:
Fill in your wishes and currency here, or anywhere on this website. Payment is through PayPal. USD prices are for international purchases. NOK prices include tax (mva.) for Norwegian purchases.
Volume discounts and formal invoices are available. If you are interested in buying several units, please contact me at borge@qnktc.com. Shipping is by regular mail. This option works very well. But if you wish to use a courier just contact me before placing an order. I take no responsibility for the safe arrival of goods in Russia.
The AB-1 and AB-1.1 are the predecessors of AB-1.2. These kits are no longer sold. If you own one, consult these web pages for
information about your system. If you don't own one you may ignore these links.
AB-1
AB-1.1
Q: Do I have to be a programmer to use the USB-I2S module and AB-1.2?
A: No, you don't. It plays music right out of the box. But you may have to install new firmware. That pretty much means following a quite doable procedure of driver installs, button pushes and DOS/shell commands.
Q: Do I have to be an analog hacker to use the USB-I2S module and AB-1.2?
A: No. But if you have a soldering iron you can tweak it. The kit is not a finished product. Although it works very well, it is designed as a starting point for DIYers. If you wish to try the AB-1.12 / AB-1.13 boards, SMD soldering experience is required.
Q: I am a programmer. Where do I start?
A: Visit the project links at the top of this page and join both SDR-Widget and Audio-Widget mailing lists. There is very little cross-posting. The SDR-Widget Wiki is a good starting point. It explais the git repository and other details.
Q: Which coding efforts are wanted?
A: We're always trying to improve on the MCU firmware. Our most pressing issue right now is Windows driver support. If you're familiar with Audio processing / USB / Windows drivers / Linux drivers, or related things, please join our efforts.
Q: I like analog tweaking. Where do I start?
A: It is very possible for you to design your very own Analog Board and fit the USB-I2S module on it. Such a board must include DAC, clocks and PSU. But if you don't want to make the whole thing from scratch, feel free to download the AB-1.2 schematics and see if there are areas where your knowledge can improve on things. Oh, and please feed your knowledge back to the group members.
Q: I'd like to reuse the PCB designs for a commercial project. What do I do?
A: Contact me at borge@qnktc.com. I have years of experience in commercial PCB design and manufacturing. We'll sort something out!
Q: The diyaudio thread is huge. Where do I look?
Capacitors posts
670,
756,
763,
854,
867
Linux player posts
758-759,
800
Layout, back panel posts
819,
825,
831
Test results post
819 currently evolving...
Jtest posts
761,
776,
781 currently evolving...
Feel free to suggest other highlights!!
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ASIO is a trademark and software of Steinberg Media Technologies GmbH
Q N K T C develops and sells audio electronics.
Contact information:
Q N K T C
Solhaugveien 86A
1337 Sandvika
Norway
borge@qnktc.com
Tel: +47 90639918
Norwegian company registration number (org.nr): 986 023 739 MVA