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USB to I2S:  M2Tech vs XMOS vs Open-source Qnktc
USB to I2S:  M2Tech vs XMOS vs Open-source Qnktc
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Old 21st April 2012, 05:39 PM   #41
juanito is offline juanito  Europe
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Quote:
Originally Posted by audiodesign View Post
I sell the M2Tech USB to I2S module by AckoDAC (https://sites.google.com/site/ackodac/home) at 80 euro + shipping
Hi, may be I'm on the wrong thread, but now I see you tested QNKTC DAC: have you had any issues with this DAC and Mac OSX?

I have this DAC. With windows and Asio plus Foobar 2000 it works perfect. But I recently bought an Imac with OSX (snow leopard) and when using this DAC with itune or VLC media player or Cog player (there is no foobar for mac), after a while I have distortion in sound. It's very strange because it works fine for a few songs and then it's a kind of electric distortion. I'm going to install a windows partition and try also. But it surprise me because I saw that OSX doesn't need any Asio drivers, it's natively. I also changed settings with Midi Application, but nothing at all goes on.
Well if you heard any thing similar with these Dac's and OSX I would appreciate much your help.
Thanks. Bye.
JOHN
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Old 21st April 2012, 06:57 PM   #42
audiodesign is offline audiodesign  Italy
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Try the player used by me
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Old 21st April 2012, 07:17 PM   #43
MrSlim is online now MrSlim  Canada
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Quote:
Originally Posted by juanito View Post
Hi, may be I'm on the wrong thread, but now I see you tested QNKTC DAC: have you had any issues with this DAC and Mac OSX?

I have this DAC. With windows and Asio plus Foobar 2000 it works perfect. But I recently bought an Imac with OSX (snow leopard) and when using this DAC with itune or VLC media player or Cog player (there is no foobar for mac), after a while I have distortion in sound. It's very strange because it works fine for a few songs and then it's a kind of electric distortion. I'm going to install a windows partition and try also. But it surprise me because I saw that OSX doesn't need any Asio drivers, it's natively. I also changed settings with Midi Application, but nothing at all goes on.
Well if you heard any thing similar with these Dac's and OSX I would appreciate much your help.
Thanks. Bye.
JOHN
You'd probably be better served by posting your question on this thread:
http://www.diyaudio.com/forums/digit...io-widget.html
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Old 27th April 2012, 01:41 AM   #44
2A3SET is offline 2A3SET  Canada
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Default Passive I/V for 1955

Andrea,

Can we run AD1955 passive like this to be compliant with the datasheet? With 2K load, there should be about 400mv RMS at output.

Thanks
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File Type: jpg ad1955out.jpg (18.8 KB, 716 views)

Last edited by 2A3SET; 27th April 2012 at 01:56 AM.
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Old 27th April 2012, 07:16 AM   #45
audiodesign is offline audiodesign  Italy
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I have tested many configurations with AD1955 and output transformers but always I get bad results (http://www.ti.com/lit/an/slaa399/slaa399.pdf).

To get a flat frequency response and low distortion the best method is a pure resistor followed by a high impedance stage like a vacuum tube.

The 200 ohm value has been found after many test from 47 to 2Kohm.

I should receive soon the first pcb of my hybrid output stage.
USB DAC 2 - Hi-Resolution System

Qh (http://www.quanghao.com/)will sell these pcb and the complete kit at very low cost.
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Old 27th April 2012, 12:50 PM   #46
2A3SET is offline 2A3SET  Canada
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Thanks Andrea, looking forward to your SEN I/V test.

Quote:
Originally Posted by audiodesign View Post
I have tested many configurations with AD1955 and output transformers but always I get bad results (http://www.ti.com/lit/an/slaa399/slaa399.pdf).

To get a flat frequency response and low distortion the best method is a pure resistor followed by a high impedance stage like a vacuum tube.

The 200 ohm value has been found after many test from 47 to 2Kohm.

I should receive soon the first pcb of my hybrid output stage.
USB DAC 2 - Hi-Resolution System

Qh (http://www.quanghao.com/)will sell these pcb and the complete kit at very low cost.
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Old 8th May 2012, 03:31 PM   #47
audiodesign is offline audiodesign  Italy
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Here the controller to get data from XMOS module and configure any DAC like AD1955, DSD1794, ES9018 ....

IR remote command for the volume and mute.

M2Tech and Open-source Qnktc sold.
Attached Images
File Type: gif ControllerSCH.gif (24.2 KB, 582 views)
File Type: gif ControllerPCB.gif (22.6 KB, 566 views)

Last edited by audiodesign; 8th May 2012 at 03:33 PM.
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Old 8th May 2012, 04:05 PM   #48
Telstar is offline Telstar  Italy
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Quote:
Originally Posted by audiodesign View Post
Here the controller to get data from XMOS module and configure any DAC like AD1955, DSD1794, ES9018 ....

IR remote command for the volume and mute.
The volume attenuation uses the extra 8 bits of the xmos chip?
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"The total harmonic distortion is not a measure of the degree of distastefulness to the listener and it is recommended that its use should be discontinued." D. Masa, 1938
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Old 8th May 2012, 04:10 PM   #49
audiodesign is offline audiodesign  Italy
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Which bits ?

The volume use the special DAC function of the new DAC chips so no lost in resolution and no changes on on the analog signal
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Old 8th May 2012, 04:30 PM   #50
Telstar is offline Telstar  Italy
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Originally Posted by audiodesign View Post
Which bits ?

The volume use the special DAC function of the new DAC chips so no lost in resolution and no changes on on the analog signal
Nevermind then.
I didnt know also dsd1794 had a volume function.
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