XMOS-based Asynchronous USB to I2S interface - Page 62 - diyAudio
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Old 24th April 2012, 12:06 PM   #611
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XMOS to PCM1794 schematic
USB DAC 2 - Hi-Resolution System
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Old 24th April 2012, 02:14 PM   #612
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Quote:
Originally Posted by audiodesign View Post
XMOS to PCM1794 schematic
USB DAC 2 - Hi-Resolution System
Andrea

The usb to i2s board got a +5V pin at the Isolated I2S Outputs. Where do you connect this terminal for connection with PCM1794 chip ? Will it works if I ignore this connection ?

Regards
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Old 24th April 2012, 02:24 PM   #613
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I have used only 2 power regulators, +5V for all the digital section and +5v VANA for the analog section.
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Old 24th April 2012, 02:36 PM   #614
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Originally Posted by audiodesign View Post
I have used only 2 power regulators, +5V for all the digital section and +5v VANA for the analog section.
From the picture I see 5v pin (of the usb to i2s card) is connected to Vdd of the pcm1794. I this necessary when 5v psu is connected to the converter ?
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Old 24th April 2012, 02:42 PM   #615
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see this and photos
Attached Images
File Type: gif XMOS_PCM1794_sch1_power.gif (90.9 KB, 699 views)

Last edited by audiodesign; 24th April 2012 at 02:46 PM.
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Old 24th April 2012, 02:53 PM   #616
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Originally Posted by audiodesign View Post
see this and photos
Thanks for the photo. You made your point now when all 5v terminal needs to be connected.
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Old 24th April 2012, 03:08 PM   #617
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If you want to isolate the ground of the USB-I2S module use a different power supply for this.

It means another transformer secondary, another bridge, another CRC and another LT1086.

In this case the heatsink is necessary only for the LT1086 connected to the USB-I2S module.
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Old 24th April 2012, 03:28 PM   #618
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The ground isolation should be better but ......

How to be sure that the two different gnd does not exceed the maximum voltage allowed by IL715, 2500 VRMS Isolation for 1 min. ?

How to connect the 2 power supply gnd to the chassie for the screen ? probably the solution is use only a cap. instead of 100 ohm resistor

Have someone build a comparison test with coax output and IL715 outputs ?

Now I don't know where buy coax cables to use the other outputs.
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Old 24th April 2012, 03:56 PM   #619
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Originally Posted by PET-240 View Post
Hey Lucian,

Is there a thought to make the wave do 384kHz or dsd? Not that I have any at that sample rate.....just curiosity....!

Thanks,

D.
Yes, there are thoughts but if WaveIO will have these features or not, time will tell... If there any chances though, then I'll do my best for these features to be implemented; if not, I would prefer to be silent

Quote:
Originally Posted by audiodesign View Post
[...]
Now I don't know where buy coax cables to use the other outputs.
mBNC receptacles (U.FL) used for WaveIO can be found here while coax cables here.
Kind regards,
L
__________________
Contact link for WaveIO USB-to-I2S/SPDIF board.
Daughter card GB list for WaveIO can be found here

Last edited by Lorien; 24th April 2012 at 04:07 PM.
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Old 25th April 2012, 07:46 AM   #620
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Quote:
Originally Posted by audiodesign View Post
Now I don't know where buy coax cables to use the other outputs.
If you're in search of a cheap option, this is a useful link
Laptop Desktop Notebook Networking WI-FI Card Mini PCI-E U.FL Internal Antenna | eBay

I've just received Lucian's board.
First thing to say is about Lucian, a very kind person, and then, excellent packaging and quick shipping. The card manufacturing is of high quality, professional, I'd say.
My actual setup is based on: AsusF5VL-VistaHP notebook, flac library on external usb hd, foobar 1.1.11 with soX output @96k, std 3m usb cable, externally powered (7808 linear ps) Teralink X2 feeding a TP Opus 8740 via non-isolated I2S.
WaveIO will replace X2 from tomorrow on.
Attached Images
File Type: jpg uBNC.jpg (45.1 KB, 608 views)

Last edited by m.massimo; 25th April 2012 at 07:48 AM.
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