XMOS-based Asynchronous USB to I2S interface

[audiodesign]

XMOS to PCM1794 schematic
USB DAC 2 - Hi-Resolution System

[gabanyayaya]

Originally Posted by audiodesign

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

[audiodesign]

I have used only 2 power regulators, +5V for all the digital section and +5v VANA for the analog section.

[gabanyayaya]

Originally Posted by audiodesign

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 ?

[audiodesign]

see this and photos

[gabanyayaya]

Originally Posted by audiodesign

see this and photos

Thanks for the photo. You made your point now when all 5v terminal needs to be connected.

[audiodesign]

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.

[audiodesign]

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.

[Lorien]

Originally Posted by PET-240

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

Originally Posted by audiodesign

[...]
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

[m.massimo]

Originally Posted by audiodesign

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.