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G

glt

Member
Joined 2004
diyaudio.com/forums/showthread.php?s=&threadid=140669
Just a word in case you feel like adding an external controller such as an Arduino later.

The bundled Xmos usb interface controls the digital volume in the DAC through the I2C bus (it uses the s/w volume control in your computer). If you wish to use an external controller for volume contro (such as using an Arduino), then you will have to purchase an Xmos interface that does not use the I2C bus such as this:
XMOS DSD DXD 384kHz high-quality USB to I2S/DSD PCB - DIYINHK
 
M

misak

Member
Joined 2012
If you want use Xmos module alone, than you need some power supply.
If you will use it together with DAC, Xmos is taking voltage from DAC board
over connector CN1 - look here
http://www.diyinhk.com/shop/216-thickbox_default/xmos-dsd-dxd-384khz-high-quality-usb-to-i2s-pcb.jpg

and on the photo of DAC boards you can see the two 3,3V inputs (one for Xmos, second for DAC chip)
http://www.diyinhk.com/shop/250-thi...lume-control-and-spdif-inputxmoses9018k2m.jpg

and you have in your list this dual power supply
4.17uV Ultralow noise DAC power supply regulator 3.3V/5V 1Ax2 - DIYINHK
so you only need to set both to 3,3V and connect it to DAC board
only thing missing in your list are this power cables
XH Cable 25cm AWG22 - DIYINHK
(2x black-orange for 3,3V and 1x yelow-black-blue for +- 12V)
 
tuxx

tuxx

Member
Joined 2014
archphile.org
Thank you very much Misac!

I have added many XH cables in the order I am about to place to use them in this project and have some spares too.

With regards to the transformer, I saw a link in the beginning of this thread for an rcore from eBay. I am about to order toroids from a local manufacturer here in Greece and your advice is highly appreciated.

I was told that I need 2 transformers. One 2x15 or 2x18 and one 2x9. Is it correct?

Sent from my Oneplus One
 
S

syklab

Member
Joined 2009
glt said:
Just a word in case you feel like adding an external controller such as an Arduino later.

The bundled Xmos usb interface controls the digital volume in the DAC through the I2C bus (it uses the s/w volume control in your computer). If you wish to use an external controller for volume contro (such as using an Arduino), then you will have to purchase an Xmos interface that does not use the I2C bus such as this:
XMOS DSD DXD 384kHz high-quality USB to I2S/DSD PCB - DIYINHK
Click to expand...

Hi GLT,
Are you able to access the DIYINHK web site lately? I have been having problem accessing it from HK for more than a month. All I got is this message
"You cannot access this store from your country. We apologize for the inconvenience.".
 
M

miero

Member
Joined 2011
Are there some measurements of this DAC?

I can provide mine which are not very representative... although they could say something about this DAC.

I have neither DIYINHK XMOS module nor DIYINHK power supplies, but I've used BBB as I2S source and some shunt regulated power supply for 3.3V.

I've used parts provided in the DAC kit, the opamp is NE5532 type.

http://i.imgur.com/XlELWbd.png

The dBV axis is calibrated. For some measurements the auxiliary amplifier with +40dB gain has been used. The sound card used for measurements shows also aliases of frequencies in MHz range.
 
M

miero

Member
Joined 2011
Here is a whole set of my measurements of this DAC.

DIYINHK ES9018K2M DAC measurements - Imgur

Three different opams were used: NE5532, LM4562 and OPA627

Summary of measured distortions:
- THD is bellow 0.004% (i.e. 88dB under the signal)
- THD+N is bellow 0.008% (i.e. 82dB under the signal)

(measurement setup)

Power supply for +/-12V opamp uses Capacitance Multiplier. The 3.3V supplies for DAC were two Trident V1.1 from TPA powered by 7805 regulator.

Source of I2S was BeagleBone Black with onboard clock. Sampling frequency of the test signal was 48kHz.

Recorded on ESI Juli@ sound card at 48kHz sampling frequency. For low signal measurements the signal was amplified by auxiliary +40dB gain amplifier that uses AD797 opamp.
 
H

hedgehog37

Member
Joined 2014
Hallo,
I also dared to build a RasPI + XMOS + DAC combination, without much luck though:confused:

First of all, thank you very much for the instructions in the former posts. So far I figured out how the parts are connected together.

  • I’ve bought a DIYINHK XMOS USB DSD DXD 384k and a sellarzaudio DAC-24192-ULN,

  • connected both via I2S and fed this combo to RasPi via USB. Hope this was right.

  • fed the DAC with 12 V and

  • I assumed that XMOS will be fed via USB but nothing happens when I power everything on.
Do you think I still have to feed XMOS with 3.3V?


Thank you for your support
 

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tuxx

tuxx

Member
Joined 2014
archphile.org
After a major problem I am a happy owner of this dac:

An externally hosted image should be here but it was not working when we last tested it.


After the first 15-20 days of using this dac, the dac board died. DIYINHK acted immediately and replaced the board without any charge so now I am using the second version of my assembly.

I have changed the opamp and now I am using OPA2134. I can't say that the difference from the stock opamp is big but it's definately better to my ears.

The last step now is to put it on a nice enclosure I ordered from Italy.

I have not tested many dacs but this one was a major improvement comparing to my beloved weiliang AK4399 (however it's still one of my favourites).
 
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