New XMOS usb 384khz - Page 16 - diyAudio
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Old 3rd May 2013, 04:47 AM   #151
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Join Date: Feb 2013
I change resistors on input to iso7640m from 100R thick film to 15R thin film and improve solder. The sharp has gone. It is not the iso make this sound. It is my bad solder and wrong resistor. I use Vishay melf resistor

http://docs-asia.electrocomponents.c...6b80d99de8.pdf

I also move iso power wire direction so it is next to ground wire and not across signal line and iso. It is from LP5900 near the xo. Also add 22uF tantalum on iso power input across X7R.

No more to do. So, now the next toy for playing....
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Old 3rd May 2013, 11:27 AM   #152
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A good thing for this XMOS - the driver is very stable. I cannot get dropout - music plays w/o any error continuously, even the PC is changing LAN etc.

Here is final ( I hope ).

And the next project ... is ... ES9023DAC PCM2706 CS8421 192KHZ 24BIT LM4766 Omron USB DAC Kit WLX | eBay

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File Type: png xmos.png (840.6 KB, 956 views)
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Old 8th May 2013, 09:35 PM   #153
olev is offline olev  Estonia
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Join Date: May 2007
I hacked it in my good old Audio-gd Compass. Removed power from PCM2707 (R27, R28), removed 75ohm i2s resistors (R8-R11) and soldered pins there, removed USB input resistors (R6,R7) and soldered a USB cable there (so I can change the module . R4 was 1MOhm resistor between usb Vcc and GND used for PCM2707 powerup on Compass powerup - used that point for power connection to the internal USB cable. Didn't bother going for the internal +5V line across the PCB, used USB power connected only to the XMOS. XMOS is always on when USB is connected and not only when the whole unit is powered on. Works like a charm! No more 16bit 44.1/48 resampling.
Click the image to open in full size.

Last edited by olev; 8th May 2013 at 09:40 PM.
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Old 10th May 2013, 01:46 PM   #154
RollE2k is offline RollE2k  Sweden
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Try shorting the i2s wires and it will probably be even better :-)
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Old 10th May 2013, 06:45 PM   #155
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Location: Wisconsin
DIYINHK,

I have the board hooked up to your ess9018 board and I am not getting any sound. The lock light is on.

I know the DAC works since I can run it with the CM6631. I uninstalled the CM drivers and restarted the computer. I tried it with the Windows player and JRiver. I get no errors on playback. The drivers say everything is OK. Any idea what I missed?

John
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Old 10th May 2013, 07:57 PM   #156
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Location: Wisconsin
Problem Solved. Sometimes it is too simple. I assumed that the connections where all good since I had a lock light. Not so. I had a cold solder joint on the LRCK line. I hate those darn things. Now it works great. The mute light did not go on with the bad connection when the lock light was on and the player was paused. Now it works right.
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Old 16th May 2013, 10:19 AM   #157
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Anyone do any listen to compare with other device ? I have compared to CM6631. i prefer XMOS. Anyone test against other ? Is XMOS best ?
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Old 25th May 2013, 12:09 PM   #158
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I'm so. Many thanks to every body and diyinhk.
Hope DIYinhk issue the next pcb for more sound quality and DAF(diy's accept factor) .
1) xmos with individual linear regulator( for each +V pins of xmos ,
) and each oscilators , and change the layout for shortest I2S output nearly the xmos or add the buffer/isolator like 74v125 or better.
2) AK 4399 with more srortest output trace ,resistors ,I2s in + add ak4413-15 ob board for take 24/192 via other spdif device.
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Old 26th May 2013, 03:10 AM   #159
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Done, and just compare to my current usibg dac.... ,The SQ is improved from my current dac(te7022L>I2S>AK4395) .

I like this dac set.
but,The XMOS bord not don yet ,still need to do more modify.
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File Type: jpeg xmos.jpeg (47.5 KB, 533 views)
File Type: jpeg xmos1.jpeg (38.2 KB, 526 views)
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Last edited by JustBuildLspkAS; 26th May 2013 at 03:15 AM.
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Old 26th May 2013, 04:52 AM   #160
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Do you use software for controlling the AK4399 ? I want to try in dual mono...
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