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Old 23rd March 2013, 10:47 AM   #591
Bunpei is offline Bunpei  Japan
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Join Date: Aug 2008
Default Chiaki's SDTrans-Sync-9018D DAC + I/V system

I'd like to introduce Chiaki's combo, SDTrans-Sync-9018D DAC + I/V system

As I briefly reported before, Chiaki prototyped his own ES9018 Dual Mono DAC board designed in a closely-coupled way with SDTrans.
Click the image to open in full size.
http://www.chiaki.cc/Transport/image...ync-tower1.jpg

He added his own I/V module for the DAC recently. I had a chance to listen to them in my environment preparing necessary power supplies.

His DAC board has the following features;
1. ES9018 dual mono configuration for stereo
2. I2S/DSD (LVDS differential) input by way of PS-Audio type HDMI connector & Cable
3. On board Crystek oscillators 45.1584/49.152 MHz
The clock signal is sent back to SDTrans via the HDMI cable
4. Synchronous master clocking scheme for ES9018
5. Complete isolation of interfaces between SDTrans and DAC
SDTrans -> DAC: I2S/DSD, I2C
DAC -> SDTrans: Master clock
6. SDTrans selects a frequency of Crystek oscillator based on a source fs.
Selection command is sent by way of I2C.
7. SDTrans performs adequate register settings for ES9018
8. Muting control from SDTrans side
No click, no pop noises between tracks of any type of sources
9. Five separate power supply input terminals for Clock, Digital-Left, Digital-Right, Analog-Left, Analog-Right sections.
Ground planes are separated in a well-considered manner.
Instead of using on board regulators, an optional external highly-regulated power input can be acceptable.
Attached Images
File Type: jpg 01_Chiaki_DAC.jpg (81.0 KB, 445 views)

Last edited by Bunpei; 23rd March 2013 at 10:51 AM.
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Old 23rd March 2013, 11:03 AM   #592
Bunpei is offline Bunpei  Japan
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Join Date: Aug 2008
His I/V board has the following features;
1. Based-on a standard schematic shown in ESS ES9018 Evaluation Board
Its purpose is shown a kind of reference to users
2. Stackable on his DAC board
3. Unbalanced and balanced output
4. Separated power input terminals for Left and Right (DC +-15V)
5. Muting mechanism controlled from DAC side

The first picture shows the I/V board stacked on the DAC board from a top view. The second shows the DAC and the stacked I/V board from a side view.
Attached Images
File Type: jpg 02_Chiaki_IV.jpg (79.5 KB, 431 views)
File Type: jpg 03_Chiaki_DAC_IV.jpg (86.2 KB, 424 views)

Last edited by Bunpei; 23rd March 2013 at 11:09 AM.
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Old 23rd March 2013, 11:22 AM   #593
Bunpei is offline Bunpei  Japan
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Join Date: Aug 2008
Bunpei's impression for the DAC and I/V board;

1. The system can reproduce very abundant information originally captured in a source when you supply commensurate DC powers with the DAC.
(In other words, the system reflects the quality of power supplies in a very sensitive manner. When we make significant efforts, we will be rewarded enough.)

2. Every SDTrans384 Version 3.0 users has a wonderful opportunity to enjoy a music by obtaining this DAC or DAC + I/V.
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Old 23rd March 2013, 11:43 AM   #594
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wow!!!!!! Are we ready?
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Old 23rd March 2013, 11:55 AM   #595
Bunpei is offline Bunpei  Japan
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Join Date: Aug 2008
Photos of Bunpei's power supplies are shown below for your reference.

(The I/V board in the first picture was Chiaki's first prototype. It is not identical to the second prototype board in shown in the previous post.)
Attached Images
File Type: jpg SDTrans_DAC_Power_01F.jpg (119.5 KB, 416 views)
File Type: jpg SDTrans_DAC_Power_02FG.jpg (123.7 KB, 177 views)
File Type: jpg SDTrans_DAC_Power_03FG.jpg (117.6 KB, 153 views)
File Type: jpg SDTrans_DAC_Power_05F.jpg (92.4 KB, 151 views)
File Type: jpg SDTrans_DAC_Power_06F.jpg (88.1 KB, 151 views)
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Old 23rd March 2013, 02:55 PM   #596
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Join Date: Nov 2004
Location: Udine
Hello compressit,
before I used coax with MCX connector to ES9023.
I've not made comparison tests but I think that U.FL with coax is a good and simple solution.
Ciao
Guglielmo
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Old 25th March 2013, 05:40 AM   #597
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Default Chaiki's sd/dac

That's a crazy setup! I'm sure it is very clean and relaxing to listen to. I added the ti tps7a4700 evm regulator to my sd player. It really helps to hear the music with much more micro detail. I used a tpa lcdps before the ti reg. Sounds better than the tpa placid on its own. Very happy with the sound this sd player creates. Made my system step up big time.
Staccatiss- I think its post 304, pg 31 that has the info on the cap placement. The I2s issue was solved with the other half of the lcdps powering the tpa teleporter, at least so far no issues. Good power supplies make all the difference!
Attached Images
File Type: jpg IMAG0032.jpg (418.4 KB, 177 views)

Last edited by bikerboy; 25th March 2013 at 05:53 AM.
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Old 25th March 2013, 04:26 PM   #598
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I think that was the PPS cap recommendations for ver 2 of SDTRANS. Did you put PPS caps on the same power supplies in version 3?


Quote:
Originally Posted by bikerboy View Post
.
Staccatiss- I think its post 304, pg 31 that has the info on the cap placement. The I2s issue was solved with the other half of the lcdps powering the tpa teleporter, at least so far no issues. Good power supplies make all the difference!
Attached Images
File Type: jpg SN3G0044.JPG (45.7 KB, 146 views)
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Old 25th March 2013, 04:50 PM   #599
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Hi Bunpei,

Sorry for jump in. I'm a new comer. Is SDTrans384 still available for sale?
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Old 25th March 2013, 07:36 PM   #600
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Default PPs caps

Staccatiss- I ordered the caps from Bunpei due to post #299 and #300. If I am wrong I hope Bunpei will let me know. It does sound better.
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