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Old 4th August 2012, 11:38 AM   #511
Bunpei is offline Bunpei  Japan
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Default Possible next release and pricing

To those who are interested in SDTrans384,

Neither Chiaki nor Bunpei has any stock of SDTrans384 now.

Chiaki made his preliminary agreement with a Japanese small audio device vendor, "Tachyon",
Tachyon - SDTrans384 (In Japanese only)
on a possible distribution of SDTrans384.

Tachyon is preparing the next release of SDTrans384. Chiaki will not release it by himself.

However, the company Tchyon has not been starting their actual distribution yet. So their announce is preliminary. No finalized release date is available.
Further more, they have not made any decisions on over-sea sales. (This does not necessarily means they will not handle over-sea distributions.)
I think they may consider over-sea shipping if they get many requests.

According to the web page quoted above, their preliminary pricing is;
1. a bare board (which is equivalent to Chiaki's distribution of the kit)
498,000 JPY (Tax included)
2. a board in Tchyon's original casing
698,000 JPY (Tax included)

Bunpei
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Old 4th August 2012, 12:36 PM   #512
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Bunpei , if those are the prices I don't think they will get many oversea orders, they are really too expensive.
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Old 4th August 2012, 12:46 PM   #513
Bunpei is offline Bunpei  Japan
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Oh, What a mistake! I showed x 10 prices in my previous post!

Its correct pricing is;
1. a bare board (which is equivalent to Chiaki's distribution of the kit)
49,800 JPY (Tax included)
2. a board in Tchyon's original casing
69,800 JPY (Tax included)
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Old 4th August 2012, 01:56 PM   #514
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happy to hear this.
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Old 11th August 2012, 02:28 PM   #515
Bunpei is offline Bunpei  Japan
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Default DSD256 play on TI PCM1795

In addition to plays on ES9018 DAC chip, I tried to connect DSD256 output of SDTrans384 to TI PCM1795 (Dual mono configuration on Onkyo DAC-1000(s)) and got a successful result.
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Old 11th August 2012, 02:48 PM   #516
Bunpei is offline Bunpei  Japan
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Default DSD256 play without DAC chip

Recently in Japan, several digital audiophiles have been probing DSD playing without DAC chips by applying a simple LPF to digital output raw signals of DSD.

I also tried an "easy" LPF (LCR) directly connected to output pins of SDTrans384.
Wow! Clear analog sound of an enough volume level comes through such an easy filtering!

I think it's worth trying for SDTrans384 users those who are interested in DSD play.
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Old 11th August 2012, 08:44 PM   #517
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Fantastic!
Did you compare LPF with ES9018?
Any suggestion for the LPF connection an filtering circuit?
Thanks
Guglielmo
Italy
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Old 12th August 2012, 01:30 PM   #518
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Yes, more details on how this was done Bunpei.
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Old 13th August 2012, 12:36 PM   #519
Bunpei is offline Bunpei  Japan
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Hi, guglielmope & compressit,

Thank you very much for your replies. I will explain the "easy" LPF.
Please remember it is very primitive and not matured. It's just the first trial.

1. You need to add your coupling capacitors to the LPF output
when you have no coupling capacitors in your system.
2. In my case, I adopted a simple LCR type filter.
Some Japanese reported the use of only R, only L, CR, LC, etc. There can be many configurations as you like.
3. I referenced the LCR type filters in the following schematics;
http://www.ti.com/lit/ug/slou220/slou220.pdf (page 36, TI TAS5706B Class D amplifier chip evaluation board)
https://a4956983-a-62cb3a1a-s-sites....attredirects=0 (Koon's DSD Class D amplifier)

4. If you pursue a certain level of quality, you may need to think of such further points;
A. The LPF segment should be isolated from SDTrans because the LPF segment is not of "Digital" but of "Analog".
B. The logic output of DSD signal should be bipolar or differential so as to eliminate the use of coupling caps.
C. The logic output should be drived by a certain analog amplifier.
D. The LPF should be of high order. for example, cascaded multiple LCRs or analog FIR.
E. LPF frequency should be adjusted depending on DSD64, DSD128, DSD256.

When I listened to sounds from the "easy" LPF, I felt that they were of higher resolution than I expected and very vivid or something wild. On the other hand, bass lacks energies and soft.

I think you need your certain efforts for possible improvements.

Bunpei
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Old 13th August 2012, 05:35 PM   #520
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The idea of using a LPF directly from DSD data, with or without post-filter buffer, is an old one, first seen in Vacuumstate SACD Player mods.
Some DIY examples can also be found here :

Out-stage for Sony CD players.


Regards,
Patrick
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