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Old 8th August 2009, 02:44 PM   #41
Bunpei is offline Bunpei  Japan
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Join Date: Aug 2008
Quote:
Originally posted by jkeny
Wolfson should be kicked hard for this - putting the chips on the board & charging you for them & then not allowing you to use them - crazy!!
I have understood your claim well.
Along your context, TI should be kicked because their evaluation board product for TAS5706 Class-D Amplifier chip
http://focus.tij.co.jp/jp/general/do...Number=slou220
does not implement USB audio streaming functionality neither in spite of their use of TAS1020B for I2C control to TAS5706 chip.

Quote:
Originally posted by prinzinio
Ofcourse it plays nice in overall meaning, but HIGH frequency is extremelly harsh for me, I cant listen to it for a long period of time.

Guys, do i have to change all four opamps on the pcb if I want to have only unbalanced (RCA) stereo playback?

@jkeny
primary reason why I bought this board was that i thought i will be able to send audio from my pc via USB. I was sooooo disapointed afterwords..
Your comment on the sound makes sense to me. Do you have the same impression even if you attenuate WM8741 output via USB control and compensate it with your HPA? I'm afraid that output gain setting of OPamp system on the board is somewhat high.
Do you employ a good power supply for +-12V?
(In my case "No". I'm not sure that a good power supply can improve quality of the analog sound or not.)

Anyway, you can pass the whole OPA227s and connect your own analog systems to the raw analog voltage output tap of the evaluation board. I have tried connecting my balance-input accepting headphone amplifier to the H2A and H4A points on the board. This means no LPF at all. The result is really "awful". Very harsh and crude treble! I think you need certain LPF circuits of balanced manner. One possible way is to install "line transformer" as LINN KLIMAX DS does.

To tell the truth, I had also expected the USB Audio functionality before I received the actual product. However, as it was not my primary purpose, I disappointed not so much.

Bunpei
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Old 8th August 2009, 05:05 PM   #42
jkeny is offline jkeny  Ireland
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Join Date: Feb 2007
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Quote:
Originally posted by Bunpei

I have understood your claim well.
Along your context, TI should be kicked because their evaluation board product for TAS5706 Class-D Amplifier chip
http://focus.tij.co.jp/jp/general/do...Number=slou220
does not implement USB audio streaming functionality neither in spite of their use of TAS1020B for I2C control to TAS5706 chip.

To tell the truth, I had also expected the USB Audio functionality before I received the actual product. However, as it was not my primary purpose, I disappointed not so much.
I didn't know about the TAS5706 board until you pointed this out - absolutely no excuse for TI - TAS1020B is their USB controller!! I see that they have put a disclaimer in large letters (outlined in orange box) on the the USB & SPDIF schematic sheets in the PDF "Engineering Evaluation Only". So that is how they avoid the issue but a large kicking is deserved.

Quote:
Originally posted by prinzinio

primary reason why I bought this board was that i thought i will be able to send audio from my pc via USB. I was sooooo disapointed afterwords
..I would return all such eval boards & demand a full refund. I imagine it could be argued under the legal consumer protection right "not fit for the purpose"? Unless it was clearly stated beforehand that USB was not operational!

This exposes the mistake people often make that the eval boards from the manufacturer are the best implementation of that chip! (I'm thinking of stuffed boards for sale here that are just copies of eval boards)
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Old 8th August 2009, 05:06 PM   #43
Bunpei is offline Bunpei  Japan
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Join Date: Aug 2008
Quote:
Originally posted by Bunpei
Chiaki is planning to design and release a new PCB board kit with necessary components. Please let us know your opinions.
bunpei<at>ta2<dot>so-net<dot>ne<dot>jp
(The improved version may have a simple LCD display.)
Chiaki completed his PCB design of "SDTrans192" and sent an order to a manufacturer. We will produce 10 sets this time and hopefully distribute 6 or 7 sets internationally.
Detailed information will be posted as soon as Chiaki test the PCB version and his release OK decision is asserted.

The board contains,
1. SDHC/SD memory card reader
2. MPU: Microchip MCP130T-300I/TT (100MIPS 8051 architecture)
3. TCXO: Fox Electronics FXO-HC735-22.5792,24.5760 (stablitiy to +- 20ppm)
4. I2S signal generator: Altera EP3C16E144C8N(FPGA)
5. S/PDIF Interface : Cirrus Logic CS8406 (192kHz Digital Audio Interface Transmitter)
6. S/PDIF Pulse Transformer: Newava Technology S22083
7. LCD: 16-char, x 2-line for human interface
8. LED: 7 LEDs including an indicator for "I2S output buffer empty"
9. Buttons: 4 buttons (Mode, FWD, PLAY, REW )
10. Power Supply Unit: 5V 2A switching power supply ( 100-240V AC input)

The transport can play
1. WAV format file ( no FLAC, MP3) of
2. 44.1, 48, 88.2, 96, 176.4, 192kHz sampling rates
3. 16, 24 bit data length
stored on
1. SDHC (maximum data size limit 32GB)
2. SD ( MiniSD, MicroSD compatible if proper adapters are used)
formatted as
1. FAT16
2. FAT32
and output
1. I2S audio signals
2. S/PDIF signal via 75 ohm BNC connector (no RCA, TOSLINK)

If you have any questions, please contact to Bunpei via e-mail
bunpei<at>ta2<dot>so-net<dot>ne<dot>jp

Bunpei
Attached Images
File Type: jpg sdtrans192.jpg (94.9 KB, 1563 views)
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Old 8th August 2009, 05:16 PM   #44
jkeny is offline jkeny  Ireland
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Sorry Bunpei,
Didn't mean to hijack your thread!

You managed to get 24bit/192KHz working concurrently with reading FAt32 from SDHC & output to LCD screen? No hiccups?

Are you selling a kit or the bare boards? I like your choice of most components but I already have some of these anyway (Tent clock in this speed, LCD screen, power supply). I wouldn't be interested in the S/PDIF parts. Can you give me an idea of pricing?
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Old 8th August 2009, 05:46 PM   #45
Bunpei is offline Bunpei  Japan
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Join Date: Aug 2008
Quote:
Originally posted by jkeny
You managed to get 24bit/192KHz working concurrently with reading FAt32 from SDHC & output to LCD screen? No hiccups?

Are you selling a kit or the bare boards?
Dear jkeny,

As for the first version of prototype, we have no LCD. We just have 3 buttons and two LEDs. In this situation, Chiaki have achieved a necessary data transfer rate for 192kHz 24bit with about 60% cpu load (He invented a good data transfer scheme). I have seldom observed I2S output FIFO buffer empty status.
We prospect that 32bit might be also available if we can test it with 32bit compatible DAC chip.
Hence, even if we add a tiny simple LCD screen to it, we think we can guarantee the necessary transfer rate.

We are planning to sell a kit with all necessary components
(No casing, interface cables and connectors).
Some of important LSIs are to be soldered already on the board.

Bunpei
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Old 26th August 2009, 09:15 PM   #46
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Hey, Bunpei, anymore news on this very interesting project?
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Old 3rd September 2009, 08:29 AM   #47
Tolu is offline Tolu  Germany
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Hi Bunpei

cool project. Admirable skills!

Hardware and concept seems to be a winner design. But everybody has other targets or expectations. So, in a subjective way I would rate

good:
+ SDHC support to 32GB (or greater?)
+ good clock
+ WAV until 24/192
+ I2S interface

not so good/ wishes:
- S/PDIF only via BNC (I prefer TOSLINK or RCA)
- remote control !!!!!!!!!!!!!
- 4x16 LCD with backlight
- gapless playback (a must have!!!)
- good user interface with play time, song title, artist, album
- firmware updates via SD-card

Put me on the list please!
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Old 3rd September 2009, 08:59 AM   #48
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Location: UK
Thomas, BNC is a Mans digital connection, with RCA being a technical/cost based cop out that isn't even a real 75R connection. As for toslink, well that has limitations, but maybe it could be an addon?

Good call on gapless playback though!
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Old 13th September 2009, 02:15 PM   #49
Bunpei is offline Bunpei  Japan
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Quote:
Originally Posted by Woodenhead View Post
Hey, Bunpei, anymore news on this very interesting project?
Quote:
Originally Posted by Tolu View Post
good:
+ SDHC support to 32GB (or greater?)
+ good clock
+ WAV until 24/192
+ I2S interface

not so good/ wishes:
- S/PDIF only via BNC (I prefer TOSLINK or RCA)
- remote control !!!!!!!!!!!!!
- 4x16 LCD with backlight
- gapless playback (a must have!!!)
- good user interface with play time, song title, artist, album
- firmware updates via SD-card
We are very sorry that we have provided no news for a long while on this thread.
We'd like to announce Chiaki's PCB version of SDHC Memory Card Transport, "SDTrans192".
<http://www.chiaki.cc/Transport/images/sdtrans192r20-pcb1.jpg>
Click the image to open in full size.
He designed the PCB by himself and outsourced PCB production. Surprisingly enough, he finished all soldering by hand in spite of the use of numerous surface-mounting parts.
He has just finished two as of now and will expect additional three as a first lot.

He added a LCD that displays a play number and WAV file parameters and
error messages if necessary. A "gapless playback" is not supported.
<http://www.chiaki.cc/Transport/images/sdtrans192r20-ui1.jpg>
Click the image to open in full size.
As a human interface, 4 buttons and 2 LED are employed.

This transport has both I2S and S/PDIF (BNC, 75 ohm) interfaces.
<http://www.chiaki.cc/Transport/images/sdtrans192r20-i2ci2s1.jpg>
Click the image to open in full size.
<http://www.chiaki.cc/Transport/images/sdtrans192r20-spdif1.jpg>
Click the image to open in full size.

Main devices are MPU, SiLabs C8051F361 (25.4 MHz, 100 MIPS) [left in the following picture] and FPGA, Altera CycloneIII [right].
<http://www.chiaki.cc/Transport/images/sdtrans192r20-mcu1.jpg>
Click the image to open in full size.

Chiaki selected such high-precision components as two TCXOs and five voltage regulators.
<http://www.chiaki.cc/Transport/images/sdtrans192r20-pwr1.jpg>
Click the image to open in full size.

If you want to try this "SDTrans192", its price is 350 USD and additional delivery charge. Only payment via PAYPAL will be accepted.
If you do not satisfied with its quality of the transport in an initial one-month trial period, we will provide a refund after your return.

For requesting details in this distribution plan, please contact to Bunpei by e-mail.
bunpei<at>ta2<dot>so-net<dot>ne<dot>jp
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Old 14th October 2009, 02:32 PM   #50
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Location: italy
at last I have this transport in my system running. First impression is very positive but I need more burn in and time for criitical listening .
Here is a picture with the transport connected to a naked dac
Attached Images
File Type: jpg IMG_a5791.jpg (99.0 KB, 495 views)

Last edited by giolight; 14th October 2009 at 02:45 PM.
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