Koon,
http://www.diyaudio.com/forums/showthread.php?postid=1886726#post1886726
> I will begin studying read-only, SDHC 32GB only, FAT32, later.
Great news. Very much looking forward to your update.
Patrick
http://www.diyaudio.com/forums/showthread.php?postid=1886726#post1886726
> I will begin studying read-only, SDHC 32GB only, FAT32, later.
Great news. Very much looking forward to your update.
Patrick
Hi Patrick,
I'm waiting 32GB SDHC card from Amazon....
an interval I'm thinking about next board, after FAT32 implementation.
4in x 5in 4 layer (ExpressPCB 4 layer ProtoPro spec)
http://www.expresspcb.com/ExpressPCBHtm/Specs4LayerProtoPro.htm
16x2 display, 3.3V
Lithium Battery 860mAh for portability
USB-miniB for CHARGE ONLY (note)
SD card holder, dsPIC 100pin (30KB memory)
11.288MHz, dedicated regulator, MCLK buffer
I2S output
Toslink SPDIF optical output
pad for COAX SPDIF output
Play/Pause/Stop/FF/PREV CD(folder)FF / Prev keys
Note: There are no USB2.0 - SDHC writer chip on sale at Digikey etc,
so I will not try USB file management at this version.
Just pull SDHC - and use PC's SD slot or SD reader.
I'm waiting 32GB SDHC card from Amazon....
an interval I'm thinking about next board, after FAT32 implementation.
4in x 5in 4 layer (ExpressPCB 4 layer ProtoPro spec)
http://www.expresspcb.com/ExpressPCBHtm/Specs4LayerProtoPro.htm
16x2 display, 3.3V
Lithium Battery 860mAh for portability
USB-miniB for CHARGE ONLY (note)
SD card holder, dsPIC 100pin (30KB memory)
11.288MHz, dedicated regulator, MCLK buffer
I2S output
Toslink SPDIF optical output
pad for COAX SPDIF output
Play/Pause/Stop/FF/PREV CD(folder)FF / Prev keys
Note: There are no USB2.0 - SDHC writer chip on sale at Digikey etc,
so I will not try USB file management at this version.
Just pull SDHC - and use PC's SD slot or SD reader.
Attachments
Koon,
Firstly I am very happy that you are giving this excellent solution a update for SDHC. I was planning to build the original version anyhow, but now I can look forward to a more modern version.
Many of the new features you planned can also be found here :
http://www.qlshifi.com/en/wzcapi/qa550.htm
And they even have remote.
BUT, for audiophile use, small size and portability is less important. Performance is the only criterion.
So here was what I had in mind (for my own implementation and probably own PCB) :
1. Only WAV and SD, only I2S out, nothing else, not even SPDIF.
2. "Remote" (>50mm distance) clock11.2896MHz placed close to the DAC.
3. Push buttons on separate PCB via flat cable (for a full size player).
4. Remote control by parallel shunting the push buttons using optocouplers driven by a separate uP.
5. VFD 2x16 linked to WAV player by flat cable (much better than LCD).
6. Everything has its own regulated power supply powered by separate batteries.
This is of course not for everyone, so in the end I might just end up using your source codes and main circuit architecture.
Looking forward to your further progress,
Patrick
Firstly I am very happy that you are giving this excellent solution a update for SDHC. I was planning to build the original version anyhow, but now I can look forward to a more modern version.
Many of the new features you planned can also be found here :
http://www.qlshifi.com/en/wzcapi/qa550.htm
And they even have remote.
BUT, for audiophile use, small size and portability is less important. Performance is the only criterion.
So here was what I had in mind (for my own implementation and probably own PCB) :
1. Only WAV and SD, only I2S out, nothing else, not even SPDIF.
2. "Remote" (>50mm distance) clock11.2896MHz placed close to the DAC.
3. Push buttons on separate PCB via flat cable (for a full size player).
4. Remote control by parallel shunting the push buttons using optocouplers driven by a separate uP.
5. VFD 2x16 linked to WAV player by flat cable (much better than LCD).
6. Everything has its own regulated power supply powered by separate batteries.
This is of course not for everyone, so in the end I might just end up using your source codes and main circuit architecture.
Looking forward to your further progress,
Patrick
Hi ,
http://www.qlshifi.com/en/wzcapi/qa550.htm
oh it's great! almost what I want is here.
so, you want "can be portable and also full sized ready"?
1. of course you can omit CS8406 SPDIF
2. remote clock like this kit? nice.
http://www.diykits.com.hk/OPA.htm
I added rmt_clk input pad, around clocks.
3.4. remote button pad on the bottom
5. VFD for front display?
16 pads on the top has D0-3, RS, E, R/W signals.
6. If you extend and give dedicated power to LCD, SD, button, clk, and omit these parts on the board.... there will be only PIC and 3.3V regulator for PIC, and some 0.1uF on main board
65/35, 100mil pads can be expanded very easy.
http://www.qlshifi.com/en/wzcapi/qa550.htm
oh it's great! almost what I want is here.
so, you want "can be portable and also full sized ready"?
1. of course you can omit CS8406 SPDIF
2. remote clock like this kit? nice.
http://www.diykits.com.hk/OPA.htm
I added rmt_clk input pad, around clocks.
3.4. remote button pad on the bottom
5. VFD for front display?
16 pads on the top has D0-3, RS, E, R/W signals.
6. If you extend and give dedicated power to LCD, SD, button, clk, and omit these parts on the board.... there will be only PIC and 3.3V regulator for PIC, and some 0.1uF on main board
65/35, 100mil pads can be expanded very easy.
Attachments
> http://www.qlshifi.com/en/wzcapi/qa550.htm
> oh it's great! almost what I want is here.
We bought 2. Will report whether it is any good.
Are planning to put an AK4396 next to it.
> so, you want "can be portable and also full sized ready"?
You want portable, I want fill size.
> http://www.diykits.com.hk/OPA.htm
No. A modifed version of the Hagclock / Kwakclock7.
http://www.hagtech.com/hagclock.html
> I added rmt_clk input pad, around clocks.
> 3.4. remote button pad on the bottom
> 5. VFD for front display?
> 16 pads on the top has D0-3, RS, E, R/W signals.
Great service.
> 6. If you extend and give dedicated power to LCD, SD, button, clk, and omit these parts on the board.... there will be only PIC and 3.3V regulator for PIC, and some 0.1uF on main board
Plus the SD socket, and lots of connectors.
Thx,
Patrick
> oh it's great! almost what I want is here.
We bought 2. Will report whether it is any good.
Are planning to put an AK4396 next to it.
> so, you want "can be portable and also full sized ready"?
You want portable, I want fill size.
> http://www.diykits.com.hk/OPA.htm
No. A modifed version of the Hagclock / Kwakclock7.
http://www.hagtech.com/hagclock.html
> I added rmt_clk input pad, around clocks.
> 3.4. remote button pad on the bottom
> 5. VFD for front display?
> 16 pads on the top has D0-3, RS, E, R/W signals.
Great service.
> 6. If you extend and give dedicated power to LCD, SD, button, clk, and omit these parts on the board.... there will be only PIC and 3.3V regulator for PIC, and some 0.1uF on main board
Plus the SD socket, and lots of connectors.
Thx,
Patrick
yes I want portable, 0.5 inch thin.
>Plus the SD socket, and lots of connectors.
SD is also extendable, you need to place SD slot at front panel.
I'm thinking to use this SD breakout.
http://www.sparkfun.com/commerce/product_info.php?products_id=204
It can be placed on the board or extended to front panel,
Or you can use other SD slot. anyway SD connection is also 65/35 100mil pads.
>Plus the SD socket, and lots of connectors.
SD is also extendable, you need to place SD slot at front panel.
I'm thinking to use this SD breakout.
http://www.sparkfun.com/commerce/product_info.php?products_id=204
It can be placed on the board or extended to front panel,
Or you can use other SD slot. anyway SD connection is also 65/35 100mil pads.
Why not use this :
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=HR845CT-ND
Much cheaper.
Patrick
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=HR845CT-ND
Much cheaper.
Patrick
Hi Tolu
I too am interested to hear what Patrick thinks of the QA-550.
I bought one myself recently. I had it up and running easily and quickly using the maximum size 8GB card.
The display shows track no. and total no. of tracks (max 200) and the first four letters of the track title. With the remote you can select a track by number and you can cycle through the folders (max 16). It would be more convenient if a folder could be selected by number too, though.
As a digital transport my first impressions (using SPDIF) are that it is at least equal to my 'Shigaclone' transport. In the near future I plan to make use of the I2S output that is available on the circuit board.
John
in my opinion, we can't use internal PLL please refer to the dspic datasheet, the jitter of the PLL is 0.5-3.0% !!!!
so the better way is using 2 dsPIC
SD card->dsPIC1(PLL full speed 40MIPS)->[wav data out via SPI or other port]
->SPI WAV data in->dsPIC2(NO PLL,11.2896MHz TCXO only)->DCI/I2S digital out.
i strong recommend you to using two dsPIC33FJ64GP802 (28pin DIP)
only this way can eliminate the PLL jitter in the CPU!
so the better way is using 2 dsPIC
SD card->dsPIC1(PLL full speed 40MIPS)->[wav data out via SPI or other port]
->SPI WAV data in->dsPIC2(NO PLL,11.2896MHz TCXO only)->DCI/I2S digital out.
i strong recommend you to using two dsPIC33FJ64GP802 (28pin DIP)
only this way can eliminate the PLL jitter in the CPU!
I hope the developers increase the capacity to at least 32 GB and no restrictions to number of folders and titles.
A bigger display (2x20 chars) would be great, too.
I want to marry it with 4x TDA1543 D/A over I2S. The DAC with one TDA1543 from the same guys works perfect. I am very pleased with it after some mods. The short fall is the low output level (0.7 Vrms) which is a little less to drive my passive pre. But sound is great!
A bigger display (2x20 chars) would be great, too.
I want to marry it with 4x TDA1543 D/A over I2S. The DAC with one TDA1543 from the same guys works perfect. I am very pleased with it after some mods. The short fall is the low output level (0.7 Vrms) which is a little less to drive my passive pre. But sound is great!
All these extra wishes costs money, and then you will complain the price is too high.
To get exact what you want, there is only one way out -- DIY.
We have tested the QA550 with SPDIF, but that is not the goal. We have not tested I2S yet. Will take a while. Perhaps some of you would have beateb ne to that.
Patrick
To get exact what you want, there is only one way out -- DIY.
We have tested the QA550 with SPDIF, but that is not the goal. We have not tested I2S yet. Will take a while. Perhaps some of you would have beateb ne to that.
Patrick
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