Music Main board for diyer

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castleeric

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Joined 2010
#1
Music Main board for diyer.

I plan build embedded board for single purpose playing back music. May people can have suggest for my project.
The spec as follows
CPU :VIA NanoTM ULV 1.0 GHz 533 MHz 5.0 W @ FlexVID
Chipset: VIA VX800
Audio control IC: VIA Vinyl Envy24MT PCI Audio Controller on broad
Ram: DDR2 SDRAM 4G on broad
Audio clock X 2 :
1ppm TCXO 49.152 MHz (for 48,96,192 KHz)
1ppm TCXO 22.5792 MHz ( for 44.1,88.2,176.4 KHz)

PCI-E: north bridge PCI-E only for Audio control IC on broad
USB X 2
SATA X 2
Ethernet X 1
PS/2 X 1

Power:
Main broad power: DC 12V
FAN power: none, Fanless , CPU & chipset mount on back side of MB, the bottom of case can use as heat sink.
SATA HD power: None on MB, Supply from independence power supply
Audio control IC power: None on MB, Supply from independence power supply
Audio clock 1ppm TCXO power: None on MB, Supply from independence power supply

Output
SPDIF output X 1 (out put transformer Option)
I2S output X 1
VGA X1

Selector
Audio control IC DAC function En & disable
Audio control IC analog power En & disable
Display function En & disable

Disable
Disable Envy24MT ACD and analog input
Disable Envy24MT AC 97; AC link function.
Disable Envy24MT I2C out put.
Disable Envy24MT UART
Disable VX800 audio function

Connector :
power connector on broad ,
SATA connector on broad
VGA connector on broad
On/off connector on broad
LED connector on broad

Driver:
windows driver & Linux driver
 
#3
GloBug said:
subscribed.
Click to expand...
Me too. I would add:
- a wifi module, so that it's easier to control it via phone or link to a NAS;
- a mini storage, something like a CF, where to install a light OS like voyage mpd;
- IMHO there's too much ram, I think that 2 gb would be enough.

How do you think to realize/produce this project?
How much would cost a mainboard like this?
And what is the form factor?

Plus: would be really cool if you add also a suggested powersupply or a schematic to build it.

GREAT IDEA DUDE! 😀
 
#4
acvtre said:
Me too. I would add:
- a wifi module, so that it's easier to control it via phone or link to a NAS;
- a mini storage, something like a CF, where to install a light OS like voyage mpd;
- IMHO there's too much ram, I think that 2 gb would be enough.

How do you think to realize/produce this project?
How much would cost a mainboard like this?
And what is the form factor?

Plus: would be really cool if you add also a suggested powersupply or a schematic to build it.

GREAT IDEA DUDE! 😀
Click to expand...

hi Acvtre thanks for your input.
I think the wifi module make noise easy to audio signal, I try make a pure bit stream MB. So I think connent AP or HUB to make wifi function, Just for in case.

mini storage, Yes,I plan 64MB in BIOS for user.
Cause try to reduce PCI bridge complex, I didnt plan to use CF function. There is small SSD SATA cheap and fast for different OS.
One 24/192 program is almost 4G , After this project I hope can star another driver & program project, at that time upload play list to ram use DMA channel mapping to audio IC. so I think need that.


I got VIA pepole support to make it come turth. I didnt get all the cost. but I hope it will be lower 650 USD, I am not sure for now.

The form factor not decided and will not follow the PC base.

Power supply will make sound different. I do not know what is right way. Hope pepole can try then.

Hope I can make it.
 
#14
Hi Phofman
Thank you very much for your input. I realy need that. I checked the discussion on internet. I will try make vt1724 driver run at 1100: 176.4 KHz (forces to 128x mode only),MT02[3]=1 (128X) and search IC vendor support. If it can not work I prefer simple solution 176.4kHz->88.2kHz.
 
#15
castleeric said:
I will try make vt1724 driver run at 1100: 176.4 KHz (forces to 128x mode only),MT02[3]=1 (128X)
Click to expand...

That is the correct setup, I do not know of any other for 176.4kHz. All the Envy24 cards without the xilinx clock I had in my hands skip every second sample on SPDIF output, outputing "quasi" 88.2kHz stream. The I2S line seemed OK running at 174.6 when I checked with a scope.
 
#18
castleeric said:
VIA Envy24 HT has DAC funtion. I chouse it because it support dual XO(48,44.1 base) input. But I will not use DAC function. There is I2S RJ45 connector on broad.
Click to expand...

If you tend to carry I2S signal to the RJ45 socket, I2S tracks may get longer comparing possible shorter length. If you can offer additional female pin headers for a doughter "dac board" just nearby Envy24 chip, it would be more effective way to do this job.
 

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#19
Thanks for your sugesstion of considering expansion DAC internal box. I will reverse I2S pin socket near by IC output. I should cancel the RJ45 fe-connector, But it not easey to mount on panel, so I prefer let it on broad mount to panel.

terranigma said:
If you tend to carry I2S signal to the RJ45 socket, I2S tracks may get longer comparing possible shorter length. If you can offer additional female pin headers for a doughter "dac board" just nearby Envy24 chip, it would be more effective way to do this job.
Click to expand...
 
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