ultimate source

[KOON3876]

Board arrived.

...I hope it will work

[peufeu]

Good luck with your project

http://audio.peufeu.com/

[hifimaker]

Originally posted by peufeu
Good luck with your project

http://audio.peufeu.com/

Peufeu,

You have done a lot of beautiful work in this area and your website is a must read. I've also been following your work over on www.diyhifi.org as well.

When you are done you will have created your own Slimdevices Transporter.

BTW, the Slimserver software is open source and available for PC, Mac, BSD UNIX, Solaris, and Linux. Might be something to take a look at.

http://www.slimdevices.com/pi_features.html

-David

[SunRa]

I am very intersted in this topic and I can hardly wait koon's results!

I know this is a little off topic but I guess this will mean something for digital storage and audio playback!

[KOON3876]

Originally posted by SunRa
I am very intersted in this topic and I can hardly wait koon's results!

Hi don't worry I'm working.
I was waiting ICD2 and dsPIC33 Explorer16 (upper board) arriving.

Explorer16 has SD/MMC board, switches, LCD already.
The only one missing is DCI interface and DMA control.

[tvicol]

Koon,

any update on your project ?

regards, tibi

[KOON3876]

sorry to make you waiting (my business was too busy for these months).

Now it looks like working, I will post files later.
(some kink remains)

Pros: maybe most simple hardware for your DIY DAC, generates direct I2S signal.
Cons: depends on software so much. sensitive real-time operation will make mod difficult. source code is 18 files / 1650 lines.

[KOON3876]

Photos.. (please wait for source. now cleaning.)

Upper image is Oscilloscope.
SD card reading is 2.9ms cycle, and it takes 1.4ms.
Then data copied to DMA memory, transfered into DCI/I2S.
Lower wave is DAC output.

Lower image is boards,
Right: "Ultimate Source" board. SanDisk 2GB SD is used.
Left: Test board, CS4334 and CS8406.
I2S, 44.1kHz,16bit,64bits/Flame, 11.2896MHz master clock is supplied.

Power supply current is 60mA (no DAC/SPDIF) to 100mA (with DAC/SPDIF).

This board works based on 11.2896MHz master clock, so nothing to think about 44.1/48 issues. Hardware is absolutely simple, I can delete nothing. Power consumption is very small, and there are no motors / no AC which creates noize.

Bad: very few sample / knowledges about dsPIC33 on the web. I had to think deep. expensive ICD2 programmer / debugger.
If you love ARM, please use AT91SAM7S256 etc.

improvement:
power supply for Clock, CPU, SD card should be separated to lower the voltage modulation.

[KOON3876]

Current source code, and schematics.
Source code is almost done but maybe some bugs remain.
Now listening CD + test wav file, watching WaveSpectra, no anomaly found.
Sound quality is very nice (with DIY self-satisfaction?).

[Zoran]

Hi Koon,
excelent project indeed...