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-   -   My DAC for the Raspberry Pi (https://www.diyaudio.com/forums/digital-line-level/244271-dac-raspberry-pi.html)

usul27 16th October 2013 02:28 PM

My DAC for the Raspberry Pi
 
I started my DAC project for the Raspberry Pi. The first version runs as an I2S slave device and already works very well. On-chip PLL automatically syncs to different clock frequencies. Analog power is supplied by an additional low-noise voltage regulator.
https://i1.wp.com/www.crazy-audio.co...-proto-4-3.jpg
HiFiBerry Mini | Crazy Audio

I will do more measurements next week.

Version 2 is in design phase. It will be a bit more complex:
- onboard oscillator, runs as I2S master
- DAC chip with I2C control (volume control, sample rate, minimal DSP postprocessing)

Regards
Daniel

kumori 16th October 2013 11:01 PM

Nice one!
I am curious how far this will develop.

Which DAC did you use?

usul27 17th October 2013 08:09 AM

The DAC chip is a PCM5102. Version 2 will use a PCM5122 which will act as master for all clocks.

usul27 21st October 2013 11:34 AM

I did some tests with RaspyFi today. It works like a charm :-) I can even play 192/24 FLAC files without any problems :-)
https://i2.wp.com/www.crazy-audio.co...-raspberry.png

nuryev 21st October 2013 12:52 PM

Hi,
Are these for sale as kits or assembled?

usul27 21st October 2013 12:57 PM

Not yet, but in about 2 months. I will also test another DAC/voltage regulator combination and see, what sounds best. Most likely there will be a kit with all SMD components soldered. Some soldering is needed, because the P5 header has to be soldered on the Raspberry.

Turbon 21st October 2013 01:00 PM

Quote:

Originally Posted by usul27 (https://www.diyaudio.com/forums/digital-line-level/244271-dac-raspberry-pi-post3674341.html#post3674341)
I did some tests with RaspyFi today. It works like a charm :-) I can even play 192/24 FLAC files without any problems :-)
https://i2.wp.com/www.crazy-audio.co...-raspberry.png

So, we have a working USB platform then?

Brgds

smallangryboy 21st October 2013 01:00 PM

Nice, very interested in this project, any evaluation boards available prior to launch?

As an aside could you supply the board without phono sockets?

usul27 21st October 2013 01:06 PM

@smallangryboy: There are 2 eval boards of the prototype, these are already reserved for 2 guys. There might be another 2 eval boards of version 2. The phono sockets will be parts of the kist, however, you do not have to solder them on the board.

@Turbon: This is not a USB DAC, it connects directly to the I2S port of the SoC.

smallangryboy 21st October 2013 01:32 PM

Please put me down for a board.


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