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Old 16th October 2013, 02:28 PM   #1
usul27 is offline usul27  Switzerland
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Default 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.
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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
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Old 16th October 2013, 11:01 PM   #2
kumori is offline kumori  Europe
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Nice one!
I am curious how far this will develop.

Which DAC did you use?
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Old 17th October 2013, 08:09 AM   #3
usul27 is offline usul27  Switzerland
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The DAC chip is a PCM5102. Version 2 will use a PCM5122 which will act as master for all clocks.
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Old 21st October 2013, 11:34 AM   #4
usul27 is offline usul27  Switzerland
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I did some tests with RaspyFi today. It works like a charm :-) I can even play 192/24 FLAC files without any problems :-)
Click the image to open in full size.
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Old 21st October 2013, 12:52 PM   #5
nuryev is offline nuryev  Australia
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Hi,
Are these for sale as kits or assembled?
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Old 21st October 2013, 12:57 PM   #6
usul27 is offline usul27  Switzerland
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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.
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Old 21st October 2013, 01:00 PM   #7
Turbon is offline Turbon  Sweden
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Quote:
Originally Posted by usul27 View Post
I did some tests with RaspyFi today. It works like a charm :-) I can even play 192/24 FLAC files without any problems :-)
Click the image to open in full size.
So, we have a working USB platform then?

Brgds
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Old 21st October 2013, 01:00 PM   #8
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Nice, very interested in this project, any evaluation boards available prior to launch?

As an aside could you supply the board without phono sockets?
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Old 21st October 2013, 01:06 PM   #9
usul27 is offline usul27  Switzerland
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@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.

Last edited by usul27; 21st October 2013 at 01:12 PM.
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Old 21st October 2013, 01:32 PM   #10
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Please put me down for a board.
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