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.
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
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
I did some tests with RaspyFi today. It works like a charm 🙂 I can even play 192/24 FLAC files without any problems 🙂
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.
I did some tests with RaspyFi today. It works like a charm 🙂 I can even play 192/24 FLAC files without any problems 🙂
So, we have a working USB platform then?
Brgds
Nice, very interested in this project, any evaluation boards available prior to launch?
As an aside could you supply the board without phono sockets?
As an aside could you supply the board without phono sockets?
@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.
@Turbon: This is not a USB DAC, it connects directly to the I2S port of the SoC.
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This is a great piece of work! 🙂 Of course the really hard part was getting a working ALSA driver for the Pi's onboard I2S.
There have been a few fixes for the USB issues and RaspyFi incorporates them. If you had trouble running a USB soundcard before, then give it a go, you may be pleasantly surprised.
There have been a few fixes for the USB issues and RaspyFi incorporates them. If you had trouble running a USB soundcard before, then give it a go, you may be pleasantly surprised.
Thanks for the interest. I will inform you, when I have the new version ready.
I did some THD+N measurements today. They look really good. THD+N is <0.004% over the whole audible frequency range. Distortions fall nicely with the order, no high-order distortion peaks:
I did some THD+N measurements today. They look really good. THD+N is <0.004% over the whole audible frequency range. Distortions fall nicely with the order, no high-order distortion peaks:
There are some people interested in this DAC. I want to get a rough idea how many would buy one. If you are seriously interested in buying one, drop me a message with your email. I will then inform you, when the DAC is available.
I got some requests from people who like to use a 3.5mm phone jack instead of the RCA connectors. I will try to incorporate both, then everyone can choose if he want to solder RCA connectors or a phone jack.