This is awesome. I think it's the first RPi addon with balanced outputs
It takes digital source to a new level together with Volumio or RuneAudio open source.
BerryNOS 1543 – I²S DAC for Raspberry PI
BerryNOS 1543 is an 16-bit stereo audio reference DAC module designed for Raspberry PI model B. I²S based together with Philips D/A converter with a fully balanced design and a unique discrete buffered output stage.
BerryNOS 1543 has S/PDIF input as an extra option, which makes it a DAC module that can be used with
basicly any audio source.
Technical details
Input up to 24bit
Output up to 96 kHz
Output 4.7 Ω balanced
Output 4.7 Ω unbalanced
Frequency 4 Hz – 18 kHz, +0 -0.3dB
THD+N = 0.02% (1 kHz)
Inputs
Raspberry PI input (header P5)
Optional:
S/PDIF input
Outputs
L/R Balanced XLR
L/R Unbalanced RCA
Optional
S/PDIF input
It takes digital source to a new level together with Volumio or RuneAudio open source.
BerryNOS 1543 – I²S DAC for Raspberry PI
BerryNOS 1543 is an 16-bit stereo audio reference DAC module designed for Raspberry PI model B. I²S based together with Philips D/A converter with a fully balanced design and a unique discrete buffered output stage.
BerryNOS 1543 has S/PDIF input as an extra option, which makes it a DAC module that can be used with
basicly any audio source.
Technical details
Input up to 24bit
Output up to 96 kHz
Output 4.7 Ω balanced
Output 4.7 Ω unbalanced
Frequency 4 Hz – 18 kHz, +0 -0.3dB
THD+N = 0.02% (1 kHz)
Inputs
Raspberry PI input (header P5)
Optional:
S/PDIF input
Outputs
L/R Balanced XLR
L/R Unbalanced RCA
Optional
S/PDIF input
Curious design unless I am missing something: It is 24/96 and has balanced outputs, yet it is using a 16/44 DAC chip that doesn't have differential outputs?
/U.
/U.
It has a unique discrete buffered output stage where the phase shifting is done to get balanced output from one TDA1543 chip.
No, it says "Input up to 24 bits". It probably just throws away the lowest 8 bits (without dithering?). Considering it is labelled "NOS", it might well have output well beyond 96 KHz... 🙂
+1.
I have a couple of questions. Firstly how does the output impedance manage to maintain a constant 4.7ohms between balanced and unbalanced outs? A second question - the FR is quoted as being flat (within 0.3dB) out to 18kHz so this means there must be correction for the NOS droop. How's that being done?
I am aware that the raspberry can output ONLY the 48khz family through I2S since it has clock only for that , so how does this DAC implement the 44,1khz family? does it use some kind of downsample algoritm?
This is not so. There are numerous projects using the RPi and I2S running at least upto 24/192k. I believe there is a DPLL clocking mechanism at play. No Masterclock is output, only bit clock, LRCK and data.
Check out the Twisted Pear thread here:
http://www.diyaudio.com/forums/twisted-pear/250583-building-open-embedded-audio-applicance.html
Use something like piCorePlayer or Volumio and you're good to go.
It probably just throws away the last 8 bits. Ive listened to some setups with and without dithering. It affects the sound from non dithering. But I dont find it the correct way to do it eathier. In my case 99% of my music is 16bit/44.1khz so I really dont care about theese specs...
I have this module at home and using it. The sound is amazing. I dont think I would hear any difference between 4.7ohm or 10ohm or maybe even 30ohm. Do you think you would hear the difference?
I dont have any measurements from this dac but Im aware that the signal get distorted early at already 16khz maybe... It not a big secret. But I believe that you as me are fan of NOS dacs and know by fact that they sound amazing even if they dont measure as new dac chips with digital filters. So the specs dont say me much.
I can't see the relevance of your question. My question was about the published specs and whether they make sense, not about any potential impact on how it sounds.
I am indeed a big fan of NOS sound. Just if the specs are inaccurate it (to me at least) doesn't bode too well for the engineering either.
Here is an example off an addon board that can do 192kHz/24bit:
HiFiBerry DAC - high quality 192kHz/24bit audio output for the Raspberry Pi | HiFiBerry
HiFiBerry DAC - high quality 192kHz/24bit audio output for the Raspberry Pi | HiFiBerry
I see your point. I was looking at it from another angle. What I really meant was more or less. Theres other questions to ask and discuss that is more interesten than if the specs are correct or not.
Like..
Why do they choose to balance the signal at the output instead of dual dac chips?
Its an interesting question - I can think of some possible answers. One would be the power consumption is going to be significantly higher by adding a second TDA1543 (50mA typically). Perhaps cost too is an issue.
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