Building an open embedded audio applicance.

[nige2000]

I used the pin out on this
BEAGLEBONE BLACK for AUDIO | H i F i D U I N O

 

[stijn001]

I'm making an adm7151 board for use with the BBB+cape...

I'm curious about what you have in mind..

 

[PET240]

Hey Nige,

Thanks for that, the I2S is covered, Im looking for the DSD pins that Volumio is apparently capable of streaming, I assume the same pins as the I2S but what config? Should I just start hunting with a CRO?

Chuz,

Drew.

 

[Supersurfer]

I use a simple but good quality power supply from Tentlabs for powering my raspberry pi and Alix boards. This unit can deliver up to 1,5A and voltage from 2,5v to 13v:
Tube heater supply

 

[linuxfan]

Im looking for the DSD pins that Volumio is apparently capable of streaming, I assume the same pins as the I2S but what config?

I would expect that the DSD pin configuration follows the same convention used by the ES9018 inputs:

PCM LRCK (D1 on Buffalo) = DSD data 1
PCM DATA (D2 on Buffalo) = DSD data 2

 

[Coris]

ADM7151...

http://www.diyaudio.com/forums/power-supplies/254098-king-regulators-adm-7151-a.html#post3879757

 

[stijn001]

I use a simple but good quality power supply from Tentlabs...

In the meantime I've also ordered these (thanks for the suggestion Palmito), which look excellent on paper, one will power my BBB+cape and one for my WaveIO board (my HDD/SSD will get a seperate USB 5Vdc feed).

4.17uV Ultralow noise DAC power supply regulator 3.3V/5V 1Ax2 - DIYINHK

Accoording to the specification the BBB will draw 210-460 mA @ 5V excluding Russ his cape. So hopefully a 1A PSU will do the job.

 

[Coris]

Indeed, TPS7A4700 with its 4,17µV noise level as pre-regulator, and and a ADM7151 as the lowest noise existing regulator device (1µV and PSSR 94dB), can not be better...

 

[druidaudio]

I use one of these to power my Pi or BBB, but it needs some mods to work properly at 5v/1A. Cheap and good quality.
Simulation shows excellent PSRR and can be improved to -130dB with tweaks, scope shows no noise, just pure dc.
Anything is a massive improvement over the standard ac adapter though!

http://www.ebay.co.uk/itm/SR50-Vari...0023&prg=20140127090629&rkt=4&sd=221233153412

 

[PET240]

Have we any series or shunt schematics about that peoples have tried?

Chuz,

Drew.

 

[druidaudio]

Tried posting this once, but it was removed for some reason?

I am strong believer in shunt regulators for potentially noisy things like Pi and BBB so I use this - ebay item 221233153412. Well made and cheap, but needs modifying to work at 5v/1A.

Simulates well and with some tweaks will exceed -130dB PSRR!

Almost anything is better than standard ac wall adapter though!

 

[linuxfan]

I am strong believer in shunt regulators for potentially noisy things like Pi and BBB

Good point.
Upgraded power supplies for the SqueezeBox have been discussed for several years now, and John Swenson made some interesting comments on this subject here -
Are there any cheap options for a Better Touch Power Supply? - Page 2
You will see that his regulator design is "non-exotic", except for the inclusion of an expensive Hammond choke.

so I use this - ebay item 221233153412.

I think that regulator is originally from AnalogMetric -
SR50 Variable Shunt Regulator 5-50V (8A) Kit_Power Supply Kit_Analog Metric - DIY Audio Kit

 

[Nikitas]

Almost anything is better than standard ac wall adapter though!

You can correct performance superbly well with a following TPS or ADM715x reg.
So well that I see no justification for the extra cost and extra space for a transformer+rectifier+shunt regulator combo.

 

[Nikitas]

I'm curious about what you have in mind..

I will upload pcb and 3d file later today.

 

[Russ White]

Interesting discussion folks, but please not in this thread - this thread is not really about power supplies. Thanks!

We are getting a bit off topic.

Lets stay focused.

 

[hochopeper]

I would expect that the DSD pin configuration follows the same convention used by the ES9018 inputs:

PCM LRCK (D1 on Buffalo) = DSD data 1
PCM DATA (D2 on Buffalo) = DSD data 2

Hey Nige,

Thanks for that, the I2S is covered, Im looking for the DSD pins that Volumio is apparently capable of streaming, I assume the same pins as the I2S but what config? Should I just start hunting with a CRO?

Chuz,

Drew.

Is there a DSD driver??


BBB Rev C with more (double) ram looks interesting

 

[Russ White]

hochopeper, most of the ALSA drivers only support DSD via DoP, not direct stream. Miero and I will be working on supporting actual direct stream DSD via the BBB cape. This requires muliplexing output pins with a bus mux. The cape will support output to B3/B3SE etc - and it should work fine with other DACs (wm8741 etc) too if they are designed to support DSD.

 

[clsidxxl]

Russ, Have you an idea of the clocks you want to put on the cape.

 

[miero]

The software side of DSD support for BBB is in development too.

It requires reprogramming of BBB audio device driver to generate DSD stream on its outputs. DSD is close to I2S multichannel, however a bit different so it takes some time to study datasheet and hack the kernel driver.

If I succeed up to 4 DSD channels would be available for playback.

Keep tuned, I hope there will be more news soon.

 

[Nikitas]

Interesting discussion folks, but please not in this thread - this thread is not really about power supplies. Thanks!

We are getting a bit off topic.

Lets stay focused.

I started the discussion because I'm planning to use this reg with the BBB&cape.
I didn't want to threadjack, sorry for this.
In case anybody is interested, I will be posting further developments here:
http://www.diyaudio.com/forums/power-supplies/253876-interested-adm7151-regulator.html