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Old 4th April 2014, 10:06 AM   #471
druidaudio is offline druidaudio  Wales
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Building an open embedded audio applicance.
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!
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Old 4th April 2014, 12:00 PM   #472
linuxfan is offline linuxfan  Australia
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Quote:
Originally Posted by druidaudio View Post
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.

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Originally Posted by druidaudio View Post
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
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Old 4th April 2014, 01:59 PM   #473
Nikitas is offline Nikitas  United Kingdom
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Originally Posted by druidaudio View Post
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.
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Last edited by Nikitas; 4th April 2014 at 02:05 PM.
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Old 4th April 2014, 02:03 PM   #474
Nikitas is offline Nikitas  United Kingdom
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Originally Posted by stijn001 View Post
I'm curious about what you have in mind..
I will upload pcb and 3d file later today.
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Old 4th April 2014, 02:04 PM   #475
Russ White is offline Russ White  United States
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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.
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Old 4th April 2014, 02:08 PM   #476
hochopeper is offline hochopeper  Australia
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Originally Posted by linuxfan View Post
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
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Originally Posted by PET-240 View Post
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
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Old 4th April 2014, 02:12 PM   #477
Russ White is offline Russ White  United States
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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.
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Old 4th April 2014, 07:18 PM   #478
clsidxxl is offline clsidxxl  France
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Russ, Have you an idea of the clocks you want to put on the cape.
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Old 4th April 2014, 08:54 PM   #479
miero is offline miero  Czech Republic
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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.
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Old 4th April 2014, 11:30 PM   #480
Nikitas is offline Nikitas  United Kingdom
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Quote:
Originally Posted by Russ White View Post
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...regulator.html
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