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Twisted Pear Superior quality electronic kits

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Old 24th March 2014, 02:51 AM   #401
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Quote:
Originally Posted by asdiasx View Post
Does anybody know if P5-pin1 (+5V) from Rpi can be used to power the teleporter (~150mA current req) without drawbacks on the sound quality/network speed?

The Rpi is being powered by an iphone charger (5V 1A).

Rgds,
Adriano
You should be ok - as long as you don't exceed your power supply's max current.
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Last edited by Russ White; 24th March 2014 at 04:23 PM.
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Old 24th March 2014, 04:18 PM   #402
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BBB is back in stock at Adafruit, as of sometime this morning.
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Old 24th March 2014, 06:11 PM   #403
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Default Isolation on the Cape?

Russ, it would appear to me that for best performance (and because you are bothering to re-clock) that it could be good idea to add isolators (GMRs) on the input side of the cape? This way the onboard clocks will not have their power supply influenced by processing noise, and the outgoing I2S should be as low jitter as the oscillators and their power supplies allow. I prefer synchronous clocking on the ESS 9018 (B-IIIse), but of course for this approach to work really well one needs to have the lowest jitter on the incoming I2S feed as possible.
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Old 25th March 2014, 11:47 AM   #404
signo82 is offline signo82  Italy
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Hi all,
I just read all the posts. It's very interesting.
Now I have Airport express (Li-Ion battery powered) with optical glass cable and audiolab Mdac on my system.
I use also the cd player with coax cable to the dac.

Then I use airport with ipad to listen music from sony unlimited (320kbps aac) or found some days ago, wimp (flac streaming) and it's little better.

Did you try BBB with battery supply instead of common switching power supply? how is sound quality?

Does BBB work fine with airplay and dac connected with usb?
Changing AP with BBB I'd have a digital music player also, but I don't know how the sound quality will be.
Have you any experience on it?

I know you are working hard for i2s, but i'm not still ready to change the dac.
Has BBB got a spdif out? Or it needs i2s-->spdif converter?

Thank you all for the hard work.
I think I'll buy BBB for testing.
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Old 26th March 2014, 12:28 PM   #405
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Russ, if at all possible. Would it make sense to put I2S output connectors on your BBB Cape? As it's intended for high-end audio anyway.
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Old 26th March 2014, 12:31 PM   #406
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Originally Posted by stijn001 View Post
Russ, if at all possible. Would it make sense to put I2S output connectors on your BBB Cape? As it's intended for high-end audio anyway.
That's the basic idea, yes.
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Old 26th March 2014, 01:26 PM   #407
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Originally Posted by Russ White View Post
1) Buffered PCM/DSD out (DSD will take some driver work) The buffer protects the BBB from accidental overloading of the outputs.
2) I2C out
3) Dual ultra low jitter clocks with outputs for DACs which need them.
4) Optional external power.
5) On board linear reg for the clock/mux/buffers.
6) ADC and/or Rotary encoder input to control volume externally.
7) I2C display could also be used.
Cool. I2S is not listed, or is this meant by "PCM/DSD out"? Hence the question.

Last edited by stijn001; 26th March 2014 at 01:29 PM.
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Old 26th March 2014, 01:31 PM   #408
Goto is offline Goto  United Kingdom
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OK, so after a few days listening and fiddling with the BBB, I am about to remove it for the time being from my system.

It sounds good, I have the wifi working, with Squeezelite doing rendering duties, it draws relatively little current and is stable (been up for days without issue).

It also introduces dropouts with the Buffalo 2 (I can see the lock LED flicker each interruption to the music) which are occasional with 44.1/48k streams, but frequent with anything higher rate. It isn't a streaming bandwidth issue as it occurred with a direct Ethernet connection to an LMS server also. I suspect Miero's suggestion of poor clock stability on the BBB is accurate.

I shall wait for the cape before reintroducing the BBB. Meanwhile the RPi, though marginally less detailed and relaxed, will do streaming duties. I have experienced absolutely no dropouts or other issues with the Pi.

Regards
Mark
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Old 26th March 2014, 04:57 PM   #409
TBM is offline TBM  Norway
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Thanks for the update Goto!

Kernel type (IMHO newer realtime kernel is preferable), kernel settings, overall Linux system settings, audio/alsa settings etc will influence the performance as well as getting a rock stable clock that should improve things big time.

My guess is that rpi kernel and system settings are much more optimized due to less "horsepower" compared to the BBB (for now). Once BBB kernel and system settings has matured the same, BBB will be far superior to rpi soundwize.

I have not a BBB yet, but plan to get one, once it is available in stock again.

Cheers
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Old 26th March 2014, 07:36 PM   #410
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Originally Posted by stijn001 View Post
Cool. I2S is not listed, or is this meant by "PCM/DSD out"? Hence the question.
Ah. I2S is a form of PCM. Generally they are used interchangeably, even though doing so is not technically correct.
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