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A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)
A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)
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Old 6th April 2014, 02:27 PM   #1471
palmito is offline palmito  United States
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A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)
Quote:
Originally Posted by Supersurfer View Post
Also the ground of the Pi will be messy and this is directly coupled with the dac
I would suggest using a small isolator board between the pi and the dac, they are cheap and easy to put together - one NVE715-3E isolator chip ($10) and two smt capacitors ($1 max). You power one side from the 3.3vdc in Doede's m-board and the 3.3vdc out from the rpi p5 header for the other side. If you use the diyinhk board (2 for free + $4 shipping) I'd leave the chokes out, I thought it sounded better without them. Try it, you will be happily surprised. I posted previously that I'm using the Acko S03 now, nice improvement over the plain isolator. I'm now getting it changed to a single 100mhz clock (since it's async with the rpi) and LiFePO4 battery powering the clock (instead of the any of the three built-in options for different regulators). Until the BBB cape is done and allows RCK of the BBB, this I think is the best solution if you are using the rpi.
Quote:
Originally Posted by Supersurfer View Post
I firmly believe that a small embedded computer will outperform all Win and Mac systems. This is due to building an OS system that only needs to perform the task of streaming audio; all unnessecay processes are taken out of the OS.
This is very true. But at least from the linux side, this can be done with *any* version of linux, not just the ARM based boards. However, the ARM boards have the advantage of low heat, small size and low power consumption - which allows you to place them close to the dac board, since I2S doesn't travel very far.
Quote:
Originally Posted by Supersurfer View Post
And even more because the open source software is originated from audio entheusiasts around the world
Not just the audio stuff, but all open source software, if you don't mind a bit of incovenience when setting things up and reading up fill in the missing documentation, open source is for you!

Sorry Doede, end of the OT post.
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Old 6th April 2014, 02:40 PM   #1472
rhlauranna is offline rhlauranna  Germany
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Join Date: Sep 2005
A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)


Cees, James, Stefan and Hans "inspecting" some DDDACs 1794 and 1543...

A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)


James's DDDAC1794 with one deck...

A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)


Stefan with his "monster tuned" DDDAC1794 with four decks..

A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)


...in detail...

A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)


...and the flipside...

A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)


...the output connections (Furutech), said by Stefan to be "the best"...

A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)


...Shunts and Tantalums...

A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)


...shunts on the new mother board...

A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)


...direct out...

A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)


...the raspberry pi...

A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)


Stefan and Hans laying last hands on Stefan's DDDAC1794...

A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)


...and yes, curiously inspecting all the different stuff...

A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)


this is another "secret" of Stefan how to finely tune his sound.... personally I was never that much into cables, but this one really impressed me... Stefan, please don't forget you promised me to send me a pair for testing purposes... many thanks in advance...

Last edited by rhlauranna; 6th April 2014 at 03:10 PM. Reason: addition
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Old 6th April 2014, 02:59 PM   #1473
mr_whocares is offline mr_whocares  Germany
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Quote:
Originally Posted by Supersurfer View Post
Hi,
...
Switching to I2S direct was also a surprise for all, this was in my opinion the best sounding configuration!
...

Stefan
hi stefan,

your report encourage to test the rasPi with the dddac. would you (or somebody else) please share a diagram how rasPi shall be connected correctly to the dddac via direct i2s , and if there is any issues/tips need to be considered (grounding issues, any i2s attenuation, etc.) .
by the way, which OS and stream player have you used on rasPi? if the OS was tuned/modified to be mainly dedicated for audio streaming (without the heavy rest of the OS), could you please share the modifications of the OS , so that even non-linux freaks like me can follow :-) ?

best regards
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Old 6th April 2014, 03:16 PM   #1474
rhlauranna is offline rhlauranna  Germany
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Join Date: Sep 2005
A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)


the power supply section of Stefan's DDDAC1794...

A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)


...Stefan's raspberry pi > wave IO...

A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)


...and yes, the big winner regarding power supply, Bernd's master achievement, weighing more than 20 kilograms

A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)


...Stefan and Klaus discussing details...

A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)


Klaus and Hans feeling well and understanding each other...

A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)


Stefan, James and Cees arranging the next listening step...

A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)


...unfortunately Ian from England was a little late because of ferry problems at Rotterdam, but nevertheless was integrated within seconds, and that was especially fun...

A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)


..Hans streaming music to Klaus's system with Stefan's I-pad, and James feeling very happy with it...

A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)


Stefan and Klaus looking for certain music tracks... without computer no music at all nowadays...

A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)


...James soldering on his DDDAC1794...

A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)


...and yes, concentrated listening from time to time...

A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)


...and when the boys are hungy, they have to eat something...

A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)


A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)


and last not least James and Ian helping me to solder my new power connections for 12 V and 5 Volt within one to my own DDDACs... hey, you both, thanks a million for doing this for me !!!

Last edited by rhlauranna; 6th April 2014 at 03:40 PM.
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Old 6th April 2014, 03:20 PM   #1475
G600 is offline G600  France
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Stop teasing ! Don't you have a look of Bernd's PS ?
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Old 6th April 2014, 03:50 PM   #1476
rhlauranna is offline rhlauranna  Germany
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Quote:
Originally Posted by G600 View Post
Stop teasing ! Don't you have a look of Bernd's PS ?
here you go:

DDDAC 1794-NOS 24-192

No. 205
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Old 6th April 2014, 03:55 PM   #1477
juancho is offline juancho  United Kingdom
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Hi super surfer, what do you mean by 'direct balanced output' exactly? My DDDac distorts if I use it direct balanced output as I presume it doesn't like the two negatives being commoner in my pre
David
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Old 6th April 2014, 03:57 PM   #1478
palmito is offline palmito  United States
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A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)
Quote:
Originally Posted by mr_whocares View Post
diagram how rasPi shall be connected correctly to the dddac via direct i2s
See images attached.
Quote:
Originally Posted by mr_whocares View Post
by the way, which OS and stream player have you used on rasPi? if the OS was tuned/modified to be mainly dedicated for audio streaming
Install volumio or rune audio on the pi and all the tweaks are already done. You *will* have to read up some on using ssh to connect to the pi unless you hook it up to a monitor for the little hand configuration you have to do. Search back on this thread for what you have to edit in volumio. I have not used rune, but I assume is similar to volumio as they were the same developers that forked their efforts.
Attached Images
File Type: png doede_rpi_iic2.png (180.6 KB, 401 views)
File Type: png doede_rpi_iic2_isolator.png (902.4 KB, 436 views)
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Old 6th April 2014, 04:06 PM   #1479
mr_whocares is offline mr_whocares  Germany
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Quote:
Originally Posted by palmito View Post
See images attached.
Install volumio or rune audio on the pi and all the tweaks are already done. You *will* have to read up some on using ssh to connect to the pi unless you hook it up to a monitor for the little hand configuration you have to do. Search back on this thread for what you have to edit in volumio. I have not used rune, but I assume is similar to volumio as they were the same developers that forked their efforts.
thanks a lot!! i will try that ... i already sent you an email!
regards
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Old 6th April 2014, 05:13 PM   #1480
Supersurfer is offline Supersurfer  Netherlands
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Quote:
Originally Posted by mr_whocares View Post
hi stefan,

your report encourage to test the rasPi with the dddac. would you (or somebody else) please share a diagram how rasPi shall be connected correctly to the dddac via direct i2s , and if there is any issues/tips need to be considered (grounding issues, any i2s attenuation, etc.) .
by the way, which OS and stream player have you used on rasPi? if the OS was tuned/modified to be mainly dedicated for audio streaming (without the heavy rest of the OS), could you please share the modifications of the OS , so that even non-linux freaks like me can follow :-) ?

best regards
Check this: P5 header

And this: building-open-embedded-audio-applicance

I am a Linux noob so do not ask difficult questions on low level software issues

First I used a distribution with mpd build by a friend of mine, later on RaspiFi and now Volumio.
Volumio is very easy to install and use, and has I2S output on the Pi and within the coming months probably also for beagle bone black!

@Palmito,
I think I will wait for the BBB with the Cape from Russ. I expect he can make it nicer than I can
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