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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 8th December 2014, 07:45 PM   #3591
stijn001 is offline stijn001  Netherlands
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Quote:
Originally Posted by Chanh View Post
...
Great effort, I like the way you cut the little uf.l. adapter board at the DDDAC's end. I might copy that.

Curious to see what box design you'll come up with, a shame to obscure it's impressiveness.
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Old 8th December 2014, 10:14 PM   #3592
boldname is offline boldname
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Quote:
Originally Posted by juancho View Post
I tried the Cinemags with two decks and was a bit underwhelmed compared to two boards direct or via a cap but I am keen to give it another go with a JFET buffer as I loved the sound with the valve output stage.

Thanks for the tips. I have checked and double checked all the obvious tho. I am already on my second board and the main board was swapped for the later one with the clock mods, so it's a bit of a mystery!
Sleep on it.

It seems the best line transformers are required. At least the Cinemag showed it was not a win win. I nearly bought some to try. Thanks

The LL1684 may be one of the better ones, and is used by many. It seems however, as many take them off, as put them on, but the valve buffer is more universally favoured.

The core of the transformer should ideally take some DC without saturating. So without introducing a dc zeroing circuit into the +-i out this is a problem unless you use a big low saturation core transformer. Very expensive.

I guess the Cinemag core may be better suited to v out DAC chips where +- are at same voltage. The transformer should smooth out the treble, but if the treble is really good IMO does not need transformer, only a decent cap. Money otherwise probably better spent on the buffer.
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Old 8th December 2014, 10:29 PM   #3593
dwjames is offline dwjames  United Kingdom
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Cinemag output transformers work very well indeed with the DDDAC with a single dac deck if you use a simple jfet buffer stage inbetween
Click the image to open in full size.Click the image to open in full size.
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Old 9th December 2014, 03:16 AM   #3594
carlsor is offline carlsor  United States
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Join Date: Jan 2008
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Default New Upgraded Single Board PCM1794 DDDAC Postings

I just posted details of my single board DDDAC JFET buffer here: Upgraded Single Board PCM1794 NOS DDDAC

About 2 weeks ago I posted details of the 1/2 clock delay circuit board for the red Main Board here: Upgraded Single Board PCM1794 NOS DDDAC

Last edited by carlsor; 9th December 2014 at 03:22 AM.
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Old 9th December 2014, 04:35 AM   #3595
Chanh is offline Chanh  Australia
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Quote:
Originally Posted by carlsor View Post
Chanh,



Time to take your DDDAC stack apart and install CCS mini-boards. Everyone I know who has replaced the 6K resistor to pin 20 with JFET CCS's feels that the sound quality improved - more detail and dynamics. The total cost of all parts would be much less than for one assembled Acko S03 board.



I have a bare Acko S03 board and plan to buy a BBB computer board and S03 parts. What is the easiest way for me to find out what else I need and the software skills required to make this thing work?
Hi Carlsor,
Many thanks for your kind words!

Frankly, I very am over joyed with my current setup. I fear with JFET CCS might just be too much of a good thing...! Nonetheless, I certainly am craving for more improvement despite the gap is getting narrower as it elevates further up the sonic ladder. Currently, I have no desire for further tweaking because the current SQ is simply too engaging, loving it!!! In the same token, I really look toward to your excellent works for future upgrade if is ok? Please count me in for those 24 boards, I will reserve a set for my mate here, Tuyen! Hopefully we can have some fun in the early 2015?
Will pm you.

With regards to BBB and Acko S03, it is very simple. Please go to Twister Pears Audio and look for support Linux Botic driver from Miero. Alternatively Google the term "Botic driver". When purchase S03, Acko will email you the 12pages pdf manual on how to setup with schematic. Personally I went a step further by using JRiver to manage the 4TB audio library. JRiver does this efficiently better than MPD, which is the embedded player built in Botic driver. JRemote can wirelessly navigates JRiver which is managing the whole library at your fingers, extremely convenience and very user friendly. Those knowing JRemote will appreciate where I am coming from. The trick is to get BBB communicate to your PC with JRiver running. Here you can google "upmpdcli". This piece of code will allows JRiver to control your BBB under the protocol UPnP. Secondly, you need to manually modified the LAN IP address to static on both BBB and PC with JRiver, in order to have them communicate directly for purity of sound. If step 2 is a little too advance, you can simply connect both into a router. JRiver will detect as player namely UpMPD. Which also appears in your JRemote under Zones selection. If selecting UpMPD, it will send all data to BBB which MPD will play the file and I2S direct to DDDAC or S03. Please feel free to shoot me a PM if you are getting stuck? I can also assist the same interface with Raspberry Pi via Volumio 1.4.

Hope Doede doesn't mind for this off topic?!

Cheers.
Chanh
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Old 9th December 2014, 07:01 AM   #3596
nokin is offline nokin  Viet Nam
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I just wonder why only me met problem with hiss noise on output... Dac makes "shhhhhhh" noise when no music (pause,stop,spdif source unconnected...)
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Old 9th December 2014, 12:28 PM   #3597
AudioDAC is offline AudioDAC
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Default RPi or BBB with DDDAC

Hi. Chanh
I am an happy owner of four deck DDDAC
As a source I use modyfied squeezebox receiver with superclock and shunt regulation, and I2S output stright from its Xilinx chip. It has to be really low jitter from Xilinx I2S outpu as the SQ from 44.1 kHz is perfect - much better then from HQ CD PRO source.
As the limitation of the sq. receiver is max to 24B48KkHz, SQ is not so good from HD files >48kHz. (On line transcoding by LMS server)
I am thinkig of changing the reciever to any ather solution as RPi BBB or wandboard, but I heard that RPi(19,2MHz) and BBB(24MHz) aro not strictly audio dedicated and have only one clock resonator.
As an experienced user of DDDAC, could you tell me which solution would be best for this DAC to have source with low jitter for 44.1 and more sampling rates files - to 192kHz or even more if possible.
regards
Andrzej



Quote:
Originally Posted by Chanh View Post
Hi Carlsor,
Many thanks for your kind words!

Frankly, I very am over joyed with my current setup. I fear with JFET CCS might just be too much of a good thing...! Nonetheless, I certainly am craving for more improvement despite the gap is getting narrower as it elevates further up the sonic ladder. Currently, I have no desire for further tweaking because the current SQ is simply too engaging, loving it!!! In the same token, I really look toward to your excellent works for future upgrade if is ok? Please count me in for those 24 boards, I will reserve a set for my mate here, Tuyen! Hopefully we can have some fun in the early 2015?
Will pm you.

With regards to BBB and Acko S03, it is very simple. Please go to Twister Pears Audio and look for support Linux Botic driver from Miero. Alternatively Google the term "Botic driver". When purchase S03, Acko will email you the 12pages pdf manual on how to setup with schematic. Personally I went a step further by using JRiver to manage the 4TB audio library. JRiver does this efficiently better than MPD, which is the embedded player built in Botic driver. JRemote can wirelessly navigates JRiver which is managing the whole library at your fingers, extremely convenience and very user friendly. Those knowing JRemote will appreciate where I am coming from. The trick is to get BBB communicate to your PC with JRiver running. Here you can google "upmpdcli". This piece of code will allows JRiver to control your BBB under the protocol UPnP. Secondly, you need to manually modified the LAN IP address to static on both BBB and PC with JRiver, in order to have them communicate directly for purity of sound. If step 2 is a little too advance, you can simply connect both into a router. JRiver will detect as player namely UpMPD. Which also appears in your JRemote under Zones selection. If selecting UpMPD, it will send all data to BBB which MPD will play the file and I2S direct to DDDAC or S03. Please feel free to shoot me a PM if you are getting stuck? I can also assist the same interface with Raspberry Pi via Volumio 1.4.

Hope Doede doesn't mind for this off topic?!

Cheers.
Chanh
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Old 9th December 2014, 06:39 PM   #3598
Supersurfer is offline Supersurfer  Netherlands
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Join Date: Feb 2013
Quote:
Originally Posted by Chanh View Post
Hi Carlsor,
Many thanks for your kind words!

Frankly, I very am over joyed with my current setup. I fear with JFET CCS might just be too much of a good thing...! Nonetheless, I certainly am craving for more improvement despite the gap is getting narrower as it elevates further up the sonic ladder. Currently, I have no desire for further tweaking because the current SQ is simply too engaging, loving it!!! In the same token, I really look toward to your excellent works for future upgrade if is ok? Please count me in for those 24 boards, I will reserve a set for my mate here, Tuyen! Hopefully we can have some fun in the early 2015?
Will pm you.

With regards to BBB and Acko S03, it is very simple. Please go to Twister Pears Audio and look for support Linux Botic driver from Miero. Alternatively Google the term "Botic driver". When purchase S03, Acko will email you the 12pages pdf manual on how to setup with schematic. Personally I went a step further by using JRiver to manage the 4TB audio library. JRiver does this efficiently better than MPD, which is the embedded player built in Botic driver. JRemote can wirelessly navigates JRiver which is managing the whole library at your fingers, extremely convenience and very user friendly. Those knowing JRemote will appreciate where I am coming from. The trick is to get BBB communicate to your PC with JRiver running. Here you can google "upmpdcli". This piece of code will allows JRiver to control your BBB under the protocol UPnP. Secondly, you need to manually modified the LAN IP address to static on both BBB and PC with JRiver, in order to have them communicate directly for purity of sound. If step 2 is a little too advance, you can simply connect both into a router. JRiver will detect as player namely UpMPD. Which also appears in your JRemote under Zones selection. If selecting UpMPD, it will send all data to BBB which MPD will play the file and I2S direct to DDDAC or S03. Please feel free to shoot me a PM if you are getting stuck? I can also assist the same interface with Raspberry Pi via Volumio 1.4.

Hope Doede doesn't mind for this off topic?!

Cheers.
Chanh
Hi Chanh,

Nice that you got the acko board running. I am still waiting for the potato chips to finish my board

I am wondering why you would make all this extra trouble with jriver through mpd.
I am running volumio and runeaudio (the latter has the edge since the last update for rpi) I control mpd with mpad; this has an excellent GUI and I have no reason to look for alternatives.
I also find that the GUI of runeaudio is more stable and more tuneable than volumio.
Am I missing something here?

Regards,
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Old 10th December 2014, 12:17 AM   #3599
Chanh is offline Chanh  Australia
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Quote:
Originally Posted by Supersurfer View Post
Hi Chanh,
I am wondering why you would make all this extra trouble with jriver through mpd.
I am running volumio and runeaudio (the latter has the edge since the last update for rpi) I control mpd with mpad; this has an excellent GUI and I have no reason to look for alternatives.
I also find that the GUI of runeaudio is more stable and more tuneable than volumio.
Am I missing something here?
Regards,
Hi Stefan,

I have tried them all and including the Picoreplayer, If I must rank them interm of Sound Quality, RuneAudio is the best, follow by Volumio and then Picoreplayer. As for RuneAudio, I found the recent beta 0.3 has too many bugs. The alpha version worked more effortlessly and much stable. WebUI is also the better compare to Volumio. Picoreplayer with LMS sound worst, very muddy and no separation/focus but most importantly lack of clarity. Those are based on personal observations, not saying it will reflect to other setup as audio is very subjective with too many variables like system's synergy, listener's acceptance/hearing,....

With regards to your question, I assumed you are relating this to the Raspberry Pi only? None of the above player are I2S capable for BeagleBone Black just yet! My setup is purely for BBB, though it is also benificial with the Pi if your library is extensively large like 2TerraBytes and up. The Pi is a little sluggish when loaded up with such large audio library. The issue with either MPaD or MPoD is the cover art for each album, catalogue and also when is playing, is it will not display the album artwork. You must also consistently remand the artwork for each album to either "cover.jpg or Folder.jpg". Often that is also not working proper. Not to mention the slow respond when larger library loaded. Playing 24bit 192khz can sometime be stuggtering too...., I can talk about this all day long.....

With regards to my setup, the idea derived from JPlay dual PC setup which I have had appreciation for them before experiement with the Pi than BBB. More infor you can do some background reading on their website. Basically, I delicate a pc for a task that it does best to mitigate any untolerate jitters/noise...! Therefore BBB or pi does best when only play the music via MPD player and nothing else. MPD is an excellent embedded player but suck with file or database management, not to mention the sluggish processor in place. My practical experience proved having the usb hhd and Ethernet connecting to the Pi or BBB has negatively influenced the sound while having it simply Ethernet direct to a ControlPC has the positive effects, more micro-dynamic and better nuisance sound were obviously apparent, not to mention the darker black background.

Again, may I stress that the observation is system base with my hearing capability. Why not try it yourself and advise us if your findings are any differ? I spent more than 18months in search, experimenting, spent loaded of funds and efforts for an analog CA setup, a setup I could appreciate close to a proper setup-up of a TurnTable. I think with what I have, is getting close, dam close!

Presently, if one tried BBB with Acko S03 and with my dual pc setup idea derived from Jplay, I can assured you there will be no turning back! I put my reputation (if I have any! ) on the line here but again pending on how revealing a setup is! Note all my setup is powered by decent audio grade linear powersupply like Doede ps and Per-Anders SSR03. Audio grade linear PS is an essential!

Happy Listening!
Chanh
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Old 10th December 2014, 02:59 AM   #3600
Chanh is offline Chanh  Australia
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Quote:
Originally Posted by AudioDAC View Post
Hi. Chanh
I am an happy owner of four deck DDDAC...
Hi Andreaj,

Hope you find some answers to part of your queries in my response to SuperSurfer.

The clock on the Pi isn't all that bad at all. It does better than BBB's built-in crystal. In that I mean Pi plays all sample frequencies from 44.1-192khz, without any irritating digital noises like the BBB for 44.1khz clock family. If you seek for the best then Acko S03 is an luxury item will contribute that attribute. There might be better one out there, which I am not aware? Personally I found the sound from squeezelite or squeezebox a little less refined than MPD. Experimented it and found not worth pursuing further.

Chanh
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