A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input) - Page 41 - diyAudio
Go Back   Home > Forums > Source & Line > Digital Line Level

Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 18th June 2013, 08:30 AM   #401
diyAudio Moderator Emeritus
 
Bas Horneman's Avatar
 
Join Date: Apr 2002
Location: The Netherlands
Blog Entries: 18
Quote:
I join the group of the DDDAC builders !!
Welcome to the growing club of builders!!!
  Reply With Quote
Old 18th June 2013, 06:22 PM   #402
diyAudio Member
 
Join Date: Jun 2013
Hi there, I am new on DIYaudio.

I am also building the new DDDAc1794, with eight decks. Stil now two to go, and I have to look for the LM7805. Maybe next week I can finish my project. A lot of 24/192 music to play...!
Regards,
Altjo
  Reply With Quote
Old 18th June 2013, 06:31 PM   #403
diyAudio Member
 
Join Date: Feb 2013
Quote:
Originally Posted by bravi View Post
Hi Supersurfer,

Do you by any chance have spare transformers in your bin to try an experiment? If you have some with a similar voltage to the one you have powering the shunt regs, try paralleling to them so that you have at least 2 or 3 times the VA and see if you hear any difference.

The suggestion is made since a choke input supply designed for critical current flow should not have any difference just by increasing the current rating of the power transformer ( By the way I was running it at only 35% capacity, well below the possible utilisation for a choke loaded supply). But it seems that even though the sec voltage is the same and the rectified voltages are the same, the improvement in sound quality is quite obvious.

Cheers!
Hi Bravi,

I have used a toriodal 300va transformer, with a variac to adjust to the right voltage, just before my transformers arrieved. And, yes there is a difference.
I also have the experience that there is a big difference in sound using other rectifier tubes (in my amps and another dac with tube outputs) or furutech power supply shuko connectors for that matter.

So it is all a matter of combining the right items to create the sound balance you want.
The sound balance of your dac should fit the balance of your complete set, I often need to change some component somewhere else in my setup: when I upgrade a component like the dac, I end up changing the tube settings of my amp to correct the balance.

Regards,
  Reply With Quote
Old 18th June 2013, 08:07 PM   #404
diyAudio Member
 
Join Date: Dec 2005
Location: south
another one who has just bought the kit, looking forward to it arriving. unlike most of you guys i don't know much about the technical stuff but i can solder and have enjoyed making phono stages, headphone amps, power supplies and some speakers.

have any of you experimented with the capacitors?
  Reply With Quote
Old 18th June 2013, 08:17 PM   #405
diyAudio Member
 
Join Date: Feb 2013
Quote:
Originally Posted by spacejay View Post
another one who has just bought the kit, looking forward to it arriving. unlike most of you guys i don't know much about the technical stuff but i can solder and have enjoyed making phono stages, headphone amps, power supplies and some speakers.

have any of you experimented with the capacitors?
Check my post #259
  Reply With Quote
Old 21st June 2013, 07:30 PM   #406
IanS1 is offline IanS1  United Kingdom
diyAudio Member
 
Join Date: Jan 2012
Location: UK
I will be finishing assembly of a single DAC board with Tentlabs regulators this weekend. Looking forward to trying this one out against my 4 DAC board version.

Click the image to open in full size.

Click the image to open in full size.


Click the image to open in full size.

Click the image to open in full size.
  Reply With Quote
Old 21st June 2013, 07:44 PM   #407
diyAudio Moderator Emeritus
 
Bas Horneman's Avatar
 
Join Date: Apr 2002
Location: The Netherlands
Blog Entries: 18
Quote:
I will be finishing assembly of a single DAC board with Tentlabs regulators this weekend. Looking forward to trying this one out against my 4 DAC board version.
That is awesome. Way way better to compare them like that.....rather than first listen...then add shunt regs and listen again.
  Reply With Quote
Old 21st June 2013, 07:52 PM   #408
IanS1 is offline IanS1  United Kingdom
diyAudio Member
 
Join Date: Jan 2012
Location: UK
Quote:
Originally Posted by Bas Horneman View Post
That is awesome. Way way better to compare them like that.....rather than first listen...then add shunt regs and listen again.
We also have a standard single board version so we can do AB tests.
  Reply With Quote
Old 21st June 2013, 08:05 PM   #409
diyAudio Member
 
Join Date: Feb 2013
Hi Ian,

That looks very good! For best performance you need to remove the 47uf capacitors downstream of the regulators: c18, c32 and c27 (left channel example).

If you keep these , the shunt regulators will feed the capacitors and that will slow down (dampen) the regulation.

I am very curious on your findings how this compaires to the standard 4 board set; please keep us posted!

Regards,
  Reply With Quote
Old 21st June 2013, 08:19 PM   #410
IanS1 is offline IanS1  United Kingdom
diyAudio Member
 
Join Date: Jan 2012
Location: UK
Yes Stefan, we will remove the caps once we have got a feel for the sound. Hopefully we will hear improvements once the caps are removed.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
FS: Audio Widget (modified) Async USB DAC 24/192 ESS 9023 headphone friendly ASIO KS 2A3SET Swap Meet 5 15th August 2012 04:52 AM
Show my PCM1794 DAC TSOLINK + COAX + USB input, Line and headphone AMP output AWaudio Vendor's Bazaar 3 2nd January 2012 12:44 PM
GodDAC - 192/24 USB DAC BizonGod Digital Source 36 30th June 2011 03:16 PM
24 bit/192 kHz via USB? gentlevoice Everything Else 3 22nd December 2008 06:24 AM


New To Site? Need Help?

All times are GMT. The time now is 06:38 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2