Go Back   Home > Forums > Source & Line > Digital Source

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, 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 12th November 2011, 09:06 PM   #1
diyAudio Member
 
Join Date: Aug 2009
Default Building Power Supply for DDE 3.0

I'm interested in building a custom power brick for the Audio Alchemy DDE3.0. I have read that it is dual rail 8v and 18v. It seems like the 8v must be for the decoder and the 18v must be for a high current gain stage. Does this sound correct. And in this case, does it seem rational that the rail quality supplying 8v is much less important than than the 18v rail for the amp. Does voltage stability to the dac chips make any difference?
  Reply With Quote
Old 12th November 2011, 10:12 PM   #2
diyAudio Member
 
Join Date: Oct 2006
The v3.0 actually uses four supply rails, +/-18V and +/-8V duals. The 8V rails are for the digital section, yes, but only marginally less critical to the sound quality as the 18V rails. These supply inputs are regulated inside the dac to the final voltages, so it's not strictly necessary to have regulation in the outboard supply, but I prefer to do so. Although there is no benefit, you can technically feed the dac up to +/-24V on both sets of inputs, limited by the voltage rating of the input filter caps, C101-104. I have the complete schematics of the v3.0. If you send me your email address, I'd be happy to send it to you.

Personally, I find the v3.0 serverely & near irrevocably limited by the use of the PMD100 hdcd chip as digital filter, which collapses the soundstage & sucks the life out of the sound. The lovely AD1862 20bit ladder dacs used in the v3.0 sound FAR better in even a bone stock Pioneer CLD95, or a GIC-filter-deleted Denon DVD2560, which both use non-hdcd digital filter chips. Either of these betters by far even a maximally-upgraded v3.0.
  Reply With Quote
Old 13th November 2011, 02:18 AM   #3
diyAudio Member
 
Join Date: Aug 2009
Given that information, I wonder if the power station 4 that came with these even has separate rails. Now I understand why the monolithic upgrade was a bit expensive.

Is the PMD100 switched out when in 16 bit mode, or is it hopeless in all modes? I have the DDE1.0 and DTI1.0 and I always thought the quality was decent considering the design dates to 1994.
  Reply With Quote
Old 14th November 2011, 01:36 AM   #4
diyAudio Member
 
Join Date: Oct 2006
The problem is that the PMD100 is the digital filter, period. There is no bypass route, and there is no pin for pin non-hdcd replacement. Due to the PMD100 ruining the v3 and the v1.2, the best AA dac, IMO, to upgrade is the dac in the box. A not even fully maxed out ditb utterly mopped the floor with a v3 that I maxed out. It wasn't even close, and the ditb is well down the list of best digital front end upgrade results I've gotten.
The monolithic power supply is not really very good. Just average.
  Reply With Quote
Old 19th November 2011, 08:55 PM   #5
diyAudio Member
 
Join Date: Aug 2009
I was able to find the schematic over on audio asylum. It does not seem to indicate the pinout for the power cable however. Am I missing something?
  Reply With Quote
Old 19th November 2011, 09:16 PM   #6
diyAudio Member
 
Join Date: Oct 2006
In my schematic pdf, it's clearly laid out on page 4, the page with the primary ic voltage regulators.
  Reply With Quote
Old 3rd January 2012, 02:54 PM   #7
diyAudio Member
 
Join Date: Oct 2011
Quote:
Originally Posted by stephensank View Post
I have the complete schematics of the v3.0. If you send me your email address, I'd be happy to send it to you.
I am in the same boat. Sending a PM hoping you wont mind sending me a copy as well.

-Joe
img, #cubbies-overlay{ -moz-transition-property: margin, box-shadow, z-index; -moz-transition-duration: 0.1s; -webkit-transition-property: margin, box-shadow, z-index; -webkit-transition-duration: 0.1s; } .cubbies-selected{ z-index: 9999; box-shadow: 3px 3px 8px -1px blue !important; cursor: pointer !important; margin: -3px 3px 3px -3px; } .cubbies-selected:active{ box-shadow: 2px 2px 5px -1px darkblue !important; margin: -1px 1px 1px -1px; } #cubbies-overlay{ position: fixed; z-index: 9999; bottom: 30px; left: 30px; box-shadow: 0 2px 3px rgba(0,0,0,0.8); border: none; } #cubbies-overlay:hover{ box-shadow: 0 2px 3px rgb(0,0,0); }
  Reply With Quote
Old 4th January 2012, 12:39 AM   #8
diyAudio Member
 
Join Date: Feb 2009
This German outfit has a drop in DF1704 chip module that replaces the PMD100 chip. According to their website, the module can be used in the Audio Alchemy.
ASE-Audiotuning
  Reply With Quote
Old 4th January 2012, 02:33 AM   #9
diyAudio Member
 
Join Date: Oct 2006
Quote:
Originally Posted by ihear21khz View Post
This German outfit has a drop in DF1704 chip module that replaces the PMD100 chip. According to their website, the module can be used in the Audio Alchemy.
ASE-Audiotuning
That is superb info. Thanks for that.
  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
Custom Power Supply for Audio Alchemy DDE 3.0 gto47 Digital Line Level 0 12th November 2011 09:03 PM
I need help building a power supply i am Power Supplies 42 10th May 2011 03:55 PM
Building a bench power supply Bunnfactor Power Supplies 12 11th November 2010 01:03 PM
need help in building 24v power supply milen007 Parts 10 11th September 2008 05:11 AM
Building a power supply unit. S.C Chip Amps 4 6th August 2003 08:59 PM


New To Site? Need Help?

All times are GMT. The time now is 10:48 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