PCM1704 DAC for sale - diyAudio
Go Back   Home > Forums > Commercial Sector > Swap Meet

Swap Meet Sell your stuff here, who knows, some other fanatic might be interested!

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 5th July 2003, 07:14 PM   #1
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
Default PCM1704 DAC for sale

In order to finance my non-oversampling projects, I decided to sell this David Broadhurst design based DAC. It's using CS8420, PDF1704 and parallel PCM1704 DAC chips (four in total, grade K).
Power supply featuring 6 split bobbin transformers, stack in pairs, for digital part (basically every chip and DAC's analog and digital side and the clock are using separate transformers with it's own full wave, soft recovery rectifiers). Digital PS contain 20 Sprague 1,800u Extralytics, which I believe is a best grade from Sprague.
Attached Images
File Type: jpg d1.jpg (58.0 KB, 1227 views)
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote
Old 5th July 2003, 07:19 PM   #2
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
The electrolytics are under PCB with green ERO bypass caps. On the right side there are 2 split bobbin transformers powering analog output stage. Again 6 ERO 2,200u electrolytics are under the PCB containing soft recovery diodes.
Attached Images
File Type: jpg d2.jpg (93.3 KB, 1136 views)
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote
Old 5th July 2003, 07:22 PM   #3
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
I'm also using Elma 24 switched volume control with total imp of 500ohm, featuring Holco resistors (smaller values are regular metal film as Holcos were hard to get) shunting to ground and Vishay S102 series element.
Attached Images
File Type: jpg d3.jpg (78.9 KB, 1040 views)
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote
Old 5th July 2003, 07:25 PM   #4
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
Here's a rear view of the chassis. There is a provision for switching between 2 sources, yet I didn't install it as I didn't want to compromise the sound quality
Attached Images
File Type: jpg d5.jpg (85.6 KB, 1013 views)
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote
Old 5th July 2003, 07:29 PM   #5
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
There are four PCM1704 DACs (2 per channel in parallel). They are treated as one as they are piggy backed on ea other with separate bypasses. Ea. channel's DAC analog and digital supply have separate reg. for a total of 8 LT (1085 and 1033) regulators. They are installed under the main PCB. As you notice I'm using Vishay resistors for I/V conversion, most of the resistors are Holcos with some Dales RN60, some MIT bypasses and MIT RTX input coupling caps (despite big size they sounded the best).
All bypass electrolytics are either Panasonic HFQ, Black Gates or Nichicon Gold.

I also did triple bypassing on all chips and the info is posted here:
The mods never end, adding Goudreau's triplets
Attached Images
File Type: jpg d6.jpg (73.4 KB, 1023 views)
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote
Old 5th July 2003, 07:40 PM   #6
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
What really suprises me about this project is that although I spent a lot of money and time trying to improve and tweak it, a simple non-oversampling DAC, with carefull attention to PS filtering and reclocking implemented, sounds better than the above posted effort using oversampling approach.

I still believe that this DAC could be further improved, by using different receiver and digital filter, or modifying existing setup and also improving the output stage, but for me it just doesn't appeal anymore.

My recent projects with non-oversampling designs show that this is actually more natural sounding approach and this is what I will pursue currently. I know there are many people who dismiss the non oversampling designs and maybe this DAC would be of interest to them. I'm not posting price and I'm open to offers.
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote
Old 5th July 2003, 07:40 PM   #7
diyAudio Member
 
Join Date: Nov 2002
Location: somewhere
HOW much ....... seems the price will be equal to my anual salary...
  Reply With Quote
Old 5th July 2003, 07:41 PM   #8
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
Quote:
Originally posted by takashi
HOW much ....... seems the price will be equal to my anual salary...

It depends where you live
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote
Old 5th July 2003, 07:50 PM   #9
diyAudio Member
 
Join Date: Jul 2002
Location: denmark
very nice pics - thanks.
i have some $$$ to spent....

later,
troels
  Reply With Quote
Old 6th July 2003, 02:24 AM   #10
diyAudio Member
 
Join Date: Dec 2001
Location: Australia
Send a message via MSN to bacworth
Might be interested can you email me a price and an answer to the following question:

Can it be run on 240v?

thanks,
Brent
acworth@cit.gu.edu.au
  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
DAC Sale, PCM63 K, PCM1704 sivalleydiyer Swap Meet 12 18th October 2011 03:53 AM
non OS pcm1704 hugobors Digital Source 12 1st March 2006 10:07 PM
For sale: DAC based on PCM1704 jezper Swap Meet 0 16th March 2005 03:40 PM
Where to buy PCM1704? m_buzzi Digital Source 3 11th November 2004 01:53 PM
Pcm1704 hacknet Digital Source 5 11th April 2004 10:25 PM


New To Site? Need Help?

All times are GMT. The time now is 03:38 PM.


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