Sony CDP270 or LC7881 DAC schematic - diyAudio
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 30th November 2002, 04:40 AM   #1
diyAudio Member
 
Join Date: Nov 2002
Location: TX USA
Default Sony CDP270 or LC7881 DAC schematic

I''m looking for the DAC and ouput amp schematic for a Sony CDP270. It looks like it uses a LC7881 DAC but I have not found a pin-out for this chip.

Thanks, Bruce
  Reply With Quote
Old 30th November 2002, 08:41 AM   #2
diyAudio Moderator Emeritus
 
jean-paul's Avatar
 
Join Date: Sep 2002
Location: Germany
Hello Bruce,

The LC part is a Sanyo DAC. I have the datasheet somewhere.
The Musical Fidelity X-DAC has the same one. When I find it I will attach it.

Jean-Paul
__________________
It's only audio. Official member of the Norske Brillegeit Gang.
  Reply With Quote
Old 30th November 2002, 07:36 PM   #3
diyAudio Moderator Emeritus
 
jean-paul's Avatar
 
Join Date: Sep 2002
Location: Germany
Sorry Bruce,

I tried to find it in my collection of pdf's. It's not there anymore or it has another name than the chip.
I remember rather poor results from this DAC in comparison to BB products in terms of performance / sound.

Sorry,

Jean-Paul
__________________
It's only audio. Official member of the Norske Brillegeit Gang.
  Reply With Quote
Old 30th November 2002, 10:50 PM   #4
diyAudio Member
 
Join Date: Nov 2002
Location: TX USA
Jean-Paul,

Thanks for looking. I have found numerous links to the LC7881 but not any chip pinouts. At this point I think it's better to put in a better DAC. Of course I'm not sure if this Sony CDP-270 player is worth the upgrade. I have lots of experiance in design and prototype/test but I've never done a DAC upgrade. Seems like a fun project. Do you think this CD player is worth upgrading or should I look for better quality player?

Thanks, Bruce
  Reply With Quote
Old 1st December 2002, 12:02 AM   #5
diyAudio Moderator Emeritus
 
jean-paul's Avatar
 
Join Date: Sep 2002
Location: Germany
I don't know this specific player Bruce. I googled and found out it's a 200 disk changer !
I wouldn't bet my money on the mechanical quality of the mechanism. Till now most changers I've seen were rather poor designed mechanically.
If it functions OK you can upgrade the DAC if you like. If well designed the results of the new DAC will be a lot better than the original LC7881. You can see it as a project you can learn a lot from.
With the experience you get from the surgery the next maybe more exclusive/expensive cdplayer will be easier to do. And it really is fun to do !
__________________
It's only audio. Official member of the Norske Brillegeit Gang.
  Reply With Quote
Old 1st December 2002, 08:51 PM   #6
diyAudio Member
 
Join Date: Nov 2002
Location: TX USA
Question Sony CDP270 DAC upgrade project

Jean-Paul,

The CDP270 I have is clearly a single disk player, although I've seen several links that label it as a 200 disk changer. http://www.allsearch.de/soundcheckhi...s/cdp270_1.jpg

I think replacing DAC is a good way to get experiance before I tackle a top-end upgrade. In it's original design it has 4 times oversampling digital filiter and digital de-emphasis. My next step is chosing a new DAC and peripheral chips. I opened the player and took a look at the PCB. There is a unused square cut-out in the back panel next to the left and right RCAs. There is no connector soldered in the three PCB pads below the cut-out. The signal trace goes from the pads to the CXD1125 DSP chip. Could this be a digital output that's just unused on this model?

I will do some reading of the many excellent posts on this forum regarding upgrade possibilities. Any suggestions on what chips to use? If the unused connector is a digital output would it be better to build and external DAC?

Thanks, Bruce
  Reply With Quote
Old 1st December 2002, 10:06 PM   #7
diyAudio Moderator Emeritus
 
jean-paul's Avatar
 
Join Date: Sep 2002
Location: Germany
Quote:
Could this be a digital output that's just unused on this model?
Hello Bruce, you are probably right. I advise you to buy the service documentation for your model from Sony. I think they are around 10 US $. Then you now what you're doing in the player

An external DAC suffers a lot more from jitter than an internal one.
I would build it in the player, that way you don't have to go SPDIF.

Concerning chips: the BB ( now TI ) PCM1704 and the DF1704 filter are popular around here. Drawback is their SSOP case ( SMD ). Other good but hard to get ones are PCM63 and the filter DF1700 ( old but good ) Since I am contaminated with the non OS virus I am not the best person to advise you on this matter....
__________________
It's only audio. Official member of the Norske Brillegeit Gang.
  Reply With Quote
Old 26th December 2002, 02:03 PM   #8
diyAudio Member
 
Join Date: Dec 2002
Location: Poland
Default Re: Sony CDP270 or LC7881 DAC schematic

LC7881

Regards
Attached Images
File Type: jpg lc7881.jpg (60.3 KB, 1125 views)
  Reply With Quote
Old 15th November 2012, 07:18 PM   #9
diyAudio Member
 
east electronics's Avatar
 
Join Date: Jan 2006
Location: Athens GREECE
seen that this is a very old thread ...excuse my question since i have no idea when it comes to digital ...Question is

Is there any of these chips that will be a drop in replacement for the LC7881 and will upgrade the digital section ?

All the suggestions above require other mods also ?

Thanks for the help
Kind regards
Sakis
__________________
SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
  Reply With Quote
Old 16th November 2012, 02:02 AM   #10
diyAudio Member
 
Join Date: Oct 2006
There is no drop-in replacement for the LC7881 that I have run into, but I can tell you that the LC7881 can be a very, very nice sounding dac chip when given clean, abundant power supply & a minimum of output stage circuitry.
  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
Sony CDP-M25 schematic. Netlist Digital Source 2 23rd March 2011 03:11 AM
Need a schematic for a SONY CDP-711 CD player mauto Digital Source 0 3rd August 2007 02:57 PM
sony cdp-591 schematic?anyone? Rodzilla Digital Source 0 9th September 2004 10:17 PM
Datasheet for Samsung KDA0316LN or Sanyo LC7881 DAC? Circlotron Digital Source 11 9th May 2003 11:54 AM
DAC Upgrade for older Carver CD Player: LC7881-C DAC M_Anker Digital Source 3 12th December 2001 12:45 AM


New To Site? Need Help?

All times are GMT. The time now is 11:03 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