Replacing the DAC chip - 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 8th January 2013, 08:11 PM   #1
srinath is offline srinath  United States
diyAudio Member
 
Join Date: Feb 2010
Default Replacing the DAC chip

Has anyone replaced the dac chip with a hand made circuit or something like say tubes or something along with the circuit for it. I know all about the opamp swap for tube based circuit ... but the dac chip itself has been left as is in that case.
Thanks.
Srinath.
  Reply With Quote
Old 9th January 2013, 11:04 AM   #2
Izuall is offline Izuall  Romania
diyAudio Member
 
Join Date: Aug 2012
That would not work..DACs are fed digital signal and convert it to analog..tubes are mainly analog devices...as for discrete DACs..i dont know if there are any designs that beat the current high performance ICs.
  Reply With Quote
Old 9th January 2013, 01:17 PM   #3
marce is offline marce  United Kingdom
diyAudio Member
 
Join Date: Jun 2007
Location: Blackburn, Lancs
Why one has to ask, it would not work and to model a DAC chip using discretes etc would be huge.
  Reply With Quote
Old 9th January 2013, 02:26 PM   #4
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
he suggested tubes.... I suppose it would be theoretically possible, but it would be terrible.

imagine the size of a dac made with tubes and resistors!!
  Reply With Quote
Old 9th January 2013, 05:02 PM   #5
srinath is offline srinath  United States
diyAudio Member
 
Join Date: Feb 2010
Well thanks for all the responses. I see a people's put dac projects that they run after the CD player - like from the RCA outputs, and isn't that after the signal is turned to analog and the opamps have done their job etc etc ...

Also is it possible to replace the dac in a cd player, with a better one .. .say a tda1541a ...

I am asking this from a practical view point.
I have a rotel CD player with a tda 1541a, but it has a tray that was broken, and I glued back together. I am trying to see if say my sony or my kenwood that I have a dozen 6 cd cartridges for, I could put the dac in that one and have a 1541 in a better chassis.

Anyway thanks for indulgin me, I am learning ... sometimes a bit slow, but the pursuit is always on ...

Cool.
Srinath.
  Reply With Quote
Old 9th January 2013, 06:14 PM   #6
Julf is offline Julf  Europe
diyAudio Member
 
Join Date: Oct 2011
Location: Amsterdam, The Netherlands
Quote:
Originally Posted by qusp View Post
imagine the size of a dac made with tubes and resistors!!
Click the image to open in full size.
  Reply With Quote
Old 9th January 2013, 06:46 PM   #7
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
lol 3phase powered Dac
  Reply With Quote
Old 9th January 2013, 07:02 PM   #8
josha is offline josha  United Kingdom
diyAudio Member
 
Join Date: Apr 2005
Location: Holmfirth, West Yorkshire
Hi Srinath,

The DAC's people use after the CDP are connected to the digital or SPDIF output of the player, not the RCA's. If you have a CDP with a broken /tray transport then the easiest thing to do is to replace that. If you fancy a bit of DIY then you need to be looking at an SPDIF decoder - this will take the digital/spdif output from another player and convert it into a signal that your TDA1541a will accept.

You will need to intercept the signal that your existing CDP was feeding to the TDA1541a and 'replace' it with the signal generated by the SPDIF decoder.

You're essentially turning your broken CDP into a DAC.

This not a trivial undertaking though! My advice would be to replace the broken tray/transport and do plenty or reading on the subject while enjoying your player!

To get you started.....

Digital-to-analog converter - Wikipedia, the free encyclopedia

and a bit more in-depth....

A Fundamental Introduction to the Compact Disc Player

Hope this helps.......

BTW - I for one would love a wall of tubes like that but my wife.......

Last edited by josha; 9th January 2013 at 07:05 PM.
  Reply With Quote
Old 9th January 2013, 07:22 PM   #9
srinath is offline srinath  United States
diyAudio Member
 
Join Date: Feb 2010
I cant easily find a tray to replace that one ... none of them seem to be about the same ... but I can use it as is, its glued but seems to be holding ... and if it fails, I guess I can glue it again.
Worse yet, I looked in my collection for a dead cd player cos I wanted to cannibalise the transformer, and guess what ... they all decided to work.

Cool.
Srinath.
  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
cs8414 & wm8740 dac (one dac chip) sparkle Digital Line Level 28 28th March 2012 02:10 PM
Dac End Boards and 1865 DAC chip boudy Swap Meet 2 30th April 2011 02:23 PM
replacing Dac freakyone Digital Source 1 24th November 2008 11:49 AM
Converting Dac-in-the-box's DAC chip to I/V output Aleksunder Digital Source 0 22nd January 2007 01:44 PM
Replacing Chip soundNERD Chip Amps 3 9th February 2004 09:40 AM


New To Site? Need Help?

All times are GMT. The time now is 02:08 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