TDA 1541A S1 silvercrown @ ebay - Page 3 - 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 18th April 2004, 09:21 PM   #21
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
One channel output stage
Attached Images
File Type: jpg c4.jpg (61.7 KB, 270 views)
  Reply With Quote
Old 18th April 2004, 09:23 PM   #22
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
Close up of one module
Attached Images
File Type: jpg c5.jpg (68.3 KB, 264 views)
  Reply With Quote
Old 18th April 2004, 09:26 PM   #23
grataku is offline grataku  United States
diyAudio Member
 
Join Date: Dec 2000
Location: -
thanks for the explanation,

Peter, that looks like an exceedingly complex I/V stage, you do own a cd7, right? How does it sound?
  Reply With Quote
Old 18th April 2004, 09:31 PM   #24
diyAudio Moderator Emeritus
 
jean-paul's Avatar
 
Join Date: Sep 2002
Location: Germany
Default I'm not Peter but...

Its just an opamp I/V, opamp LPF and opamp output stage. It looks complex because it is built discrete ( HDAM ) and balanced. Compare it to a cdplayer with normal opamps and you'll notice it is almost the same except for the balanced design which doubles everything. In a Denon with balanced outputs there are 3 dual opamps per channel doing the same job ( with more circuitry internally but with much smaller footprint ).

I expected a nicer I/V to be honest.
__________________
It's only audio. Official member of the Norske Brillegeit Gang.
  Reply With Quote
Old 18th April 2004, 09:39 PM   #25
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
No, I don't own this unit, just the service manual.

But I would be definitely interested in building balanced DAC, similar to that, but with much simpler output stage.

I still don't know how to split data into right and left channels.
  Reply With Quote
Old 18th April 2004, 09:47 PM   #26
Bricolo is online now Bricolo  France
diyAudio Member
 
Bricolo's Avatar
 
Join Date: Nov 2002
Location: Grenoble, FR
The Left and Right channels are separated, so it's not vanilla IIS but maybe some sony format.

What I don't understand is how they get one chip to output L+ L- (or R+ R-) , especially with the DAC configured for IIS input

You'll also notice that even here, BCK is connected to SCK. And even more: pin 4 is reffered as SCK, on this player designed for a TDA1541A


Maybe some pre-processing is done in the digital filter, to send some tata when WS=0, and the 2's complement of the same data when WS=1

The FF only seem to be some synchronous reclocking or WS and Data, synchronously to BCK.
  Reply With Quote
Old 18th April 2004, 09:49 PM   #27
diyAudio Moderator Emeritus
 
jean-paul's Avatar
 
Join Date: Sep 2002
Location: Germany
Quote:
The Left and Right channels are separated, so it's not vanilla IIS but maybe some sony format
Exactly, this is not standard I2S. CD 7 does not use a standard digital filter but a specially programmed DSP.
__________________
It's only audio. Official member of the Norske Brillegeit Gang.
  Reply With Quote
Old 18th April 2004, 09:56 PM   #28
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
The DSP
Attached Images
File Type: jpg dsp.jpg (49.4 KB, 209 views)
  Reply With Quote
Old 18th April 2004, 10:00 PM   #29
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
The format out
Attached Images
File Type: jpg cd8.jpg (36.1 KB, 206 views)
  Reply With Quote
Old 18th April 2004, 10:00 PM   #30
Bricolo is online now Bricolo  France
diyAudio Member
 
Bricolo's Avatar
 
Join Date: Nov 2002
Location: Grenoble, FR
Quote:
Originally posted by jean-paul


Exactly, this is not standard I2S. CD 7 does not use a standard digital filter but a specially programmed DSP.

Ok your message confirms that I was thinking.

Instead of a classical IIS signal like this:

<WS=0> left data bits <WS=1> right data bits [DAC outputs analog values] <WS=0> next left input....


we have this:

-left DAC:

<WS=0> left+ data bits <WS=1> left- data bits [DAC outputs analog values] <WS=0> next left+ input....

right DAC:

<WS=0> right+ data bits <WS=1> right- data bits [DAC outputs analog values] <WS=0> next right+ input....





You need a DSP to do this
  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
D1 I/V with TDA 1541A smario Pass Labs 22 23rd August 2006 04:24 PM
Tda 1541a S1 / S2 Peter K Swap Meet 2 20th May 2004 09:09 PM
Are 1541A S2's still available? ericsphillips Digital Source 1 24th February 2004 08:41 PM
TDA 1541a n2?? setmenu Digital Source 0 16th December 2003 04:24 PM
TDA 1541a S1 Praudio Swap Meet 2 5th October 2003 06:23 AM


New To Site? Need Help?

All times are GMT. The time now is 11:35 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