"Super-Pair" I/V for TDA1543 - 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 December 2003, 05:37 PM   #1
rbroer is offline rbroer  Netherlands
diyAudio Member
 
rbroer's Avatar
 
Join Date: Mar 2002
Location: Netherlands
Default "Super-Pair" I/V for TDA1543

Here's the latest incarnation of the folded cascode, common base I/V converter.
Just finished it, and it's up and running

The TDA1543 part of this pcb,
with synchronous reclocking of I2S signals,
Tent XO and the digital supplies can be found here,
Less simple I/V for TDA1543

It's basically unaltered, using VHC logic for synchronous reclocking, several 220u/10V Sanyo Oscon's for bypassing, mixed with 805 SMD combo's of 100n & 10n per Pete Goudreau
Again I settled on 1000u/10V Rubycon ZL with 220u/10V Sanyo Oscon for the TDA1543 supply.
Each chip gets its' own very tiny and very low noise REG101-5 regulator, 805 smd 100n+10n for the BYPASS pin.

I left the DC servo out this time, since my amplifier has one of its own already. Peter Daniel reported some negative influence, even though my simulator THD measurements indicate no ill-effect.

The jfet cascode on the 2nd current sink does improve things, again the THD measurement in the simulator tell me it shouldn't make a difference

Implementing the super-pair brought a small improvement, now the simulator promissed a large improvement

Important lesson learned: DO NOT TRUST SIMULATORS, sorry Jocko, needed to find out for myself...

Riv is a mix of Riken (1.5k), Tantalum (10k) and DALE RN65C (40.2k), Civ is a Philips 1.0n KP

Q2N is 2SC2547E
Q2P is 2SA1085E
all other bjt's are BC549C and BC557B

100u/25V and 470u/25V are Rubycon ZL series

Resistors are small Beyslag series MRS16T

I'll probably leave it this way now, don't have may ideas how to improve it.
Tried the CFP, didn't like it (oscillated at first)

Happy DIY,
Attached Images
File Type: gif superpair-iv.gif (9.2 KB, 7003 views)
__________________
Rudolf Broertjes
  Reply With Quote
Old 30th December 2003, 05:41 PM   #2
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
So how much better is it, comparing to a previous version? Mostly, is it worth upgrading?
__________________
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 30th December 2003, 05:48 PM   #3
rbroer is offline rbroer  Netherlands
diyAudio Member
 
rbroer's Avatar
 
Join Date: Mar 2002
Location: Netherlands
Here it is:
Attached Images
File Type: jpg super1.jpg (57.6 KB, 6032 views)
__________________
Rudolf Broertjes
  Reply With Quote
Old 30th December 2003, 06:13 PM   #4
diyAudio Moderator Emeritus
 
jean-paul's Avatar
 
Join Date: Sep 2002
Location: Germany
Hi Rudolf, is D3 a LED ? I don't think it is but what diode do you use there ?
__________________
It's only audio. Official member of the Norske Brillegeit Gang.
  Reply With Quote
Old 30th December 2003, 07:34 PM   #5
Bricolo is offline Bricolo  France
diyAudio Member
 
Bricolo's Avatar
 
Join Date: Nov 2002
Location: Grenoble, FR
What's the difference between a super pair and a CFP?
  Reply With Quote
Old 30th December 2003, 08:32 PM   #6
rbroer is offline rbroer  Netherlands
diyAudio Member
 
rbroer's Avatar
 
Join Date: Mar 2002
Location: Netherlands
Quote:
Originally posted by Peter Daniel
So how much better is it, comparing to a previous version? Mostly, is it worth upgrading?
Currently I like it a lot, doesn't mean zip to you, I know
Bit hard to tell, since only yesterday I re-installed the jfet cascode on the previous I/V board.
Did you install that jfet on your board btw ?
I'll let you know in a couple of days.

Quote:
Originally posted by jean-paul
Hi Rudolf, is D3 a LED ? I don't think it is but what diode do you use there ?
You could use a 4148 diode, but I used a green LED...think like Christmas trees
__________________
Rudolf Broertjes
  Reply With Quote
Old 30th December 2003, 09:01 PM   #7
diyAudio Moderator Emeritus
 
jean-paul's Avatar
 
Join Date: Sep 2002
Location: Germany
Default Why did I ask ?

I only see 4 LED's on the PCB, that's why I ask. In your schematic I see 5 LED's ( 3 green ones and 2 red ones ).

BTW since the servo is omitted maybe it is better to use an output cap + resistor to ground after it ? Could you repeat the adjustment procedure in this thread for those that don't know the Search function ? The Iref resistor for TDA1543 will be 1k2 ?

Did you change your design for TDA5141A like this one as well ?

Many questions but not meant negatively.

Regards,

Jean-Paul

edit: I checked again and I now see that there are 2 LED's D3 in the schematic ...
__________________
It's only audio. Official member of the Norske Brillegeit Gang.
  Reply With Quote
Old 30th December 2003, 09:55 PM   #8
Bricolo is offline Bricolo  France
diyAudio Member
 
Bricolo's Avatar
 
Join Date: Nov 2002
Location: Grenoble, FR
Quote:
Originally posted by Bricolo
What's the difference between a super pair and a CFP?
  Reply With Quote
Old 31st December 2003, 12:38 AM   #9
Pedja is offline Pedja  Serbia
diyAudio Member
 
Join Date: Jun 2002
Location: Belgrade
...
Attached Images
File Type: gif npn.gif (1.4 KB, 5668 views)
  Reply With Quote
Old 31st December 2003, 12:45 AM   #10
Bricolo is offline Bricolo  France
diyAudio Member
 
Bricolo's Avatar
 
Join Date: Nov 2002
Location: Grenoble, FR
Thank you


Where can I learn more about them?
  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
Peavey "Super Festival" VTA-400 - upgrading to 400W? pharaohamps Tubes / Valves 11 22nd March 2009 01:25 PM
"super pair" I/V new 12.7V version mikelm Digital Source 7 19th September 2004 10:42 AM
"Signal Lock" Indicator for CS8412/TDA1543 Nisbeth Digital Source 7 5th January 2004 10:02 PM
Audio Crafters Guild "Super Symmetric Power Supply" raincheck Digital Source 16 22nd April 2002 09:06 AM


New To Site? Need Help?

All times are GMT. The time now is 04:55 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