Where are intern. schematic of LME49710 LME49720 and LM4562 (LM 4562 LME 49710 49720) - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 19th July 2009, 11:14 PM   #1
diyAudio Member
 
tiefbassuebertr's Avatar
 
Join Date: Jul 2005
Location: D-55629 Schwarzerden
Default Where are intern. schematic of LME49710 LME49720 and LM4562 (LM 4562 LME 49710 49720)

Hi,
from many top class operational amps there are schematic diagrams at botton from the datasheets (e. g. AD797, see
http://www.diyaudio.com/forums/attac...amp=1167126984
For the newest LME series from National Semiconductor I don't find schematics by concerning datasheets. I find on other places a wide range of information sources e. g. about
Bob Pease on the New LM4562
National opamp inflation
but also no schematic diagrams of the internal structure. Who is the developer of the LME design?
Perhaps one of you can give me advice about download source of this one.
Thank you very much in advance.

P.S. The main reason for the high sonic quality of AD797 (by the way - also by Mr. Nelson Pass power amps from X-Series, basicly bridged AD797, main difference: MOSFETs and power follower output version) is the single voltage gain stage as differential folded cascode.
Is it the same reason also by the newest LME series`?
  Reply With Quote
Old 20th July 2009, 03:45 AM   #2
Enzo is offline Enzo  United States
diyAudio Member
 
Join Date: Sep 2004
Location: Lansing, Michigan
Why don;t you contact National Semiconductor directly and ask them?
  Reply With Quote
Old 20th July 2009, 03:53 AM   #3
Gopher is offline Gopher  United Kingdom
diyAudio Member
 
Join Date: Nov 2005
Location: UK
There's no schematic because National don't want to tell their competitors how they've done it. Duh!
  Reply With Quote
Old 30th October 2009, 06:00 PM   #4
diyAudio Member
 
tiefbassuebertr's Avatar
 
Join Date: Jul 2005
Location: D-55629 Schwarzerden
Quote:
Originally Posted by Gopher View Post
There's no schematic because National don't want to tell their competitors how they've done it. Duh!
I have read this patent document:
Boliven Patents - US7071781: High speed, high resolution amplifier topology - Reader
And I do not rule out the possibility, that this could be the internal circuit
  Reply With Quote
Old 30th October 2009, 06:21 PM   #5
Electrons are yellow and more is better!
diyAudio Member
 
peranders's Avatar
 
Join Date: Apr 2002
Location: Göteborg, Sweden
Blog Entries: 4
Most schematics are simplified. I'm sure Mr. Scott Wurcer can sign that since he has designed the AD797.
__________________
/Per-Anders (my first name) or P-A as my friends call me
Super Regulator SSR03 Group buy
  Reply With Quote
Old 30th October 2009, 07:30 PM   #6
diyAudio Member
 
nelsonvandal's Avatar
 
Join Date: Nov 2006
Don't you think it's some kind of complementary design, something like LM6171 with extras?
  Reply With Quote
Old 3rd January 2010, 04:49 PM   #7
diyAudio Member
 
tiefbassuebertr's Avatar
 
Join Date: Jul 2005
Location: D-55629 Schwarzerden
also the topology could be basicly the internal circuit:
Attached Files
File Type: pdf Modif. Fold.Casc. NS.pdf (96.0 KB, 370 views)
  Reply With Quote
Old 20th January 2010, 07:07 PM   #8
diyAudio Member
 
Wowozange's Avatar
 
Join Date: Dec 2009
You can go to audiokharma and search the thread "National opamp inflation" where you will meet audioman54. He is the one you are searching for.
  Reply With Quote
Old 21st January 2010, 02:30 PM   #9
diyAudio Member
 
nelsonvandal's Avatar
 
Join Date: Nov 2006
Quote:
Originally Posted by Wowozange View Post
You can go to audiokharma and search the thread "National opamp inflation" where you will meet audioman54. He is the one you are searching for.
He's active here as well, but he doesn't give away any secrets. Not a hint.
  Reply With Quote
Old 22nd January 2010, 09:03 AM   #10
diyAudio Member
 
tiefbassuebertr's Avatar
 
Join Date: Jul 2005
Location: D-55629 Schwarzerden
Quote:
Originally Posted by nelsonvandal View Post
He's active here as well, but he doesn't give away any secrets. Not a hint.
Interesting to know ! Please let me know his diyaudio member name to reading his threads (the "audioman54" here must be an other member than that one from
http://audiokarma.org/

Last edited by tiefbassuebertr; 22nd January 2010 at 09:07 AM.
  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
LME49720 Vs LM4562.... Ryssen Chip Amps 26 12th October 2013 05:48 PM
LME 49720 questions Artie Chip Amps 2 10th April 2009 08:31 PM
Lm 4562 Pocoyo Swap Meet 0 6th January 2008 12:14 AM
Lm 4562 Pocoyo Group Buys 0 14th November 2007 07:27 AM
WANTED TO BUY - LM4562 or LME49720 8Pin DIP arupg Swap Meet 0 9th July 2007 07:57 PM


New To Site? Need Help?

All times are GMT. The time now is 08:00 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