Very simple class B amplifier - Page 5 - 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 14th August 2011, 06:30 PM   #41
jaycee is offline jaycee  United Kingdom
diyAudio Member
 
Join Date: Apr 2004
Location: Norwich, UK
If you really want an opamp in there, but more voltage swing, try bootstrapping it. See the Audio Analogue Puccini/Donizetti power amp design for a good example
  Reply With Quote
Old 14th August 2011, 08:58 PM   #42
diyAudio Member
 
tiefbassuebertr's Avatar
 
Join Date: Jul 2005
Location: D-55629 Schwarzerden
Quote:
Originally Posted by jaycee View Post
If you really want an opamp in there, but more voltage swing, try bootstrapping it. See the Audio Analogue Puccini/Donizetti power amp design for a good example
Where have you discocer the schematic?
Attached Images
File Type: jpg audioanaloguedonizetti-2_g.jpg (125.8 KB, 450 views)
  Reply With Quote
Old 14th August 2011, 09:04 PM   #43
diyAudio Member
 
Join Date: Apr 2011
Location: Pretoria
Quote:
Originally Posted by jaycee View Post
If you really want an opamp in there, but more voltage swing, try bootstrapping it. See the Audio Analogue Puccini/Donizetti power amp design for a good example
Thanks for the input. A bit of search engine surfing turned up the original article that served as inspiration for the Audio Analogue guys.

Click the image to open in full size.

This document explains the technique in a very detailed way.

http://www.pi.infn.it/~federico/Immagini/bootstrap.pdf

For those too impatient to read the article, here is what they came up with:
Attached Images
File Type: jpeg eb09.jpeg (27.6 KB, 406 views)
File Type: jpeg eb10.jpeg (36.8 KB, 394 views)

Last edited by ingenieus; 14th August 2011 at 09:13 PM.
  Reply With Quote
Old 14th August 2011, 09:22 PM   #44
diyAudio Member
 
Join Date: Apr 2011
Location: Pretoria
Quote:
Originally Posted by tiefbassuebertr View Post
Where have you discocer the schematic?
I have found it.

http://www.pi.infn.it/~federico/PSE.htm
Attached Images
File Type: jpeg eb11.jpeg (103.3 KB, 433 views)
  Reply With Quote
Old 14th August 2011, 09:27 PM   #45
diyAudio Member
 
Nico Ras's Avatar
 
Join Date: Nov 2005
Location: East Coast of South Africa
Quote:
Originally Posted by ingenieus View Post
What is the value of X1?
20K
  Reply With Quote
Old 15th August 2011, 10:30 AM   #46
diyAudio Member
 
Join Date: Apr 2011
Location: Pretoria
Quote:
Originally Posted by Nico Ras View Post
20K
Thanks, now I can run the numbers in LTspice.
  Reply With Quote
Old 15th August 2011, 10:40 AM   #47
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Thanks Ing,
I have seen the "design idea" used in many opamp driven power amps and have seen comment on why it is needed for the higher voltage rails.
That is the first time I have seen an explanation of why the circuit is necessary and a detailed what the circuit does and how to ensure you get out of it what is needed.

Thanks again for searching.

Any chance of posting the missing page?
__________________
regards Andrew T.

Last edited by AndrewT; 15th August 2011 at 10:42 AM.
  Reply With Quote
Old 15th August 2011, 12:46 PM   #48
diyAudio Member
 
Join Date: Apr 2011
Location: Pretoria
Quote:
Originally Posted by AndrewT View Post
Any chance of posting the missing page?
I got it here:

Puccini Integrated Amplifier

The second page is not there.

Amazingly, the article turns up in another spot on the information highway. There are two more pages. You will find the whole article in this PDF:

http://cds.linear.com/docs/LT%20Jour...04N2_Jun94.pdf

Pages 20 to 22.

Last edited by ingenieus; 15th August 2011 at 12:54 PM.
  Reply With Quote
Old 15th August 2011, 01:00 PM   #49
diyAudio Member
 
Join Date: Nov 2007
Location: Dallas
http://cds.linear.com/docs/Application%20Note/an18f.pdf

They show another way to reach +/-120V output
  Reply With Quote
Old 15th August 2011, 03:14 PM   #50
diyAudio Member
 
Join Date: Apr 2011
Location: Pretoria
Quote:
Originally Posted by kenpeter View Post
http://cds.linear.com/docs/Application%20Note/an18f.pdf

They show another way to reach +/-120V output
Thanks.

Here is how they do it. Into a 6K load. Hmmmm, there must be a way to get it to work with 6R.
Attached Images
File Type: jpeg eb12.jpeg (82.5 KB, 328 views)
  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
Class D Vs Class I (Balanced Current Amplifier) rmsaudio Class D 29 26th January 2014 10:25 PM
simple class a amplifier renjiish Solid State 11 26th June 2007 05:09 AM
More simple class A jerluwoo Solid State 7 24th October 2006 04:19 PM
How to build a very simple class D amplifier!!!For a newbie. thomgun_lc Class D 8 11th September 2005 05:13 AM


New To Site? Need Help?

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