Current feedback in class A amplifiers - 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 26th September 2001, 11:26 AM   #1
diyAudio Member
 
Join Date: Sep 2001
Location: PARIS
Hi everyone,

I m new in this forum and already have a question for U.

I am interested in everything concerning the current feedback to try that in a home made single ended class A design.

If you have any link/info/schematics about that kind of stuff, it could really be great.

Thanks,
Marc.
PS : I think that it s human, once you ve listened to the Accuphase amplifiers, you tried to get your thing close to it 8))))))) And one secret of the Accuphase sound might be the current feedback.
  Reply With Quote
Old 26th September 2001, 12:18 PM   #2
Geoff is offline Geoff  United Kingdom
diyAudio Member
 
Join Date: Apr 2001
Location: UK
Marco

I am a little confused as to what exactly you want since the Accuphase amps are not single ended. However, I suggest you have a look at my site (use the link button on the bar below). Here you will find the JLH 15W Class-A which is a single-ended current feedback design.

You will also find two Jean Hiraga current feedback amps. The 20W Class-A has a topology very similar to that of the Accuphase (though slightly simpler and without the dc servo).

Another possibility is John Curl's JC-3 (published in Audio Amateur 2/1981). This circuit is also very similar to the Accuphase though it uses an FET input stage instead of bipolar. Unfortunately I cannot remember the URL of the site at which I found the schematic, but a search should reveal it eventually. If not, email me and I will send you the schematic.

From my extensive searches, there are not many current feedback Class-A designs available on the web, though I will admit that I have excluded any with MOSFET output stages due to personal preferences. As you like the Accuphase, you may feel the same way since these amps use a bipolar output stage.

Geoff

  Reply With Quote
Old 26th September 2001, 02:56 PM   #3
tvi is offline tvi  Australia
diyAudio Member
 
tvi's Avatar
 
Join Date: Apr 2001
Location: Moonee Ponds, Vic, Australia
<a href="http://www.diymania.net/pass/project.htm">DIY Audio Projects</a> includes a <a href="http://www.diymania.net/pass/project/CF-Power.htm">Current Feedback Power Amp</a> with lotsa links.


<center><font size="+1" color="#0000a0" face="fantasy">Regards
James</font>
</center>
  Reply With Quote
Old 26th September 2001, 04:19 PM   #4
diyAudio Member
 
Join Date: Feb 2001
Location: Columbia, SC
There is a schematic for the JC-3 that Geoff mentioned at http://www.marklev.com along with a few of the other Mark Levinson designs.

Grey
  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
A different Class A Power Amp - Current Feedback stoc005 Solid State 6 25th February 2011 05:40 AM
Effect of feedback in Class-D amplifiers Workhorse Class D 21 19th August 2005 06:18 PM
'Local Feedback and Nonlinearity of Multistage Feedback Amplifiers' mikeks Solid State 62 20th July 2005 08:03 AM
Novel? current feedback technique for Class D amplifiers Rhesus Class D 4 1st March 2004 07:02 AM
Current Feedback Amplifiers Seminar PGW Parts 0 7th September 2003 08:18 PM


New To Site? Need Help?

All times are GMT. The time now is 08:54 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