Another way of making the output section with class A predriver - Page 2 - 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 5th August 2004, 10:04 PM   #11
Konrad is offline Konrad  Norway
diyAudio Member
 
Join Date: Jun 2003
Location: way up north
Is'nt this just a current loaded buffer, maybee also a current loaded VAS stage before this ? The mpsa 13 the current limiting transistor for the active load. Probably its class A. 1,1-1,2v ube. near 12 mA in tr23 There is many ways to achive class A and this is just one of many for many different stages. As such it dont seem to have any (significant) advantage over other commonly used low open loop gain/low lockal feedback in the output stage.
BUT : if the current limiting transistor also has temperature feedback as it will. And the overall dc performance is achieved thru overall feedback, but is most definetly coupled thru temprature. But then it will alter the biaspoint also for the innput stage as temperature alters. If class A is the goal there will still bee 'small' changes. ie sin tone to full output at klass A settup load the temp in the output stage would make a small drop (for most commonly designed class A stages). And again altering the reference bias point for the input stage, as balance is concerned dependent the rest of circuit. For the buffered stage altering the constant load and for the output stage the bias is altered. Hopefully this is most elegantly designed and stable, this is werry hard to achieve and i sertainly dont tink it is possible under all the varius loads and enviroment.
  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
making 25w constant class A amp space2000 Solid State 25 1st September 2008 06:07 AM
Output section on preamp questions/breakdown. kegger Tubes / Valves 6 6th December 2006 01:54 AM
Making of Lightforce 1 Class D Powerbriefcase Lars Clausen Class D 66 31st October 2006 12:46 AM
Output section impedance change query KBK Tubes / Valves 7 5th August 2006 02:47 AM
marantz da-12 and cd 7 output section please? lt cdr data Digital Source 1 21st May 2005 12:03 AM


New To Site? Need Help?

All times are GMT. The time now is 01:30 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