output transistor topology question - 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 22nd July 2014, 11:16 PM   #1
diyAudio Member
 
lazzer408's Avatar
 
Join Date: Sep 2010
Location: Chicago
Default output transistor topology question

In a push-pull output stage, what's the difference between the pair being one NPN and one PNP vs. both being NPN?

Am I correct in saying the latter is "quasi complementary"?

Last edited by lazzer408; 22nd July 2014 at 11:19 PM.
  Reply With Quote
Old 22nd July 2014, 11:25 PM   #2
diyAudio Member
 
nigelwright7557's Avatar
 
Join Date: Apr 2008
Location: Carlisle, England
NPN/PNP is complimentary.
NPN/NPN or PNP/PNP is quasi complimentary.
  Reply With Quote
Old 22nd July 2014, 11:28 PM   #3
diyAudio Member
 
lazzer408's Avatar
 
Join Date: Sep 2010
Location: Chicago
Acoustically, what's the difference? What are the pros/cons to complimentary vs. quasi complimentary?
  Reply With Quote
Old 22nd July 2014, 11:31 PM   #4
diyAudio Member
 
nigelwright7557's Avatar
 
Join Date: Apr 2008
Location: Carlisle, England
There should be little if no difference in sound, at least that's what I found.
Quasi comes from the days of few PNP power transistors.

I have found in my designs the quasi was a little harder to bias as it wasn't quite as stable due to gain in the lower driver.
I also found oscillation troubles again with the lower driver. I fixed this with a BC capacitor on the lower driver.
  Reply With Quote
Old 23rd July 2014, 02:07 AM   #5
diyAudio Member
 
Join Date: Nov 2013
A good article about output stage topology from Rod Elliot click here.
  Reply With Quote
Old 23rd July 2014, 03:54 AM   #6
diyAudio Member
 
lazzer408's Avatar
 
Join Date: Sep 2010
Location: Chicago
I'm contemplating these China kit amplifiers and trying to find what makes one different then another.
  Reply With Quote
Old 23rd July 2014, 04:00 AM   #7
jcx is offline jcx  United States
diyAudio Member
 
Join Date: Feb 2003
Location: ..
Self's Audio Power Amplifier Design Handbook, later editions gets you up to speed on "conventional " audio design pretty quick - Cordell too but he spends more time on Mosfet outputs
I believe I've seen Duncan's and Sloan's much older books online
  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
Can bias transistor mount on top(body) of output transistor?? Leolabs Solid State 23 16th February 2008 12:35 AM
Output transistor question ThSpeakerDude88 Solid State 15 29th July 2005 10:25 PM
Aleph output topology question mpmarino Pass Labs 3 15th February 2005 06:06 PM
output transistor biasing question? crippledchicken Solid State 7 16th April 2004 12:48 AM
New P-P output topology? the Elliptron smoking-amp Tubes / Valves 14 16th February 2002 08:02 PM


New To Site? Need Help?

All times are GMT. The time now is 04:57 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