Looking for tutorial on transistor long tailed pair - 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 9th February 2012, 11:18 AM   #1
diyAudio Member
 
Join Date: Jul 2011
Question Looking for tutorial on transistor long tailed pair

Hi guys,I'm looking for a tutorial on the long tailed pair differential amplifier topology for transistors, BJT or FET. All I can find by googling is opamps as differential amplifiers or valves as long tailed pair phase inverters.Specifically what I wanted to do is make a single-ended non-inverting amplifier with negative feedback into the inverting input, just like a very simple op amp in a standard non-inverting amplifier topology but from discrete parts. I'm aware that going to discrete parts instead of using opamps is rarely a good thing, but this is more for educational purposes than trying to achieve some advantage over an opamp.I've made a simple BJT spice model, with a voltage buffer before the feedback, but it doesn't seem to work the same as an opamp. It does amplify, but the input headroom is tiny regardless of feedback factor and the inverting and non-inverting inputs seem not to be tightly coupled together as one would expect from a negative feedback opamp.I only put this together from the knowledge that it works as a common collector coupled to a common base by their emitters, so any guidance on biasing etc would be helpful, and if there's a website that explains this well, that's be great. It doesn't have to be specifically to do with audio amplifiers.Cheers,Matt
  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
Long-Tailed Pair, pse. share your views... tricomp Tubes / Valves 9 20th December 2010 10:34 PM
long tailed pair - need more gain hidnplayr Tubes / Valves 37 21st October 2010 09:52 AM
Long tailed pair schematic questions martyh Tubes / Valves 17 28th January 2009 11:27 PM
LTPZen, Zen with long tailed pair input stage Allen Newby Pass Labs 18 28th January 2007 04:19 PM
Long Tailed Pair Modification lubbie Solid State 31 11th May 2004 08:11 AM


New To Site? Need Help?

All times are GMT. The time now is 09:02 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