Simple Audio Amplifier For Learning Purpose - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 14th August 2010, 01:42 AM   #1
diyAudio Member
Join Date: Jul 2009
Default Simple Audio Amplifier For Learning Purpose

Hello Everyone

I would like to learn the foundation of elementary electronics involved with designing a linear audio amplifier (class ab ideally). The final design might be produced. But my main aim is to design and simulate a working circuit on circuitmaker and learn the foundations ultimately. This is a private pet project which I am doing in my spare time on the weekends.

My knowledge so far of linear amplifiers is the 3 stage Architecture. The transcoductance stage, Transimpedance stage (Voltage-amplification stage) and output stage.

The transcoductance stage is a voltage controlled current source essentially that is comprised of a differential amplifier.

I have initially started the design of the linear amplifier with just a simple differential amplifier, composed of two npn transistors. In circuitmaker I just simulated the circuit to set the Q-point of the differential amp.

Like So

Imageshack - diffamp1.png

Now is where I am confused. How do i proceed from here onwards. I grounded one transistors base and feeded a 1KHz/ 1volt sinusoidal signal at the base of the other transistor. The single-ended output of the diff amp was taken into a ideal op-amp comprised of a transimpedance stage. But I don't know how if my testing and simulation method is correct.

Like so

Imageshack - circuit1x.png

I'll post the waveforms if requested. But I would say they are very wrong at the moment.

Whatever theory I got wrong, please correct me.
  Reply With Quote
Old 14th August 2010, 02:45 AM   #2
lineup is offline lineup  Sweden
diyAudio Member
lineup's Avatar
Join Date: Dec 2005
Location: the north
You have chosen a good start. Diff pair.
And you have most of it right.
Now, those things that are not right
... they are what you will learn best from .. and never forget.
Some little practice some days in a week
and soon you will handle SPICE almost like you handle your bike or car.
  Reply With Quote
Old 14th August 2010, 12:05 PM   #3
diyAudio Member
Join Date: Jul 2009
lol.. You forgot to tell me what are the things that are wrong in terms of my theory and understanding and also the circuit.
  Reply With Quote


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
Learning to be an audio tech? Doomlord_uk Construction Tips 8 14th December 2009 12:13 PM
Multi-purpose Power Amplifier domtw Chip Amps 22 23rd March 2009 02:18 PM
simple amplifier east electronics Solid State 12 26th January 2006 11:18 PM
Purpose of this capacitor in discrete amplifier? fluckscapacitor Solid State 35 5th September 2005 01:20 AM

New To Site? Need Help?

All times are GMT. The time now is 04:32 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2