designing an audio power amplifier - 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 12th May 2006, 01:34 AM   #1
mhcw550 is offline mhcw550  Canada
diyAudio Member
 
Join Date: May 2006
Default designing an audio power amplifier

Hi everyone!

Does anyone know a good book for designing an audio power amplifier? With lot of math, examples, input and output stage configuration and how to create, design and calculate them. Or could somebody learn to me with his personal notes? I would like to design my own power amplifier for subwoofer application. My first design was a total failure, this time I want to make the things correctly. I already have my own power supply (±70V from a 500VA 50-0-50 transformer and 4x15000uF) and the output transistors (MJ15003/MJ15004 or MJ15024/MJ15025).

Any help would be greatly apprecied.

Thanks

Edouard
  Reply With Quote
Old 12th May 2006, 02:46 AM   #2
diyAudio Member
 
Join Date: Sep 2002
Location: Milton Ontario
Well, you've asked a very broad question. There are many different classes of amplifiers, as you probably know. If you are looking to design class A amplifiers I'd read up on Nelson Pass' diy website (www.passdiy.com).

If you are looking for class A/B amplifiers I would read either High Power Audio Amplifier Construction Manual by Randy Slone or Audio Power Amplifier Design Handbook by Douglas Self.

Randy Slone's book is very good and skips some of the finer points of the amplifier design (also has 10 different finished designs). Self's book is much more scrutinizing and a lot of time is deticated to harmonic reduction techniques. He also talks about the other classes of amplifiers in detail.

Hope this helps.
  Reply With Quote
Old 12th May 2006, 01:42 PM   #3
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
I have read AND understood both D.Self, audio power amplifier design handbook and John L. Hood, The Art of Linear Electronics (deals with more than amps).

Their approaches are very different but seeing the slant each puts on the subject complements the other.

Both are highly recommended.
__________________
regards Andrew T.
  Reply With Quote
Old 12th May 2006, 02:14 PM   #4
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Default Re: designing an audio power amplifier

Quote:
Originally posted by mhcw550
Hi everyone!
I would like to design my own power amplifier for subwoofer application.
Edouard
Hi,

D. Self's book on power amplifiers is very good, but as he points
out, without the correct test equipment including a variac and an
oscilloscope, any self designed high power amplifier will likely end
in a very large puff of smoke and the builders tears.

For a one off high power amplifier you'd possibly be better
off restricting your activity to selecting a proven design.
By all means read design books and get a circuit simulator.
(free : tina ti or SwitcherCadIII).

Designing a power amplifier for sub use is relatively easy.
Most of the design issues / choices for power amplifiers relate
to the behaviour above 1KHz, for a sub this doesn't matter.

What does matter is that it doesn't self destruct or is a fire hazard.

I find this quite amusing :

http://sound.westhost.com/project117.htm

Take a look at the double output stage version of this :

http://sound.westhost.com/project68.htm

/sreten.
  Reply With Quote
Old 13th May 2006, 03:35 AM   #5
Eva is offline Eva  Spain
diyAudio Member
 
Eva's Avatar
 
Join Date: Oct 2003
Location: Near the sea
Send a message via MSN to Eva
What did exactly fail in your first design? You have to think a lot about that.

Also, don't get obfuscated thinking in terms of transformers and capacitors all the time, these are very irrelevant issues into which only people that does not understand further into amplifier design tends to focus. There are much more important things like circuit design, semiconductor selection, frequency stability, open loop linearity analysis and PCB and wiring layout.
__________________
I use to feel like the small child in The Emperor's New Clothes tale
  Reply With Quote
Old 14th May 2006, 03:36 PM   #6
mhcw550 is offline mhcw550  Canada
diyAudio Member
 
Join Date: May 2006
Hi!

Transformer and capacitors are just the parts I want to keep from my previous design because they are costly. I know there are many factors to take in consideration in a power amplifier, but power supply is also a very important part for me. High current output stage come with high current power supply and big filter capacitors give you high short term peak and punch. In my previous design I think this is my biasing circuit that destroyed all the output stage.

Thanks AndrewT and RobPhill33 for your suggestion. I will take a close look at this.

Project 68 from Elliott Sound Products seem to be very interessting. I think I will go with that one.

Edouard
  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
Designing the best solid state analog home audio amplifier ever (self) build. Marc Vi Solid State 17 19th October 2011 07:56 AM
DIY Power Amplifier designing by Listening Only lineup Solid State 67 23rd August 2010 02:56 AM
crest audio power amplifier hienrich Solid State 7 18th January 2005 12:28 AM
Need help on designing aspects of audio amplifier kenle545 Solid State 0 27th December 2004 06:34 AM


New To Site? Need Help?

All times are GMT. The time now is 11:26 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