Class H amplifier idea - diyAudio
Go Back   Home > Forums > Amplifiers > Class D

Class D Switching Power Amplifiers and Power D/A conversion

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 December 2010, 09:14 AM   #1
Mondan is offline Mondan  Romania
diyAudio Member
 
Join Date: Mar 2010
Thumbs up Class H amplifier idea

I read this:
Geek Circuits Class D amp using TL494 DC to DC converter chip

And I think:
Can I make a SMPS with audio modulation?
And to put the voltage v obtained on class AB amplifier.
Amplifier will have the same audio signal.

In this way it will improve efficiency.
There is no loss of power on "output" transistors.

Sorry if my english is not good.


Dan
  Reply With Quote
Old 12th December 2010, 05:13 PM   #2
diyAudio Member
 
nigelwright7557's Avatar
 
Join Date: Apr 2008
Location: Carlisle, England
This is not a new idea.

Class D is close to an SMPS anyway.
  Reply With Quote
Old 12th December 2010, 05:20 PM   #3
Mondan is offline Mondan  Romania
diyAudio Member
 
Join Date: Mar 2010
Thanks to the response.
That is.But a class AB amplifier has a superior sound quality than a class D.

I think in this way we have quality of class AB and efficiency of class D.
  Reply With Quote
Old 12th December 2010, 09:52 PM   #4
diyAudio Member
 
nigelwright7557's Avatar
 
Join Date: Apr 2008
Location: Carlisle, England
Quote:
Originally Posted by Mondan View Post
Thanks to the response.
That is.But a class AB amplifier has a superior sound quality than a class D.

I think in this way we have quality of class AB and efficiency of class D.
I have designed class d and class ab and to be honest cant tell the difference.
Both give clear and good bandwidth sound.

I guess it depends how well they are designed as to which might sound better.
  Reply With Quote
Old 12th December 2010, 11:35 PM   #5
diyAudio Member
 
Saturnus's Avatar
 
Join Date: Jun 2005
Location: Copenhagen, Denmark
Quote:
Originally Posted by Mondan View Post
Thanks to the response.
That is.But a class AB amplifier has a superior sound quality than a class D.
I don't know what on earth gave you that idea. The very best amplifiers I've ever heard have all, without exception been some form of class-D amps (Tripath, UcD, TACT etc.).

I should note that I've listened to hundreds of amps.

Last edited by Saturnus; 12th December 2010 at 11:37 PM.
  Reply With Quote
Old 13th December 2010, 10:34 AM   #6
NMOS is offline NMOS  Germany
diyAudio Member
 
NMOS's Avatar
 
Join Date: Dec 2010
Location: Frankfurt
Quote:
Originally Posted by Saturnus View Post
I don't know what on earth gave you that idea. The very best amplifiers I've ever heard have all, without exception been some form of class-D amps (Tripath, UcD, TACT etc.).

I should note that I've listened to hundreds of amps.

I claim....this is not true a class AB amplifier has really a superior sound quality than a class D

Compare to some 15 - 30 years old Class AB professional amps TRIPATH Class D and newer IRF IC design Class D with IRS 2092 IC, IR2010 IC.... sound terrible in mid and high, only effeciency for bass

If I will find good sounding powerful class D in future it will change my views
  Reply With Quote
Old 13th December 2010, 10:38 AM   #7
qsa is offline qsa  Germany
diyAudio Member
 
qsa's Avatar
 
Join Date: May 2007
Quote:
Originally Posted by Saturnus View Post
I don't know what on earth gave you that idea. The very best amplifiers I've ever heard have all, without exception been some form of class-D amps (Tripath, UcD, TACT etc.).

I should note that I've listened to hundreds of amps.

Test Class D amps in premium PA, no way the sound is hard and not amazing

you will replace with class AB / H amps

with low output power "Hi-FI" Class D sound good with "Hi-FI" speakers but high output power.... only bass

Last edited by qsa; 13th December 2010 at 10:41 AM.
  Reply With Quote
Old 14th December 2010, 01:46 AM   #8
ontoaba is offline ontoaba  Indonesia
diyAudio Member
 
ontoaba's Avatar
 
Join Date: Nov 2009
Location: Kudus, Malang, Dieng
That because of its very low output impedance. That means no loudspeaker free space for its reflected moving. The loudspeaker will receive more heat, and less reflex. It is totally forced. It also happen in some MOSFET amplifier that also has hig DF with it.
That is, why class D always fail with total failures and the designers don't know why and still saying class D is the best. Hear it for long time listening and you will notice the difference, compare it with your low DF class AB, 50-200DF in this case.
I am stop with ClassD and leave it years ago and never interested in it again. The best is tracking rail right now. It gives constant Vce or Vds (for mosfet) that very helpful to deal with voltage characteristics.

Yes this idea is the best but not new one:
This one is discussing more witth it Class-AB meets Class-D: Yamaha's EEEngine Topology - where are this Diy Projects?

Last edited by ontoaba; 14th December 2010 at 01:59 AM.
  Reply With Quote
Old 14th December 2010, 05:47 AM   #9
luka is offline luka  Slovenia
diyAudio Member
 
luka's Avatar
 
Join Date: Sep 2005
Location: in Slovenia :)
Send a message via Skype™ to luka
Quote:
Originally Posted by NMOS View Post
I claim....this is not true a class AB amplifier has really a superior sound quality than a class D

Compare to some 15 - 30 years old Class AB professional amps TRIPATH Class D and newer IRF IC design Class D with IRS 2092 IC, IR2010 IC.... sound terrible in mid and high, only effeciency for bass

If I will find good sounding powerful class D in future it will change my views
And that is your opinion, I don't find anything terrible in all of the range...really depends on what you have listen to, how it was set up and so on
__________________
home page @ http://www.classdaudio.tk/ @ 24/7 all year long
I FEEL SLOVENIA
  Reply With Quote
Old 14th December 2010, 05:49 AM   #10
diyAudio Member
 
Workhorse's Avatar
 
Join Date: Dec 2004
Quote:
Originally Posted by qsa View Post
Test Class D amps in premium PA, no way the sound is hard and not amazing

you will replace with class AB / H amps

with low output power "Hi-FI" Class D sound good with "Hi-FI" speakers but high output power.... only bass
I don't agree
  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
New idea for low dissipation Class A amplifier. Mooly Solid State 69 1st December 2009 11:11 PM
Got 2x65VAC PS, any idea on Class-D amplifier module? barco Class D 0 16th October 2008 03:21 PM
Just an idea: Tubes and Class D NeoY2k Class D 5 6th September 2008 08:43 PM
Pure Class A Single End Amplifier Idea! Dxvideo Solid State 91 1st September 2008 11:54 AM
Another Class A headamp idea Dxvideo Solid State 3 19th November 2007 09:08 AM


New To Site? Need Help?

All times are GMT. The time now is 12:52 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