I haven't played with class D in a while, are we at PASS level yet? - Page 26 - 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 19th March 2012, 03:41 AM   #251
JZatopa is offline JZatopa  United States
diyAudio Member
 
Join Date: May 2003
Location: Chicago
I'm curious, has there been a class D design that is modeled after the Blameless amplifier. By that I mean the design was made to perform as good as you could possibly get before you add in feedback? I am not sure if this thought process works on class D design but I am not sure why it wouldn't.
  Reply With Quote
Old 19th March 2012, 10:27 PM   #252
Pafi is offline Pafi  Hungary
diyAudio Member
 
Join Date: May 2004
Location: Budapest
Eva made power stage essentially distortion-free. (No dead time.) The other open-loop distortion-source is power supply. Stabilised, synchro-rectified PSU.
  Reply With Quote
Old 20th March 2012, 03:37 PM   #253
diyAudio Member
 
sakellogg's Avatar
 
Join Date: Nov 2008
Location: dixon ill
ok, i just read all 26 pages.
i have no answer for the op, but ive learned allot.
i have listened to class D amps ....Bel canto i think (little gray box mono blocks 500W if i remember right.) on joseph audio speakers and psb. i remember i thought i didnt like either speakers at all untill the guy demoing them said i bet i know why, he changed to a nad intergrated low watt and i found the music much more pleasing.
why? i dont know. but i am going to build some class D monos now to see what im learning here. now im curious.
ill be compairing them to anthem amps and diy alephs, on paradigm spekers.
i wonder what ill hear and how that transfers to what i see on a scope?
please forgive spelling no check useing my phone.
__________________
I'm not crazy, my mother had me tested
  Reply With Quote
Old 4th April 2012, 05:48 AM   #254
JZatopa is offline JZatopa  United States
diyAudio Member
 
Join Date: May 2003
Location: Chicago
Quote:
Originally Posted by Eva View Post
Sound travels at approx 345 meters per second in air. When you are listening 2 meters away from the speakers what you hear is not the original signal, it's the original signal with 6 milliseconds of group delay across the audio band (plus other components). Filters (and amplifiers) behave almost in the same way across their pass band. Speakers are much worse because their group delay is not constant.

Is that distortion? Nerd thinking.

Signal does not propagate infinitely fast. Everything adds delay/phase shift.
True but as they say GIGO. The more accurate you can make every part of the system, the better the end result.

How about this for an idea. Instead of just measuring thd+N, we measure thd+n and IMD and phase distortion and temporal/transient distortion and make that a new measurement that takes into account every way a signal can be distorted. We can call it TSD or total signal distortion.
  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
Anybody played with Self Class A bias regulator? mlloyd1 Solid State 18 23rd August 2014 02:04 AM
line level high pass filter rbrockman Analog Line Level 3 13th December 2008 05:21 AM
Line-Level Low-Pass Filter Design JustinAtGT Chip Amps 10 31st May 2006 08:48 AM
Passive Line Level High Pass noodle_snacks Multi-Way 6 27th January 2006 11:19 AM
high-pass filter (low-level) keyser Parts 3 6th December 2004 03:02 PM


New To Site? Need Help?

All times are GMT. The time now is 11:18 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