Class D is nonaudiophile, not hi fi system, they are saying that! - Page 6 - diyAudio
Go Back   Home > Forums > Amplifiers > Class D
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 10th March 2005, 01:26 PM   #51
diyAudio Member
Join Date: May 2002
Location: Switzerland
From my understanding, you can say that ClassD has openloopbandwidth flat to ......
IF you want to use NFB then you will for sure have to make a trade-off. You can't get flat open-loop FR up to the carrier frequency AND apply NFB at once. So you may most probably use a topology with a flat open loop gain up to 10 or 20 kHz (which alone beats many class-AB amps !!!). The loop itself is much easier to calculate than with an ordinary class AB. And if you still want more NFB then you can use a multiloop topology.

I remember how we listened to a classs-d amp we once developed (in 1991) that had THD as high as 0.44 % but an open-loop BW of 15 kHz and it did not sound harsh in any way - the contrary was true in fact . And this amp was not even intended as audio amp at all but as a lab power source.


  Reply With Quote
Old 10th March 2005, 01:45 PM   #52
MikeB is offline MikeB  Germany
diyAudio Member
MikeB's Avatar
Join Date: Apr 2004
Location: GŁtersloh
Okay, i was speaking about selfoscillating topology, already having
NFB inside, with full openloop-FR. The nice thing with selfoscillating is,
as it is intended to oscillate, no stabilizing in any form is necessary...

  Reply With Quote
Old 11th March 2005, 10:19 PM   #53
diyAudio Member
maxlorenz's Avatar
Join Date: Oct 2003
Location: osorno , Chile
IMHO, one of the beauties of UCD amps (I've not heard other classD amps) is that, being able to drive and make sound very good even non HiEnd speakers, and making good partnership with transformer based volume controls, one really can focus (money an effort) on the source!

Enjoy your music now...

  Reply With Quote
Old 12th March 2005, 07:51 AM   #54
R Dijk is offline R Dijk  Norway
diyAudio Member
Join Date: Mar 2005
Location: i live here
I see no reason to amplify "everything"
Click the image to open in full size.
  Reply With Quote
Old 12th March 2005, 08:49 AM   #55
diyAudio Member
destroyer X's Avatar
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default hehe, that was good...Big Charlie, the amplifier!

Thank's man!

I am hearing, rigth now...Scotish pipe music with drums....yeah!...very good when amplified with class D


Full throotle amplifier manufacturing;, Sample Dx Classic
  Reply With Quote
Old 12th March 2005, 11:23 AM   #56
jmateus is offline jmateus  United States
diyAudio Member
jmateus's Avatar
Join Date: Mar 2003
Location: US, New Jersey
Default Big Charlie...the amplifier

Scotish bag pipes are wonderful, they make music right to be
amplified by Class D, class T amplifiers, like the modules of
Is this a pretext to speak about these modules? I have to resist to
the impulse of speaking about these modules, they look gorgeous,
I'm about to finish one but I didn't as of yet.
May be later...

But Carlos, how about a military march from Germany?
JLH 2005, Cyrus and so on...
  Reply With Quote
Old 12th March 2005, 01:17 PM   #57
diyAudio Member
destroyer X's Avatar
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default I was interested in some translations, but my German friend do not like to talk about

This subject..... i do not know his reason, but must exist a good reason to avoid.... some cloudy days to Germany i suppose.

But i visited Heindrich Grune in Petropolis, they buried a lot of old Nazi enormous phonograph discs.... i was there to recover that historic material..... and i made recordings.... and have a lot of conversations on it.....i do not understand 90 percent of the words.

Those voices, hard to understand, because of old recording quality, despite re-adjusted, are noise and unclear, but in my class D, the reproduction is more clear....the unit that can let me understand some words.

Where's the pictures?..... what about the popping, jumping SMDs?

You can put some rubber point when fixing it to solder, to avoid send them to "space"....hehe...they like to fly away, and no one can find them in our "damned trashed dirty laboratories!"

Full throotle amplifier manufacturing;, Sample Dx Classic
  Reply With Quote
Old 12th March 2005, 03:39 PM   #58
dmason is offline dmason  United States
diyAudio Member
Join Date: May 2004
Location: Republik of Kalifonia

Can any of the current or future UcD chips allow for battery power?
"Pilau Buggah, Big Islan Mo Betta!!"
  Reply With Quote
Old 12th March 2005, 09:23 PM   #59
IVX is offline IVX  Russian Federation
diyAudio Member
IVX's Avatar
Join Date: Jul 2003
Location: Everywhere (Buddhist's context)
If you'll see the power comparator for around 9V operation, hence UcD will, because the UcD=comparator+feedback network(fully passive components).
Best regards,
  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
1500W RMS Class D PCB - which Class D Driver Chip is it ? mosfetsound Class D 11 1st April 2011 11:17 AM
How about a round-up of Class A kit power amps, or collectable vintage class A? Brisso57 Solid State 4 14th February 2007 10:30 AM
Your Class D (SI, Amp6, Charlize, etc.) System irss Class D 38 30th May 2006 01:55 PM

New To Site? Need Help?

All times are GMT. The time now is 01:15 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