Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Class D Switching Power Amplifiers and Power D/A conversion

Bigger SMPS hurts sound quality?
Bigger SMPS hurts sound quality?
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 13th December 2013, 02:17 AM   #11
Destroyer OS is offline Destroyer OS  United States
diyAudio Member
 
Destroyer OS's Avatar
 
Join Date: Nov 2005
Location: PNW
Bigger SMPS hurts sound quality?
Ok... Try this instead because at least half of the options will screw up some other aspect to good sound.

Use more, smaller power caps.2x2200uf isn't sufficient. Whats the wattage? Try like 9000-10,000uf of high quality fast low ESR caps, but several. Like 6-10 caps. If you go over 10,000uf it's no big deal. Skip the big crappy 15kuf cap. Don't use the 2.2uf film. That's for 15w a channel or so, if you've got higher up it to around the same ratio.

Now for my latest trick... connect 6-10 low noise diodes across V+ and ground (you have V+ and ground, not V-, by the way). The should be in parrallel, and cathode to the + DC.

Don't use inductors, don't use big slow high ESR caps, don't use small caps that cause high frequency ringing, etc etc etc.

What makes class D sound good.

1. Fast, immediate current creates refinement, good high frequencies, timber, etc.

2. Constant voltage, so you have to use what looks like an excessive amount of caps, but it isn't for D. This is what gives you bass and even more importantly impressive body to all the sounds (insturments and voices). No I don't recommend a voltage regulator yet (maybe some day I'll figure how one can work right with class D).

3. As low noise possible on ground that can feed into the unit itself, or rather any sort of common-mode/ac/emi/rf/whatever, hence the use of making a dividing network for all non-forward noise on the DC. Noise on the positive isn't actually as destructive by comparrison (largely depending on frequency).

4. Power filtration before your SMPS to reduce the noise it puts out, and also reduce the noise it feeds back into the rest of your system. A few X rated caps is good too. There is a design refered to as the "Felix" that works well.
  Reply With Quote
Old 14th December 2013, 06:53 PM   #12
Bigun is offline Bigun  Canada
diyAudio Member
 
Bigun's Avatar
 
Join Date: Jan 2009
Location: Waterloo, ON or Herefordshire UK
Bigger SMPS hurts sound quality?
Quote:
Originally Posted by Destroyer OS. View Post
Now for my latest trick... connect 6-10 low noise diodes across V+ and ground (you have V+ and ground, not V-, by the way). The should be in parrallel, and cathode to the + DC.
Interesting. Is it the reverse bias capacitance of the diodes making them act like snubbers ???
__________________
"The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.
  Reply With Quote
Old 14th December 2013, 07:34 PM   #13
Destroyer OS is offline Destroyer OS  United States
diyAudio Member
 
Destroyer OS's Avatar
 
Join Date: Nov 2005
Location: PNW
Bigger SMPS hurts sound quality?
It's actually just about dividing noise. But no, I don't think that'd be part of the benefit. However maybe this is something I overlooked; perhaps you can explain how you think a flyback operation would work with a device that stays on?
  Reply With Quote

Reply


Bigger SMPS hurts sound quality?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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Quality Control differences = variations in sound quality? KT Class D 3 4th June 2014 12:02 AM
sound quality vs sound quantity. Etocynned Full Range 203 26th May 2012 03:36 AM
Optimal bass driver size for sound quality - is bigger really better? Antripodean Multi-Way 103 12th May 2012 10:55 PM
Assessing the quality of an SMPS commoncollector Power Supplies 4 24th January 2010 01:07 AM


New To Site? Need Help?

All times are GMT. The time now is 04:58 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki