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 21st March 2009, 06:37 PM   #471
wtfaidh is offline wtfaidh  Netherlands
diyAudio Member
 
Join Date: Jan 2005
Location: Nederland
Quote:
Originally posted by bro
I prefer small amps so that I can chuck them around in my small apartment.
I am afraid that my primary transformers (42V-0/0-42V, 1000 Watt) will not fit in a tihgt case... ;-)

Using a "Airport Express" for conveniance is a fine choise (I am using a SqueezeBox Myself),

But if you want to hear the NCD's sing : use a conventional CD player...!!!

Cheers, Eric.
  Reply With Quote
Old 22nd March 2009, 05:29 AM   #472
bro is offline bro  Singapore
diyAudio Member
 
bro's Avatar
 
Join Date: May 2006
Quote:
Originally posted by wtfaidh

42V-0/0-42V, 1000 Watt
Does it hum? I could hear mine when I put my ear next to it. Would potting the center help?

I tend to agree on the CD player. Need to get a preamp to hook up my sacd player. hmm, more projects!

cheers,dan.
  Reply With Quote
Old 19th July 2009, 04:13 PM   #473
cdl is offline cdl  Denmark
diyAudio Member
 
Join Date: Aug 2003
Location: Copenhagen
Default Status on EMC

I posted previously about my EMC problems in relation to DAB reception (and probably FM as well, but I don't use that currently). The problem with DAB is intermittent (mostly at sunrise and -set, and especially strong just after turning on the amp, tends to decrease when the amp has been on for a while). I also noticed that having a D-Link USB WAN adapter close to a speaker cable caused significant bandwidth deterioration (even with EMC kit), but moving it 1m away from the speaker cable solved the problem.

First test with the EMC kit was promising, but with long speaker cables attached, the problem was back, although less severe.
The other day I finally attached my new speaker cables (3m x4 for biwiring), which seems to further reduce the problem a bit, but it's still noticeable :-/

On the brigth side, reception is tolerable now. The following 4 things have reduced the EMC:

1) Moved DAB antenna away from the amp connecting it through some 4m of shielded cable. Carefully separated "noisy" speaker cables from the antenna cable in the "snake garden" behind the hifi (speaker cables go right, antenna goes to the left). Attached clamp-on ferrites to the shielded cable at the antenna connector on the tuner (doesn't seem to limit signal strength)
2) Mounted EMC kit and clamp-on ferrites chokes on all power cables.
3) Replaced long speaker cables (4x7m) with shorter ones (4x3m)

The only further thing I can think of would be to attach some 0.1F caps in series with the speakers at the terminals on the amp (yes I know this might affect the treble). Will try this once I come across the ones I have lying around somewhere, I guess i'll just connect them to some banana connectors and try plugging them in to see if it helps.

Otherwise I am out of ideas. So Lars, you are most welcome with your spectrum analyzer any time

/cdl
  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
Some Quad els57 questions! - Novice Questions! Fanuc Planars & Exotics 13 5th December 2007 09:26 AM
PSU for QSC amp questions rkc7 Parts 5 10th November 2005 05:18 PM
Last questions about this Madmike2 Multi-Way 9 13th June 2005 11:12 PM
Questions, questions, from newb DIYer Phatman91624 Multi-Way 41 3rd August 2002 02:52 AM


New To Site? Need Help?

All times are GMT. The time now is 08:49 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