typical unwanted amp byproducts - Page 2 - 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 8th January 2008, 05:10 PM   #11
diyAudio Member
 
Join Date: Nov 2007
I've used these inductors previously, but at frequencies not much higher than 100 Khz.

Although the data sheet does not mention the core material specifically, or its operating frequency, there are two key words in the datasheet: "Low Cost".
This would essentially mean a low grade core, which would have excessive losses at the frequencies you are working with.

The same vendor offers the same 2200-series of toroids, in a low core-loss format.
Check out the following link: http://www.bourns.com/pdfs/2200ll_series.pdf
  Reply With Quote
Old 15th January 2008, 02:42 AM   #12
diyAudio Member
 
gearheadgene's Avatar
 
Join Date: Jul 2005
Location: CT
fyi - I played some audio through the amp for the first time tonight. It sounds pretty good! Nothing is optimized yet. The audio source is an MP3 player that really doesn't have enough zip to drive the amp to full output - yet it's pretty loud.

One thing that stands out immediately is that there is some pretty obvious high frequency hiss coming from the mid-range and tweeter. Even with the input removed, the amp is generating this noise. Can anyone comment on acceptable or typical noise floor?


I attached a picture of the lab/garage with the amp running!
Attached Images
File Type: jpg d_amp_yae.jpg (97.6 KB, 171 views)
  Reply With Quote
Old 17th January 2008, 06:19 PM   #13
Cheops is offline Cheops  Estonia
diyAudio Member
 
Join Date: Feb 2006
Location: Home?!
The core material is iron powder and the color marking is yellow-white(seen on the second picture, probably T106-26 type).Its not intended to work at these frequencies(400kHz in your project).Those are used in SMPS at some 20...25kHz.But they will do OK if u use them in rail voltage filters.In my last project I tried T106-2(color marking red or red-dark green).In my project they donīt even get warm.Here is some pretty cool calculator.

http://www.66pacific.com/calculators/toroid_calc.aspx



BTW The original schematic is not mine
  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
sub making unwanted noises busterno1 Subwoofers 3 26th August 2007 10:12 AM
unwanted spying and listning in my home andrew2007 Everything Else 17 1st May 2007 06:36 AM
Typical 2A3 hum? bobhayes Tubes / Valves 31 17th October 2005 01:12 PM


New To Site? Need Help?

All times are GMT. The time now is 12:28 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright Đ1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2