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Class D Switching Power Amplifiers and Power D/A conversion

typical unwanted amp byproducts
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Old 8th January 2008, 05:10 PM   #11
fernando_g is offline fernando_g  United States
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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
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Old 15th January 2008, 02:42 AM   #12
gearheadgene is offline gearheadgene  United States
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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!
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File Type: jpg d_amp_yae.jpg (97.6 KB, 171 views)
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Old 17th January 2008, 06:19 PM   #13
Cheops is offline Cheops  Estonia
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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.


BTW The original schematic is not mine
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