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Class D Switching Power Amplifiers and Power D/A conversion

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Old 10th August 2020, 06:34 AM   #621
stewin is offline stewin  Kenya
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It can support up to 2ohms stable at +/- 49vlts , just increase the inductor to 35uh
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Old 10th August 2020, 06:50 AM   #622
stewin is offline stewin  Kenya
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Hi all classd family !
I have a question to you all . If I change c10 from 0.47uf to about 10uf , what is the downside? And will the low frequency improve to drop low to about 10hz ??
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Old 11th August 2020, 04:49 PM   #623
sweetperfume is offline sweetperfume  India
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I don't think it will do any difference in lower frequency response. But it surely will hurt frequencies above 1khz. I might be wrong.

Last edited by sweetperfume; 11th August 2020 at 04:53 PM.
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Old 11th August 2020, 04:52 PM   #624
sweetperfume is offline sweetperfume  India
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Quote:
Originally Posted by stewin View Post
It can support up to 2ohms stable at +/- 49vlts , just increase the inductor to 35uh
I tested with 33uh. But only change is tgat i used 1m instead of 10m on pin 2 to 1 of tl074. Will that hurt efficiency that much?. And did you do resistor load testing? What efficiency did you get?
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Old 12th August 2020, 01:11 AM   #625
stewin is offline stewin  Kenya
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Quote:
Originally Posted by sweetperfume View Post
I don't think it will do any difference in lower frequency response. But it surely will hurt frequencies above 1khz. I might be wrong.
yes thanks ,i tried 22uf and no noticeable change on low frequency
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Old 12th August 2020, 01:14 AM   #626
stewin is offline stewin  Kenya
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Quote:
Originally Posted by sweetperfume View Post
I tested with 33uh. But only change is tgat i used 1m instead of 10m on pin 2 to 1 of tl074. Will that hurt efficiency that much?. And did you do resistor load testing? What efficiency did you get?
use all parts exact as at the schematic i told you, that is the 10m should remain 10mega . the inductance that is the one i saw has a significance change when increased. by the way what type of inductor are you using?
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Old 12th August 2020, 03:05 AM   #627
sweetperfume is offline sweetperfume  India
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I used both micrometals -2 & sendust 60 material.
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Old 12th August 2020, 03:07 AM   #628
sweetperfume is offline sweetperfume  India
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Quote:
Originally Posted by stewin View Post
use all parts exact as at the schematic i told you, that is the 10m should remain 10mega . the inductance that is the one i saw has a significance change when increased. by the way what type of inductor are you using?
What efficiency did you get?
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Old 24th September 2020, 02:02 AM   #629
profmocha is offline profmocha  Egypt
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Hello guys,
Has anyone tried this?

How to Build a Class-D Power Amp - Projects
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