My very first Class D pwm (switching) amplifier. - Page 51 - diyAudio
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Class D Switching Power Amplifiers and Power D/A conversion

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Old 25th March 2004, 05:08 PM   #501
tiki is offline tiki  Germany
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Hi sfx,

congratulations for your development! The Thunderball looks nice, especially the simplicity is very interesting.
My first try with the Sörensen-design was not so succesful, I blowed the power stage two times.

I'm looking for a relatively simple solution as a first shot. The BCA-design seems to be interesting also, is it possible to see your schematic soon? I would try to extend it to the entire audio range.

Best regards, Timo
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Old 26th March 2004, 04:14 PM   #502
johanps is offline johanps  Sweden
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Tiki,

did you get it to work, eventually? (I'm just curious to know )

Regards / Johan Sörensen.
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Old 29th March 2004, 03:24 PM   #503
tiki is offline tiki  Germany
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Hi Johan,

unfortunately not, because my 15 years old sun begun to sing and play the electric guitar in a school-band some month ago. Therefore they need 'big' loudspeakers, which we are building now. It took five weekends fulltime and a lump of money until now and they aren't ready yet.

The amplifier has to wait a little. The Uni-project-PWM-amp diverges somewhat because of the different needs. This amp is still in progress also.

But I'm interested in all improvements regarding the class-d amp, even though on a more theoretical basis temporarily.

Regards, Timo
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Old 30th March 2004, 01:38 PM   #504
johanps is offline johanps  Sweden
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Quote:
Originally posted by tiki

But I'm interested in all improvements regarding the class-d amp, even though on a more theoretical basis temporarily.
I see. Myself, I am currently engaged in building a SMPS to drive my amp(s) with.

However, when I feel ready for it, I plan to revisit the feedback topology of my amp - the "leapfrog" design method seems to provide some new openings to incorporate feedback from the output filter...
Right now, I'm employing moderately "light" filtering with a 20uH coil followed by 470nF cap. This is enough to keep my TV-set and radio receiver happy, but might not pass CE EMI tests :-)
I am very happy with the way my amplifier sounds, although I have been told by one auditioner that it seemed a bit lacking in dynamic response (treble, not bass!). So I guess the step response might be somewhat muted by the output filter; thus being an area for improvement.

Regards / Johan.
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Old 30th March 2004, 04:14 PM   #505
IVX is offline IVX  Russian Federation
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Hi Johan,
how much THD, IMD, damping factor gotten from this amp? I can't find the specs on your site.
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Old 30th March 2004, 06:35 PM   #506
johanps is offline johanps  Sweden
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Quote:
Originally posted by IVX
how much THD, IMD, damping factor gotten from this amp?
Well, that's the embarrasing part: I haven't gotten around to do any formal measurements on my latest channels. I did do some rudimentary tests on my "2.1" version, and found 0.024 %THD @1Khz and 10W. (It was more limited in terms of power ability.)
People keep bugging me about measurements, but since I'm not selling the amp, I never seem to get around it

Best Regards / Johan.
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Old 21st April 2004, 09:51 AM   #507
lkadar is offline lkadar  Hungary
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Question sfx's amp

Hi All!

I'm a newbie in class D amps .
I saw sfx's amp and it looks realy good .

Dear sfx,
could you send me the schematic or it doesn't ready yet ?

lkadar.
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Old 21st April 2004, 12:46 PM   #508
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Talking Re: Just tested my new Class D Amp

Quote:
Originally posted by sfx
I'd really like to thank Circlotron for his description of his BCA-Amp earlier. It was a great help for my design! I hope you read this...
Yay! My life now has some meaning.
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Old 21st April 2004, 10:47 PM   #509
Ryssen is offline Ryssen  Sweden
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Quote:
could you send me the schematic
Me too!!!
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Old 22nd April 2004, 06:44 AM   #510
tiki is offline tiki  Germany
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Default Thunderball

Hi Felix,

hehe, all the guys are keen on your design, mee too, of course. I would like to use it for this.
If you finished the schematic, will you post it?

Many Thanks in advance!
Timo

Off topic:
If anybody has to decide, which schematic capture/layot program should be used - be careful with Orcad (V10)!
Yesterday I lost my project, don't know if the support will be able to recover it. I love the DOS-Version from 1989 instead.
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