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Old 16th August 2008, 04:56 PM   #1
h_a is offline h_a  Europe
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Default Pavel Macura's CFP amp

Hi all,

I'm currently very much interested in complementary feedback pair topologies and found some references to one of Pavel Macura's (PMA) amps, it seems to be from about 2003 using a CFP-output stage in diamond buffer like topology.

From what I read the amp was presented on his website, but unfortunately no longer is.

Maybe somebody could point me to a schematic? Or mail it to me?

I also mailed PMA, however it would be great if I could have a look at it during the weekend ;-))

Thanks a lot!

Have fun, Hannes
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Old 16th August 2008, 05:18 PM   #2
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I have designed three CFB amps and the performance is quite nice
http://www.diyaudio.com/forums/attac...amp=1131985828
http://www.diyaudio.com/forums/showt...872#post732872

jmd01 made some measurements
http://www.jmd.szm.sk/Audio/Measurem...mp/CF_amp.html
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Old 16th August 2008, 06:05 PM   #3
lineup is offline lineup  Sweden
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Default Re: Pavel Macura's CFP amp

Quote:
Originally posted by h_a

I'm currently very much interested in complementary feedback pair topologies and found some references to one of Pavel Macura's (PMA) amps, it seems to be from about 2003 using a CFP-output stage in diamond buffer like topology.
-------------
Thanks a lot! Have fun, Hannes

I had a look into My PC SATA harddrive >>>>>
Quote:
C:/My documents/DiyAudio Persons/h_a Hannes/
----
C:/My documents/DiyAudio Persons/planet10 David Dlugos/
C:/My documents/DiyAudio Persons/PMA Pavel Macura/
C:/My documents/DiyAudio Persons/powerbecker/
In the personal folder of PMA, along a lot of other of his junk
I found this one.
Hope this is what you are after, Hannes.
Let's share it with everybody ... not just via email to some chosen few.

Regards & Have Fun! Lineup

PS.
Should it be another buffer you need,
I have several other PMA-buffers ---> no longer public
DS.
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Old 16th August 2008, 06:15 PM   #4
h_a is offline h_a  Europe
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Thanks a lot for all the info, Lineup and Per-Anders!!

Great, lots to read and think about.

It's a pity, but the shown buffer is not what I mean

I mean a power amp, if I'm not mistaken it's running in ClassA.

I really hope PMA shows up and maybe he even posts it!

Of course I would love to see it here, however it's his work, and of course he's free to do so or not.

Have fun, Hannes
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Old 16th August 2008, 07:19 PM   #5
MaxS is offline MaxS  France
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Hello everyone,

Are the output transistors BJT or FET ?

I've a little collection about PMA design. ( DPA's too )
If you know let me know more details about the schematic, I'll do my best to provide your beloved schematic.

Max
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Old 17th August 2008, 09:35 AM   #6
h_a is offline h_a  Europe
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Thanks for all your help!

Seems the amp in question was the PM-A1 which can - by the way - be easily found using webarchive....I should have thought of that yesterday

All very interesting, so lets play a bit

Have fun, Hannes

PS: I would attach the schematic here, but I'm not sure wether Pavel would agree with this?
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Old 17th August 2008, 10:34 AM   #7
AndrewT is offline AndrewT  Scotland
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how does one use webarchive?
I just googled and entered pm a1 and it came back "done" but showing a blank page.
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Old 17th August 2008, 10:37 AM   #8
PMA is offline PMA  Europe
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Hi,

yes, it was PM-A1. I still have that amplifier. The output stage works in class A up to some 35W/8 ohm and is located outside NFB loop. Today, I would replace the opamp VAS (AD797 + OPA445) by a discrete solution.

You can post the schematic, no problem, but I will probably have not much time to participate in the discussion.

Pavel
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Old 17th August 2008, 10:40 AM   #9
PMA is offline PMA  Europe
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4W/4ohm
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Old 17th August 2008, 12:20 PM   #10
h_a is offline h_a  Europe
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Thank you very much, Pavel!


Quote:
how does one use webarchive?
Enter the internet adress of the website you're interested in and hit the button...you get a list of versions of the website for different dates.

These you can surf just like the real website.

Don't know why, but sometimes images and what not are missing, in this case most schematics are gone

But not for all timestamps

Have fun, Hannes
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