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Old 20th March 2008, 08:11 AM   #1
MadFinn is offline MadFinn  Sweden
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Join Date: Jan 2006
Location: Småland
Default PA03 Or Pavel Dudek gainclone

Hello
Me and my friend are building these amps from the groupbuy last year.
Almost done with the first chanel and have some questions.
If you look at tha attached file we wonder is this correct way to connect signal, transformer and loudspeaker ???
We are newbies in the diy building
We don't understand the instructions in the buildin guide

Please help us to finnish these amps.
Attached Images
File Type: jpg pa 03 signal bryggad1.jpg (51.5 KB, 1541 views)
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Old 20th March 2008, 09:16 AM   #2
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Join Date: Aug 2003
Location: Prague,Czech Republic
If you can to use bridge configuration, speaker termination is correct. Wrong is at your pic connection of transformer - correct is 0 - 35 - 35 - 0 connection. Try to ask Per- Anders, I hope he will explain it to you...
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Old 20th March 2008, 10:15 AM   #3
MadFinn is offline MadFinn  Sweden
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Join Date: Jan 2006
Location: Småland
Default Great

Thanxs for your answer.
Yes we will use the bridged configuration on our amps.
So i guess that the signal is correct and now we know how to connect speaker and transformer also
Thanxs again for your answer
MadFinn
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Old 4th April 2009, 11:02 PM   #4
SA-12 is offline SA-12  Canada
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Can anyone provide a link to the build instructions for this project, I have the boards and parts but no instruction lol
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Old 26th April 2009, 10:49 AM   #5
agent.5 is offline agent.5  United States
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Join Date: Aug 2003
Location: San Francisco, CA
Quote:
Originally posted by SA-12
Can anyone provide a link to the build instructions for this project, I have the boards and parts but no instruction lol

Does anyone has the schematic of PA03? I ordered the boards and parts and didn't download the schematic.
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Old 14th April 2011, 01:37 AM   #6
BNK is offline BNK
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Join Date: Mar 2007
Everything is here.
Attached Files
File Type: zip PA03_instr_manual.zip (686.7 KB, 498 views)

Last edited by BNK; 14th April 2011 at 01:51 AM.
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Old 8th December 2015, 08:33 AM   #7
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
It's a long time since I looked at Pavel's design.

I see now that he has incorporated the Pi version of the Thiele Output Network.

I wonder if this amp was my first sighting of this arrangement?
In the meantime I had forgotten about it and some/mamy years later it has become my recommended method of loading the amplifier at HF.

I note also that he uses 0r1 resistive load before the output. This may well be why the amplifier does not adversly respond to reactive loading.

There are a few other clever tweaks in there and overall, I see only good in this chipamp implementation.
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