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Old 4th October 2009, 02:27 AM   #51
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Default Not having published schematics with the correct values

we can redesign, or recalculate..using only the amplifier basic frame and extructure.

As we have operational amplifiers, and they work with 12 volts, the input can be tested using AC127 and AC128 (germanium)...ahahahahahah!

And we can use 12 volts simetrical to the differential, this way we gonna have 12 volts simetrical to the operational amplifier..and there we can place a very famous one..the ua741...eheheheheh

To drivers we can try AD140, ASZ18 and some others... 2SB477 may help too.

Well... redesign is good, because if it result sounding fine,... then was because i have redesign it good...for good...and if it resulted bad, was because your schematic was defective.

ahahahahahah!

better to post schematic dear Epupa.... with the "guaranteed" values printed on it... so, your standards of quality will be protected against "good" design solutions.

Beautifull your amplifier, was very appreciated by me..and because of that, now i want to make it even better, as i have no schematic, then i can make it new!

Carlos
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File Type: jpg AC127.jpg (33.8 KB, 1680 views)
File Type: jpg AD149.jpg (46.5 KB, 1669 views)
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Last edited by destroyer X; 4th October 2009 at 02:31 AM.
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Old 4th October 2009, 10:50 AM   #52
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I suggest to put also a "speaker line" , to make the entire project more appealing , like "wouldn't a superb amplifier deserve a splendid companion etc etc." !?
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Old 4th October 2009, 05:02 PM   #53
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Quote:
Originally Posted by destroyer X View Post
they do not like to share
Carlos,

Pavel Dudek has been publishing in Czech magazines ages before the art of online scavenging started.
Schematics of a few of his amp designs were printed in magazines overhere even long before the diyA forum surfaced.
You can easily find the details on the DPA222 yourself (+ board layer files), there's no need for Pavel to post that stuff again and again himself.
You're also forgetting that there's been a thread dedicated to the "leading" Duce designs for the last 5 years :
Pavel Dudek's (Upupa Epops) amplifiers

The MKII update of the 222 looks a bit more assemble friendly, such as BF469/470 instead of Upupa's favorite but hard to get Sanyo A1540/C3955, just the C1-C4 thing on the boards escapes me.
There's been a group buy of the 222MKII hardware parts at the Czech audio forum a couple of years ago, both for the SS stuff as the goldy lock screws.

Edit : Oopsie, make that BF471/472 instead of 469/470.

Last edited by jacco vermeulen; 4th October 2009 at 05:13 PM.
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Old 4th October 2009, 06:37 PM   #54
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Thanks Jacco for explanation for Carlos... Only one little notice: BF469-472 are out of program, but they can be replaced by other similar ( video ) types...
These stated amps was designed in the year 96, so they are relatively old. Past good experiences with them ( mosfet ones ), next step was design of little bit more powerful model, called TYA I ( Ten Years After ), because it was ten years later from my published serial at Amaterske Radio ( Cz journal for DIY )...here are the photos and this is for now all...
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Old 4th October 2009, 06:39 PM   #55
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Nearer look...
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Old 4th October 2009, 06:40 PM   #56
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Old 4th October 2009, 06:44 PM   #57
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Old 4th October 2009, 07:21 PM   #58
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Quote:
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....
Those speaker connections, are they custom made?
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Old 4th October 2009, 10:06 PM   #59
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Quote:
Originally Posted by syn08 View Post
a complete schematic
Mr Popa,

P-A forgot to mention that he's still hosting some of Upupa's files :
http://sjostromaudio.com/dudek_files
There's a dedicated thread on the Duce power amp 222 at forum.audioweb.cz, all files easy to download without a forum membership.
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Old 4th October 2009, 10:47 PM   #60
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Quote:
Originally Posted by jacco vermeulen View Post
Mr Popa,

P-A forgot to mention that he's still hosting some of Upupa's files :
http://sjostromaudio.com/dudek_files
There's a dedicated thread on the Duce power amp 222 at forum.audioweb.cz, all files easy to download without a forum membership.
Thank you, meantime Pavel offered to send me the full information in private. It's great that this information is available for everybody, hope Pavel wouldn't mind about.
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