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Old 16th November 2008, 02:31 PM   #41
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'....If you want to read Douglas Self article you may try this link:
http://paid4share.net/download.php?id=4341
Somebody is sharing, currently it works ... but nobody can know for how long ...
...."

The link doesn't work anymore !
Lineup can you email me a copy of the file ?
Thanks.
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Old 16th November 2008, 05:42 PM   #42
Tyimo is offline Tyimo  Hungary
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Hi Lineup brother!

Quote:
Tyimo is great guy. We have discussed a lot. But looks he is not so often around this forum now.
Thanks a lot for the kind words!
I every day read the forum, but I didn't post too much, because I am busy to learn some tube and transformer theorys.

Gaborbela is my DIY friends and He built and tested a lot of amplifiers and I know His audio taste and I believe in His oppinions.

I also know that Canopus amp and it is realy a boring amp.
The first circuit He posted looks promising, but I am not a big fun of Class AB and complementer PP transistor circuits. I am an inductor maniac guy.
Yes, I promised Him to design and make the PCB in the next month, but I think someone will overtake me. Maybe you!?!

Greets:
Tyimo
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Old 16th November 2008, 06:00 PM   #43
ferencz is offline ferencz  Hungary
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Quote:
Originally posted by anatech
Hi ferencz,
Was that Japanese schematic a commercial design? If so, who was it made by?
Thank you very much BTW.

Hi gaborbela,
The Japanese design actually looks pretty good. Those signal transistors they used are very good (classics in high end) and still available from vendors.

This little amp might make a very nice nice project. A board design would be a nice start. If the PCB is designed for normal transistors, you can still use darlingtons by shorting the E-B pads on the extra part. One board then does all. For 56V use, two outputs should be used.

Darlington transistors normally don't work as well as single parts. If the current through the driver isn't high enough, then it will not work well.

-Chris

Hi Chris,

The schematic has been scanned from an old japanese DIY-magazine. Sry, I cannot recall the magazine's name, it was long before...
As far as I know it was never been produced commercially.
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Old 16th November 2008, 11:18 PM   #44
lineup is offline lineup  Sweden
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Quote:
Originally posted by ashok
'....If you want to read Douglas Self article you may try this link:

The link doesn't work anymore! Lineup can you email me a copy of the file ?
Thanks.
Douglas Self share some knowledge, ideas on Muting Relays
and also several of his other Articles on things in Audio.

I suspected that was only one 'temporary link' made for me.
If you try one of these, you may have better luck. File is ~ 8 MB size.
link1
link2
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Old 17th November 2008, 09:18 AM   #45
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A friend of mine build this a couple of years back and he was happy with the results. Said he found schematics somewhere on the web. Based on similar topology.
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File Type: jpg 80w_2sc3858_2sa1494.jpg (69.5 KB, 1173 views)
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Old 17th November 2008, 09:48 AM   #46
lineup is offline lineup  Sweden
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Here is where you can find this schematic
.... and many others
Quote:
# Da 50 a 100 Watt

* 60W IRF530 part1 part2
* 65W TIP142 147
* 70W TIP35C 36C
* 70W MOS 2SK135 2SJ50
* 75W MOS MonacorPMA100
* 80W 2SC3858 2SA1494
http://www.audiofanatic.it/Schemi/Ti..._finaliSS.html
http://www.audiofanatic.it/Schemi/Ti..._finaliSS.html
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Old 17th November 2008, 03:14 PM   #47
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Hello
Thank for you research line up !
There are some similarity some of those schematics and what I originally posted in the first post .
But because I know the amp I posted at the beginning I would like to build exactly one more time after the same schematic . Probably with better passive components (resistors , capacitors , wiring etc)
For two reason I would like to stick to that amp I know the sound of that amplifier and I was happy with .Unfortunately as a greenhorn at that time I didn't gave enough appreciation (respect) to the great sound of the amp.
I thought naively if at the first try I achieved such a great sound the let try to improve it .
I was wrong , I tried to improve the active parts and I destroyed the PC board .It was not bigger than the size of a 10x10 cm if not smaller . It used on only 1/4W resistors on it only the emitter resistors were 5W and one on the output 2W . First build was with one set power transistors after the original schematic !
The second think there are many movies how they star the movie the same way they finish it .
I found many great sounding amplifiers over these years , so I think time to me to do the same as in those movies .
In a simple sentence to finish my DIY activity were I started .
We some of us we need to learn to be satisfied with some good sounding amplifier and to settle down and enjoy the music .
That is all about or not ?!
Of course I'm not totally retire from the DIY hobby but I want spend more time enjoy listening to the music .
Greetings
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Old 17th November 2008, 03:58 PM   #48
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Quote:
Originally posted by homemodder
A friend of mine build this a couple of years back and he was happy with the results. Said he found schematics somewhere on the web. Based on similar topology.
That's a pretty clever connection of the DC servo
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Old 17th November 2008, 06:52 PM   #49
lineup is offline lineup  Sweden
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Quote:
Originally posted by gaborbela

But because I know the amp I posted at the beginning I would like to build exactly one more time after the same schematic . Probably with better passive components (resistors , capacitors , wiring etc)

For two reason I would like to stick to that amp

I know the sound of that amplifier and I was happy with .Unfortunately as a greenhorn at that time I didn't gave enough appreciation (respect) to the great sound of the amp.
........
First build was with one set power transistors after the original schematic !

The second think there are many movies how they star the movie the same way they finish it .
I found many great sounding amplifiers over these years , so I think time to me to do the same as in those movies .
In a simple sentence to finish my DIY activity were I started .
We some of us we need to learn to be satisfied with some good sounding amplifier and to settle down and enjoy the music
Of course, gabor.
This is what you should do!
Make a new version from the Original Schematic.
You have no reason to change much .. maybe a few 'better' components/details to try.

All these other versions
is for other people reading this topic, today and next year ...
They may want to try to make something like 'your' amplifier.
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Old 17th November 2008, 07:40 PM   #50
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Concerning Gabor's original circuit, is there anything super-critical to a proper pcb layout for it?

How about a substitute for the darlington, any progress there?
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