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Old 16th September 2011, 04:16 PM   #1
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Default 500W 2sk135, 2sj50 amplifier

I like to try this circuits. Is there anyone try it before ? Click the image to open in full size.
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Old 17th September 2011, 04:37 AM   #2
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I have just completed my ETI TA-477 project. Sound good so I want to try another one using same MOSFET

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Old 17th September 2011, 06:32 AM   #3
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Dude this schematic is from famous audio amplifier book in Bulgaria.
Outputs are old LMOS devices (the book is from 70's or 80's) that is impossible to be found original but can be substituted with modern ones. You should know that LMOS devices are expensive and you can't use VMOS like IRFP240/9240. You can use 2SK1058/2SJ162 for substitutes and here is a example price: 99

For the schematic performance it is better to ask in bulgarian forums because possibility someone to be built it in the past is much bigger. I saw an opinion in a thread for MOSFET amps for the current schematic and it was positive one.

Good Luck!
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Old 17th September 2011, 06:41 AM   #4
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hi, Astankov

Thanks for your reply. I will search the web as you have suggested and see if I can get further information for the circuit. I still got enough 2sk135 and 2sj50 for making two monoblocks that why I am interested on this circuit.

anyway, thanks again

Ciao

Leung
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Old 17th September 2011, 06:46 AM   #5
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Quote:
Originally Posted by wcleungoo View Post
I like to try this circuits. Is there anyone try it before ? Click the image to open in full size.
Yes, a lot of readers of the Elektor magazine ...
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Old 17th September 2011, 06:48 AM   #6
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Quote:
Originally Posted by astankov View Post
Dude this schematic is from famous audio amplifier book in Bulgaria.
IP
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Old 17th September 2011, 07:14 AM   #7
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Quote:
Originally Posted by Lazy Cat View Post
IP
Well it originates from the magazine but it is published also in the book like a part of a complete system with power supply , preamp , equalizer , power amp (current schematic) , and DC protection for the speakers. This book does not pretend for authority of the schematic it is just published and explained for less experienced DIYers with example PCB and places of elements. This book was very popular not long ago and I have it too.

Last edited by astankov; 17th September 2011 at 07:24 AM.
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Old 17th September 2011, 07:31 AM   #8
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Thanks for the information.... I have some background of the amplifier circuit. BTW.. is there any name given to the amplifier / circuit so that I can search in the internet for more info.


Cheers

WC
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Old 17th September 2011, 08:25 AM   #9
NMOS is offline NMOS  Germany
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Quote:
Originally Posted by wcleungoo View Post
Thanks for the information.... I have some background of the amplifier circuit. BTW.. is there any name given to the amplifier / circuit so that I can search in the internet for more info.


Cheers

WC

Hi Guys

nice to see its working ...but its not worth to spend time for LMOS
I remember this circuit was not stable working against oscillations and has a lot of heat dissipation like Sony TAN 8550.... running hot you can cook eggs

here in diyaudio are very good sounding stable working mosfet schematics using VMOS Devices N-Channel

cheap to build, reliable open design to huild 200 up to 1,5 KW output power
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Old 17th September 2011, 08:26 AM   #10
Salas is offline Salas  Greece
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wcleungoo: ''I found these from the internet... seems that it is extract from a book with relatively "thin" paper. Is there any name given to this amp?''

Please don't post publications scans, we don't know the copyright status. Thanks.
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