500W 2sk135, 2sj50 amplifier

wcleungoo · 16th September 2011, 04:16 PM

I like to try this circuits. Is there anyone try it before ?

wcleungoo · 17th September 2011, 04:37 AM

I have just completed my ETI TA-477 project. Sound good so I want to try another one using same MOSFET

astankov · 17th September 2011, 06:32 AM

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: ÊÀÖÀÐÑÊÈ 99 ÎÎÄ

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!

wcleungoo · 17th September 2011, 06:41 AM

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

Lazy Cat · 17th September 2011, 06:46 AM

Quote:

Originally Posted by wcleungoo

I like to try this circuits. Is there anyone try it before ?

Yes, a lot of readers of the Elektor magazine ...

Lazy Cat · 17th September 2011, 06:48 AM

Quote:

Originally Posted by astankov

Dude this schematic is from famous audio amplifier book in Bulgaria.

IP

astankov · 07:24 AM

Quote:

Originally Posted by Lazy Cat

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.

wcleungoo · 17th September 2011, 07:31 AM

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

NMOS · 17th September 2011, 08:25 AM

Quote:

Originally Posted by wcleungoo

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

Salas · 17th September 2011, 08:26 AM

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.

16th September 2011, 04:16 PM	#1
wcleungoo diyAudio Member Join Date: Jun 2010	500W 2sk135, 2sj50 amplifier I like to try this circuits. Is there anyone try it before ?

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17th September 2011, 04:37 AM	#2
wcleungoo diyAudio Member Join Date: Jun 2010	I have just completed my ETI TA-477 project. Sound good so I want to try another one using same MOSFET

17th September 2011, 06:32 AM	#3
astankov diyAudio Member Join Date: Dec 2009 Location: Pernik	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: ÊÀÖÀÐÑÊÈ 99 ÎÎÄ 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!

17th September 2011, 06:41 AM	#4
wcleungoo diyAudio Member Join Date: Jun 2010	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

17th September 2011, 07:31 AM	#8
wcleungoo diyAudio Member Join Date: Jun 2010	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

17th September 2011, 08:26 AM	#10
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	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.