MOSFET power amp schematic

Leolabs · 20th November 2005, 01:18 AM

What's your recommendations,esp for use with the old 2SJ50/2SK135???

edl · 20th November 2005, 10:32 AM

Dear Laolabs,

A schema attached.
If you have any question about the schema, let's ask.

Regards

lilouxhk · 21st November 2005, 05:16 AM

How dose this amp sound? Any idea?
I want a 20w class A mosfet amp with this output pair; does it work or not?

thanks

djk · 21st November 2005, 10:58 AM

200W into 8 ohms.

http://img.photobucket.com/albums/v3...craftsmen2.jpg

johnnyx · 21st November 2005, 11:26 AM

Have a look in this thread. Take note of the issue with the 100 ohm gate stopper resistors, I had a problem with this that was described towards the end of the thread, increase them to 200 ohms or so. This also applies to the Exicon replacement devices;- same problem.

Leolabs · 21st November 2005, 01:54 PM

Thanks all for your replies.But I have build that with differential amp base input,which I believed taken from Hitachi's application notes.What I am looking for is kind that fully complementary,without differential amp,and yet simple enough with maybe 6 to 8 devices per channel,but definitelly not a single-ended one

Rick NL · 21st November 2005, 02:46 PM

Look at the Zenquito from mr Plantfeve at http://perso.wanadoo.fr/jm.plantefeve/sche.html
With one set of output devices and 2 x 18 VAC (2 x 25 VDC) it should be a perfect solution for your requirements.
Six devices total and about 25 Watt's in 8 Ohm.
Haven't build this one so I cannot say anything on how it sounds, but I have read good reviews.

Succes,

Rick

Rick NL · 21st November 2005, 03:14 PM

As a remark to my post I might say that with a 2 x 15 VAC (2x 21 VDC) the dissipation on a single output pair would be more at the safe side. Still around 16 Watts in 8 Ohm.

Rick

bear · 21st November 2005, 04:11 PM

Fully complementary?

DC coupled?

Borbely.

http://www.borbelyaudio.com

also articles published in TAA/Audio Express and in Euro publications too.

_-_-bear

PS. plus they sound and measure well too.

Leolabs · 22nd November 2005, 01:26 AM

Thanks Rick for the website

.Thanks Bear for the Borberly,but Borberly's circuits are quite complex,and I really dont want any differential amp input.

20th November 2005, 01:18 AM	#1
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	MOSFET power amp schematic What's your recommendations,esp for use with the old 2SJ50/2SK135???

21st November 2005, 05:16 AM	#3
lilouxhk diyAudio Member Join Date: Nov 2005 Location: hk	MOSFET power amp schematic How dose this amp sound? Any idea? I want a 20w class A mosfet amp with this output pair; does it work or not? thanks

21st November 2005, 02:46 PM	#7
Rick NL diyAudio Member Join Date: Sep 2003 Location: Gouda	Look at the Zenquito from mr Plantfeve at http://perso.wanadoo.fr/jm.plantefeve/sche.html With one set of output devices and 2 x 18 VAC (2 x 25 VDC) it should be a perfect solution for your requirements. Six devices total and about 25 Watt's in 8 Ohm. Haven't build this one so I cannot say anything on how it sounds, but I have read good reviews. Succes, Rick __________________ After all it's the music

21st November 2005, 03:14 PM	#8
Rick NL diyAudio Member Join Date: Sep 2003 Location: Gouda	As a remark to my post I might say that with a 2 x 15 VAC (2x 21 VDC) the dissipation on a single output pair would be more at the safe side. Still around 16 Watts in 8 Ohm. Rick __________________ After all it's the music

21st November 2005, 04:11 PM	#9
bear expert in tautology diyAudio Member Join Date: Apr 2002 Location: New York State USA	Fully complementary? DC coupled? Borbely. http://www.borbelyaudio.com also articles published in TAA/Audio Express and in Euro publications too. _-_-bear PS. plus they sound and measure well too. __________________ _-_-bear http://www.bearlabs.com [...2SJ74 Toshiba bogus asian parts - beware! ] -- Btw, I don't actually know anything, FYI --


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21st November 2005, 10:58 AM	#4
djk diyAudio Member Join Date: Feb 2001 Location: USA	200W into 8 ohms. http://img.photobucket.com/albums/v3...craftsmen2.jpg

21st November 2005, 11:26 AM	#5
johnnyx diyAudio Member Join Date: Jan 2004 Location: manchester	Have a look in this thread. Take note of the issue with the 100 ohm gate stopper resistors, I had a problem with this that was described towards the end of the thread, increase them to 200 ohms or so. This also applies to the Exicon replacement devices;- same problem.

21st November 2005, 01:54 PM	#6
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Thanks all for your replies.But I have build that with differential amp base input,which I believed taken from Hitachi's application notes.What I am looking for is kind that fully complementary,without differential amp,and yet simple enough with maybe 6 to 8 devices per channel,but definitelly not a single-ended one

22nd November 2005, 01:26 AM	#10
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Thanks Rick for the website .Thanks Bear for the Borberly,but Borberly's circuits are quite complex,and I really dont want any differential amp input.

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