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Old 20th November 2005, 01:18 AM   #1
Leolabs is offline Leolabs  Malaysia
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Question MOSFET power amp schematic

What's your recommendations,esp for use with the old 2SJ50/2SK135???
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Old 20th November 2005, 10:32 AM   #2
edl is offline edl  Hungary
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Dear Laolabs,

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

Regards
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File Type: gif mosfet.gif (9.9 KB, 1824 views)
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Old 21st November 2005, 05:16 AM   #3
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Default 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
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Old 21st November 2005, 10:58 AM   #4
djk is offline djk
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200W into 8 ohms.

http://img.photobucket.com/albums/v3...craftsmen2.jpg
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Old 21st November 2005, 11:26 AM   #5
johnnyx is offline johnnyx  United Kingdom
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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.
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Old 21st November 2005, 01:54 PM   #6
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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
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Old 21st November 2005, 02:46 PM   #7
Rick NL is offline Rick NL  Netherlands
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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
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Old 21st November 2005, 03:14 PM   #8
Rick NL is offline Rick NL  Netherlands
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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.

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Old 21st November 2005, 04:11 PM   #9
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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.
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Old 22nd November 2005, 01:26 AM   #10
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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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