JFET/MOSFET complementary-differential preamplifier

PMA · 26th January 2011, 09:50 AM

I have a new JFET/MOSFET complementary-differential preamplifier, please visit

PRE complementary-differential preamplifier

and see the attached images.

Bonsai · 27th January 2011, 07:28 AM

Looks very nice PMA - simple and elegant!

PMA · 27th January 2011, 07:51 AM

Thanks, Bonsai. And sounds good

gk7 · 27th January 2011, 07:52 AM

Yes simple and elegant (and good sounding), and important to mention IMHO: It´s actually a John Curl design.

PMA · 27th January 2011, 07:58 AM

It might be Erno Borbely as well, and others

Workhorse · 08:17 AM

I like it

PMA · 27th January 2011, 08:22 AM

R1 and R2 values have to be selected according to Idss of the matched JFETs. But the task is not very difficult, and digital multimeter is enough to make it.

chlorofille · 27th January 2011, 08:52 AM

Pavel,

How does this differ sonically to the Dispre 2 jfet ?

PMA · 27th January 2011, 09:04 AM

Hi chlorofille,

yes, it sounds a bit different, and I would guess that listener's taste would judge.

Regards,

kannan_s · 27th January 2011, 12:33 PM

Hi PMA
I expected a small Power amp based on this topology as we see many pre amps are around. Probably you would be the one to come with some DIY design ?
thanks for bringing out JC' s ideas
Kannan

27th January 2011, 07:28 AM	#2
Bonsai diyAudio Member Join Date: Aug 2006 Location: Taipei, Taiwan	Looks very nice PMA - simple and elegant! __________________ bonsai Amplifier Design and Construction for MUSIC! http://hifisonix.com/

27th January 2011, 07:51 AM	#3
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	Thanks, Bonsai. And sounds good __________________ Pavel Macura http://www.linkedin.com/pub/pavel-macura/4/783/637 http://web.telecom.cz/macura/audiopage.html

27th January 2011, 07:52 AM	#4
gk7 diyAudio Member Join Date: Oct 2007 Location: Vienna / Austria	Yes simple and elegant (and good sounding), and important to mention IMHO: It´s actually a John Curl design. __________________ Regards, Georg

27th January 2011, 07:58 AM	#5
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	It might be Erno Borbely as well, and others __________________ Pavel Macura http://www.linkedin.com/pub/pavel-macura/4/783/637 http://web.telecom.cz/macura/audiopage.html

27th January 2011, 08:14 AM	#6
Workhorse diyAudio Member Join Date: Dec 2004	I like it __________________ It's a fruitless endeavor to try and educate a fool that rejoices in ignorance Last edited by Workhorse; 27th January 2011 at 08:17 AM.


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27th January 2011, 08:22 AM	#7
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	R1 and R2 values have to be selected according to Idss of the matched JFETs. But the task is not very difficult, and digital multimeter is enough to make it. __________________ Pavel Macura http://www.linkedin.com/pub/pavel-macura/4/783/637 http://web.telecom.cz/macura/audiopage.html

27th January 2011, 08:52 AM	#8
chlorofille diyAudio Member Join Date: Jul 2008 Location: Christchurch	Pavel, How does this differ sonically to the Dispre 2 jfet ? __________________ Sand till the end of time

27th January 2011, 09:04 AM	#9
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	Hi chlorofille, yes, it sounds a bit different, and I would guess that listener's taste would judge. Regards, __________________ Pavel Macura http://www.linkedin.com/pub/pavel-macura/4/783/637 http://web.telecom.cz/macura/audiopage.html

27th January 2011, 12:33 PM	#10
kannan_s diyAudio Member Join Date: Jun 2009	Hi PMA I expected a small Power amp based on this topology as we see many pre amps are around. Probably you would be the one to come with some DIY design ? thanks for bringing out JC' s ideas Kannan

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