FS: PreAmp with Complimentary JFET Diff input & JFET ouput - diyAudio
Go Back   Home > Forums > Commercial Sector > Vendor Forums > Vendor's Bazaar

Vendor's Bazaar Commercial Vendors large & small hawking their wares

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 15th June 2011, 02:09 AM   #1
diyAudio Member
 
Join Date: Mar 2011
Location: East Coast
Default FS: PreAmp with Complimentary JFET Diff input & JFET ouput

Hi folks,

I recently built a preamp with complimentary JFET input pairs and JFET output stages.
It produces very low distortion and renders an elegant and sophisticated sound typical of JFETs.
The project started with MicroCap simulation and was perfected with elaborate tweaking.

Click the image to open in full size.
63308-C sch.pdf

PCB layout was done with Eagle 11.

Click the image to open in full size.
63308-C pcb.pdf

Item will soon be available.

Regards,
US Audio Circuits
  Reply With Quote
Old 15th June 2011, 03:54 AM   #2
askii2 is offline askii2  India
diyAudio Member
 
Join Date: May 2011
Location: Pune
usacircuits.com appears to have been suspended for some reason.
  Reply With Quote
Old 15th June 2011, 04:23 AM   #3
diyAudio Member
 
Join Date: Mar 2011
Location: East Coast
My website was attacked by hacker the other day.

The webmaster has contacted the web hosting company.

Hope it will be fixed in a few days.

Thanks,
US Audio Circuits
  Reply With Quote
Old 15th June 2011, 12:29 PM   #4
diyAudio Member
 
Join Date: Mar 2011
Location: East Coast
Correction :

The PCB layout software should be Eagle 5 v11.

Regards,
US Audio Circuits
  Reply With Quote
Old 15th June 2011, 12:46 PM   #5
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
I'm moving this over to Vendors' since it is clearly a commercial offering.
__________________
You might be screaming "No, no, no" and all they hear is "Who wants cake?" Let me tell you something: They all do. They all want cake.- Wilford Brimley
  Reply With Quote
Old 15th June 2011, 12:50 PM   #6
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
Pure coincidence, no doubt !!

I hope Erno will forgive me in this particular case for uploading his schematics, which was published at his website.


Patrick


(copyrighted drawing removed by moderators)
  Reply With Quote
Old 15th June 2011, 01:36 PM   #7
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Great City of Turnhout, Belgium
Blog Entries: 7
Quote:
Originally Posted by USAcircuits View Post
Hi folks,

I recently built a preamp with complimentary JFET input pairs and JFET output stages.
It produces very low distortion and renders an elegant and sophisticated sound typical of JFETs.
The project started with MicroCap simulation and was perfected with elaborate tweaking.

Regards,
US Audio Circuits
Can you show us some sim results please?

jan didden
__________________
I won't make the tactical error to try to dislodge with rational arguments a conviction that is beyond reason - Daniel Dennett
Check out Linear Audio Vol 7!
  Reply With Quote
Old 15th June 2011, 04:31 PM   #8
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
Quote:
Originally Posted by EUVL View Post
Pure coincidence, no doubt !!

I hope Erno will forgive me in this particular case for uploading his schematics, which was published at his website.


Patrick
I've never seen this design, and I arrived at something very, very similar quite independently a very long time ago. I would proceed cautiously with this allegation. Everything I see here is prior art, and the proposed design actually differs in several key respects - I'll leave that to you to figure out.
__________________
"Extraordinary claims require extraordinary evidence." - Carl Sagan
  Reply With Quote
Old 15th June 2011, 05:11 PM   #9
diyAudio Member
 
Join Date: Nov 2009
Location: Kraków
I have built I/V and LineAmplifier full cascoded versions with small changes to the circuits allowing of extra cascode biasings in case proper devices are not found. So far I was able to startup I/V in passive mode. Because of the reasons above I will not post a detailed circuits but can post schematics without a values, and simulation results if anyone is interested.
  Reply With Quote
Old 15th June 2011, 08:19 PM   #10
diyAudio Member
 
Join Date: Mar 2011
Location: East Coast
Janneman,

The final MicroCap simulation shows the following result :

63308-C 1KHz.jpg

Regards,
US Audio Circuits
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
FS: JFET Dual Diff. DIY Stereo Preamp Bengali Swap Meet 0 28th August 2009 05:29 PM
Can I use the 2N5484 jfet diff pair in an audio amplifier front end? carpenter Pass Labs 27 28th March 2009 12:55 AM
Mastroianni Single JFET Input Preamp lineup Solid State 18 4th June 2007 06:46 AM
Complementary diff input with JFET and BJT cascode Bensen Solid State 126 16th October 2006 05:35 PM


New To Site? Need Help?

All times are GMT. The time now is 09:55 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2