Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

XCEN Balanced to Single-Ended Converter Revisited
XCEN Balanced to Single-Ended Converter Revisited
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 9th November 2018, 08:55 AM   #1
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
Default XCEN Balanced to Single-Ended Converter Revisited

I have a few unfinished projects over the years that I want to tidy up in 2018,
and the XCEN Balanced to Single-Ended Converter is one of them.
The XCEN -- Balanced to Single Ended Converter

In 2012, we started work on an all-JFET XCEN. AC performance was fine (-93dB THD), and it sounded great.
But I was not totally happy with the 50mV start-up DC offset, even though it went down to < 10mV after a few minutes.
The XCEN -- Balanced to Single Ended Converter

The revised circuit still uses 2SK246/2SJ103 or their SMD equivalent, but now Y-grade and at much lower bias.
And the current sources are now BJT based and self-tracking, as in our Pioneer Super Linear Headphone Amplifier circuit.
DC offset has been reduced to < 10mV at start up, and stable to +/2mV over 30 minutes.
And a final bonus is that distortion improves to -105dB H2, and -110dB H3 at 1Vrms 1kHz output.

You can read about the topology changes and their reasoning in the article.

Finally, I am remembering bcarso on this occasion with some sadness.
He inspired me on numerous occasions through interesting and open discussion, also at the XCEN 2012 thread,
but is sadly no longer with us.
RIP Brad Wood


Patrick

.
Attached Images
File Type: jpg 180629 XCEN 2018 PCB Btm.JPG (154.8 KB, 142 views)
Attached Files
File Type: pdf XCEN Description Public 181028.pdf (585.3 KB, 51 views)
__________________
xen-audio.com
  Reply With Quote
Old 9th November 2018, 09:21 AM   #2
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
Links to references :

1. The XCEN -- Balanced to Single Ended Converter - diyAudio

2. John Curl's Blowtorch preamplifier part II - Page 9814 - diyAudio

3. The Pioneer Super Linear Circuit - diyAudio


Patrick
__________________
xen-audio.com
  Reply With Quote
Old 9th November 2018, 01:34 PM   #3
bvtrinh is offline bvtrinh  United States
diyAudio Member
 
Join Date: Sep 2014
Hello Patrick,

I was wondering if you were planning on selling the boards or kits? Also, how about single ended to balanced ones?
  Reply With Quote
Old 9th November 2018, 03:05 PM   #4
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
> I was wondering if you were planning on selling the boards or kits?

Making PCBs available is relatively easy.
Important is that you can find 2SJ103Y or 2SJ106Y for group match.
2SK208Y is Mouser or DK active. So no problem with those.
If I have to supply matched 2SJ106s then it is a lot or work, and will take time.

> Also, how about single ended to balanced ones?

NECX and NESX Single-Ended to Balanced Converters


Patrick
__________________
xen-audio.com
  Reply With Quote

Reply


XCEN Balanced to Single-Ended Converter RevisitedHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Single ended to balanced conversion Corpius Analog Line Level 27 23rd February 2016 12:07 AM
The XCEN -- Balanced to Single Ended Converter EUVL Analog Line Level 117 19th March 2014 12:56 AM
Single Ended to balanced for F4 Joshua_G Pass Labs 10 24th April 2011 11:57 PM
How to add balanced input to single ended amp? jaistanley Class D 5 2nd December 2010 05:29 AM
Converting single ended amp to balanced boyelroy Solid State 15 10th November 2002 05:51 PM


New To Site? Need Help?

All times are GMT. The time now is 05:19 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki