The XCEN -- Balanced to Single Ended Converter - Page 2

EUVL · 21st July 2012, 07:23 PM

Can you post a link to a datasheet ?

Patrick

Joachim Gerhard · 21st July 2012, 08:03 PM

One improvement could be a CFP at the input instead of the lone Fets. That lowers Gm variations.

bcarso · 08:40 PM

2N4391 -92, -93 and their plastic equivalents PN4391 etc., J111, 112, 113 I believe, also SM MMBF4391. See for example http://www.fairchildsemi.com/ds/MM/MMBF4391.pdf.

I like the 2N part because it can be used a fairly high dissipations when in a heatsink, some of which have a threaded stud and an insulating disc (the gate is common to the case). A few people still make them and someone found some in surplus recently.

Here's some data with typical curves: http://www.fairchildsemi.com/ds/J1/J112.pdf

Joachim Gerhard · 21st July 2012, 08:45 PM

There still is the problem with P-channels.

Joachim Gerhard · 21st July 2012, 08:48 PM

Funny enough here is a single ended Bal-Unbal converter. That also has the CFP i am talking about, just made parallel symmetric as we do here.

Nikon1975 · 21st July 2012, 09:39 PM

Interesting ! Hope I will have time to catch on with all the projects when my shipment will arrive.

Good job.

Davide

Nikon1975 · 21st July 2012, 09:41 PM

Was time to change flag :-)

D.

Calvin · 22nd July 2012, 05:33 AM

Hi,

the 4391 makes a nice cascode to BF862 and SK170/389 in a ccs-loaded sourcefollower buffer with considerably better performance than a simple ccs-loaded follower alone.

jauu
Calvin

EUVL · 22nd July 2012, 06:42 AM

We had something like that here, but used J111 or J310 as cascode.
The reason that I prefer J111 is that there is a P-counterpart, namely J174.

Anybody using the new ESS Vout DAC (ES9022)?
http://www.diyaudio.com/forums/attac...c.tsc-tina.pdf

But I would be interested in a 2Nxxxx part as an alternative to 2SK246/2SJ103.
Any suggestions for a good, truly complementary pair ?

Patrick

EUVL · 22nd July 2012, 07:50 AM

> Of course if you make it symmetric after the input Jfets it will also convert
single-ended to balanced.

Nelson, how about this one ?

http://www.diyaudio.com/forums/attac...-paraphase.jpg

Patrick

21st July 2012, 07:23 PM	#11
EUVL diyAudio Member Join Date: Oct 2003	Can you post a link to a datasheet ? Patrick __________________ xen-audio.com

21st July 2012, 08:37 PM	#13
bcarso diyAudio Member Join Date: May 2005 Location: Canoga Park, California	2N4391 -92, -93 and their plastic equivalents PN4391 etc., J111, 112, 113 I believe, also SM MMBF4391. See for example http://www.fairchildsemi.com/ds/MM/MMBF4391.pdf. I like the 2N part because it can be used a fairly high dissipations when in a heatsink, some of which have a threaded stud and an insulating disc (the gate is common to the case). A few people still make them and someone found some in surplus recently. Here's some data with typical curves: http://www.fairchildsemi.com/ds/J1/J112.pdf Last edited by bcarso; 21st July 2012 at 08:40 PM. Reason: more data

22nd July 2012, 05:33 AM	#18
Calvin diyAudio Member Join Date: Nov 2004 Location: close to Basel	Hi, the 4391 makes a nice cascode to BF862 and SK170/389 in a ccs-loaded sourcefollower buffer with considerably better performance than a simple ccs-loaded follower alone. jauu Calvin __________________ http://calvins-audio-page.jimdo.com

22nd July 2012, 06:42 AM	#19
EUVL diyAudio Member Join Date: Oct 2003	We had something like that here, but used J111 or J310 as cascode. The reason that I prefer J111 is that there is a P-counterpart, namely J174. Anybody using the new ESS Vout DAC (ES9022)? http://www.diyaudio.com/forums/attac...c.tsc-tina.pdf But I would be interested in a 2Nxxxx part as an alternative to 2SK246/2SJ103. Any suggestions for a good, truly complementary pair ? Patrick __________________ xen-audio.com

22nd July 2012, 07:50 AM	#20
EUVL diyAudio Member Join Date: Oct 2003	> Of course if you make it symmetric after the input Jfets it will also convert single-ended to balanced. Nelson, how about this one ? http://www.diyaudio.com/forums/attac...-paraphase.jpg Patrick __________________ xen-audio.com


	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

21st July 2012, 08:03 PM	#12
Joachim Gerhard diyAudio Member Join Date: Mar 2009	One improvement could be a CFP at the input instead of the lone Fets. That lowers Gm variations.

21st July 2012, 08:45 PM	#14
Joachim Gerhard diyAudio Member Join Date: Mar 2009	There still is the problem with P-channels.

21st July 2012, 09:39 PM	#16
Nikon1975 diyAudio Member Join Date: Nov 2009 Location: Vienna	Interesting ! Hope I will have time to catch on with all the projects when my shipment will arrive. Good job. Davide

21st July 2012, 09:41 PM	#17
Nikon1975 diyAudio Member Join Date: Nov 2009 Location: Vienna	Was time to change flag :-) D.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Single Ended to balanced for F4	Joshua_G	Pass Labs	10	24th April 2011 10:57 PM
How to add balanced input to single ended amp?	jaistanley	Class D	5	2nd December 2010 04:29 AM
Single-ended input to balanced output, no DC offset	LineSource	Solid State	16	19th October 2005 09:32 PM
Converting single ended amp to balanced	boyelroy	Solid State	15	10th November 2002 04:51 PM
Does it Make Sense? Balanced to Single Ended	Super_BQ	Pass Labs	3	3rd October 2002 09:01 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read