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Old 21st July 2012, 07:23 PM   #11
EUVL is offline EUVL  Europe
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Can you post a link to a datasheet ?


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Old 21st July 2012, 08:03 PM   #12
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One improvement could be a CFP at the input instead of the lone Fets. That lowers Gm variations.
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Old 21st July 2012, 08:37 PM   #13
bcarso is offline bcarso  United States
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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
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Old 21st July 2012, 08:45 PM   #14
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There still is the problem with P-channels.
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Old 21st July 2012, 08:48 PM   #15
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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.
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File Type: jpg Single Ended Bal-Unbal.jpg (95.8 KB, 929 views)
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Old 21st July 2012, 09:39 PM   #16
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Interesting ! Hope I will have time to catch on with all the projects when my shipment will arrive.

Good job.

Davide
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Old 21st July 2012, 09:41 PM   #17
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Was time to change flag :-)

D.
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Old 22nd July 2012, 05:33 AM   #18
Calvin is offline Calvin  Germany
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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
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Old 22nd July 2012, 06:42 AM   #19
EUVL is offline EUVL  Europe
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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 ?


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Old 22nd July 2012, 07:50 AM   #20
EUVL is offline EUVL  Europe
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> 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


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