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What To Do With Those 2SJ28's
What To Do With Those 2SJ28's
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Old 25th April 2017, 07:08 PM   #11
Nelson Pass is offline Nelson Pass  United States
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What To Do With Those 2SJ28's
I would imagine that they would make a nice DEF amp if you could find
an N ch device with a high enough Vgs voltage.

The 6 to 12 V Vgs figures do make for convenient cascodes.

The last generation of Sony amplifiers used SITs to cascode bipolar devices.
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Old 25th April 2017, 07:09 PM   #12
Michael Rothacher is offline Michael Rothacher  United States
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What To Do With Those 2SJ28's
Quote:
Originally Posted by Osvaldo de Banfield View Post
To call the mods attention, hit the red triangle at the left of the screen, then ask them to make the change.
Ah, thank you. Just saw your post.
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Old 25th April 2017, 07:34 PM   #13
BesPav is offline BesPav  Russian Federation
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Originally Posted by Michael Rothacher View Post
ideas to put them to use

Take IRFP140/240 as cascode devices and place them like this:
Click the image to open in full size.

Then take any opamp and place it in front of that cascode.

Provide enough or even excessive current and enjoy.
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Old 25th April 2017, 07:37 PM   #14
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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BesPau, you draw NJFETs, the guy has PJFET's. 2SJ's are PJFET's. 2SK's are N.
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Last edited by Osvaldo de Banfield; 25th April 2017 at 07:41 PM.
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Old 25th April 2017, 07:47 PM   #15
Mooly is offline Mooly  United Kingdom
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What To Do With Those 2SJ28's
Quote:
Originally Posted by Michael Rothacher View Post
Aw geez, I meant 2SJ28's. That's embarrassing, now my thread has a very misleading title


Mended now
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Old 25th April 2017, 07:47 PM   #16
BesPav is offline BesPav  Russian Federation
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Quote:
Originally Posted by Osvaldo de Banfield View Post
BesPau, you draw NJFETs, the guy has PJFET's. 2SJ's are PJFET's. 2SK's are N.


Oh, you are clearly right, sorry, i must check datasheet.
Than just pick IRFP9140/9240 and reverse polarity...
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Old 25th April 2017, 08:03 PM   #17
Soundhappy is online now Soundhappy  France
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What To Do With Those 2SJ28's
Quote:
Originally Posted by Michael Rothacher View Post
I'll post a couple of sketches to kick it off when I get in front of my computer.

Title changed! Thanks, Soundhappy.

Oops, it looks like the title changes, but not the actual thread title. Bad Mike
Oops is my bad sorry because is only first post title not thread title correction option

Question: Could autoformer connected gain stage like in M2 or similar with adaptations can play together with v-fet 2SJ28 DEF ?
Moderate price Edcors transformers or Jensens are cool irons.
Not classic Toshiba jfet's front end this time rater make them with small signal sit's 2SK79 ?
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Old 25th April 2017, 08:10 PM   #18
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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Thanks to Karl (Mooly), always very attentive.

Don't worry, all we are human, and make mistakes. Are we human?
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Old 25th April 2017, 08:21 PM   #19
Michael Rothacher is offline Michael Rothacher  United States
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What To Do With Those 2SJ28's
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Originally Posted by Mooly View Post


Mended now
Thank you, kind sir. Now we're off to the races.
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Old 25th April 2017, 09:10 PM   #20
vdi_nenna is offline vdi_nenna  United States
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I still don't know what to do with my vfet N/P pairs.
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