Semisouth JFET's: What are they good for? - diyAudio
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Old 6th October 2009, 08:51 PM   #1
Magura is offline Magura  Denmark
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Default Semisouth JFET's: What are they good for?

As I've been trying to keep the Semisouth GB thread reasonably clean, I guess it's time to open a dedicated thread, for discussing what we can get out of those little fellas


So.......do your worst


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Old 6th October 2009, 09:02 PM   #2
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A Son of Zen (or some variant) could be fun.
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Old 6th October 2009, 09:10 PM   #3
Magura is offline Magura  Denmark
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Some iteration of the F3 could also be interesting.

Could be easy, as there are boards made already, and most around here, already have the PSU part.

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Old 6th October 2009, 10:20 PM   #4
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Can you pop these buggers directly into the circuits as they are?
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Old 6th October 2009, 11:20 PM   #5
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Quote:
Originally Posted by ra7 View Post
Can you pop these buggers directly into the circuits as they are?
yup , with few minor changes in some resistor values .......
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Old 6th October 2009, 11:31 PM   #6
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They are pretty much drop in replacements for vertical
Mosfets. The bias voltage and thermal characteristics would
probably support replacements of Laterals as well.

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Old 7th October 2009, 12:33 AM   #7
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a Semisouth J-Fet Dao-Headphone Amp ?

Last edited by audiotux; 7th October 2009 at 12:36 AM. Reason: Failure
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Old 7th October 2009, 12:53 AM   #8
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hi guys
im glad this thread has been started as i was not sure what to use mine for

what about replacing the irfp240 on a aleph 4 clone ?

is this doable and if so would i need the same amount ie 24

regards sheafer
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Old 7th October 2009, 02:38 AM   #9
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Nelson's J2 circuit has elements of the Aleph-J and BA-1 from what I see.
Can't be too wrong to start somewhere around their. will ask cviller at BA-3 what's going on with those front end boards.
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Old 7th October 2009, 11:36 AM   #10
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Default stability issues ?

How prone are these Semisouth devices to oscillations compared to
say, a mosfet? MOS devices would typically need a couple of hundred ohms
right at the gate to stabilise them, are these required at these values?

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