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Old 11th October 2005, 09:20 AM   #1
PMA is offline PMA  Europe
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Default Any suggestion for a decent input JFET pair?

I am searching for a decent JFET input pair, it would operate with drain current between 1 - 2 mA. I have not worked with JFETs that much, so any suggestion would be greatly appreciated. It should be an available type.
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Old 11th October 2005, 10:05 AM   #2
MikeB is offline MikeB  Germany
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Hi Pavel,

I could recommend the 2sk170, at www.schuro.de you get them for a
reasonable price, original Toshiba-devices. (That's where i bought them)
The sk170 has max Vds of 40v, and i already used it in several designs,
without any problems. It has at least the transconductance of a "poor" bjt...
The 2sk389 is also interesting, it's a double device, i have some but not
used yet, so i don't know how good the matching is.

Mike
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Old 11th October 2005, 10:07 AM   #3
bocka is offline bocka  Germany
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Quote:
The 2sk389 is also interesting, it's a double device, i have some but not
Similar to OPs! Offset voltage is some mV
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Old 11th October 2005, 10:15 AM   #4
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Default Forgot to say that I need N-JFET + P-JFET

Hi Michael nad bocka,

thank you for your recommendations. I forgot to say that I need a couple of different conductivity, i.e. N-JFET + P-JFET.

Pavel
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Old 11th October 2005, 10:22 AM   #5
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Pavel,

the partner of the 2SK170 is the 2SJ74, 2.5 times more pricy though.
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Old 11th October 2005, 10:23 AM   #6
MikeB is offline MikeB  Germany
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Okay, in this case, 2sk170 + 2sj74 !
But the 2sj74 has max Vds of only 25v...
I've build complementary circuits using these 2, worked fine !

Mike
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Old 11th October 2005, 10:24 AM   #7
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Thank you jacco and Mike, I will download datasheets and review these components.
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Old 11th October 2005, 10:40 AM   #8
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to check for pairs :
http://www.geocities.co.jp/Technopol...in/tr_data.txt

Dalbani in the UK still has some of the complementary pairs.
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Old 11th October 2005, 11:22 AM   #9
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If you are going to use 2SK389 in complementary topology, then you also need 2SJ109.

OT - Could you show as a balance version schematic of your error correction amp, as you promise long time ago (if i'm not mistaking), thank you.

Best, a
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Old 11th October 2005, 12:05 PM   #10
PMA is offline PMA  Europe
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Quote:
Originally posted by aparatusonitus
I
OT - Could you show as a balance version schematic of your error correction amp, as you promise long time ago (if i'm not mistaking), thank you.

Best, a
I am afraid there is not much to say about it, 2 identical modules connected as follows:
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File Type: gif bal_errcorramp.gif (3.7 KB, 316 views)
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