Any suggestion for a decent input JFET pair?

PMA · 11th October 2005, 09:20 AM

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.

MikeB · 11th October 2005, 10:05 AM

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

bocka · 11th October 2005, 10:07 AM

Quote:

The 2sk389 is also interesting, it's a double device, i have some but not

Similar to OPs! Offset voltage is some mV

PMA · 11th October 2005, 10:15 AM

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

jacco vermeulen · 11th October 2005, 10:22 AM

Pavel,

the partner of the 2SK170 is the 2SJ74, 2.5 times more pricy though.

MikeB · 11th October 2005, 10:23 AM

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

PMA · 11th October 2005, 10:24 AM

Thank you jacco and Mike, I will download datasheets and review these components.

jacco vermeulen · 11th October 2005, 10:40 AM

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.

aparatusonitus · 11th October 2005, 11:22 AM

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

PMA · 11th October 2005, 12:05 PM

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:

11th October 2005, 09:20 AM	#1
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	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.

11th October 2005, 10:15 AM	#4
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	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

11th October 2005, 10:22 AM	#5
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	Pavel, the partner of the 2SK170 is the 2SJ74, 2.5 times more pricy though. __________________ Looks like Sponge Bob has killed another thread.

11th October 2005, 10:40 AM	#8
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	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. __________________ Looks like Sponge Bob has killed another thread.

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11th October 2005, 10:05 AM	#2
MikeB diyAudio Member Join Date: Apr 2004 Location: Gütersloh	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

11th October 2005, 10:23 AM	#6
MikeB diyAudio Member Join Date: Apr 2004 Location: Gütersloh	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

11th October 2005, 10:24 AM	#7
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	Thank you jacco and Mike, I will download datasheets and review these components.

11th October 2005, 11:22 AM	#9
aparatusonitus diyAudio Member Join Date: Jan 2004 Location: Split, Croatia	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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