Matching jfet at what voltage?

Sunsun22 · 28th July 2010, 11:51 AM

There are a number of articles suggesting matching jfets, usually at 10V. Yet, if my circuit works at, say for example, 20V, should I adjust the voltage of the matching circuit to 20V?

lineup · 28th July 2010, 01:53 PM

Yes, I would use 20 Volt.
Matching at 10 Volt would most probable be good enough,
but I like to match at the level devices should work.

When matching high power transistors, it is not as easy
to setup a situation with lots of power and heat.
But for small signal JFET and BJT this is less of a problem.

AndrewT · 28th July 2010, 02:23 PM

jFETs may not be at their best with 20Vds

I agree test/measure/match devices for the operating conditions of the application. Vds, Id, Tj/Tc,

Sunsun22 · 29th July 2010, 11:57 AM

Thank you for the input.

28th July 2010, 11:51 AM	#1
Sunsun22 diyAudio Member Join Date: Jul 2004 Location: Hong Kong	Matching jfet at what voltage? There are a number of articles suggesting matching jfets, usually at 10V. Yet, if my circuit works at, say for example, 20V, should I adjust the voltage of the matching circuit to 20V?

28th July 2010, 01:53 PM	#2
lineup diyAudio Member Join Date: Dec 2005 Location: the north	Yes, I would use 20 Volt. Matching at 10 Volt would most probable be good enough, but I like to match at the level devices should work. When matching high power transistors, it is not as easy to setup a situation with lots of power and heat. But for small signal JFET and BJT this is less of a problem. __________________ lineup

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28th July 2010, 02:23 PM	#3
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	jFETs may not be at their best with 20Vds I agree test/measure/match devices for the operating conditions of the application. Vds, Id, Tj/Tc,

29th July 2010, 11:57 AM	#4
Sunsun22 diyAudio Member Join Date: Jul 2004 Location: Hong Kong	Thank you for the input.