Jfet buffer

AnalogKid

Joined Aug 1, 2013
8,259
No. In a simulation program a battery is considered to be a perfect voltage source, so the output would be V2 with or without the FET. When you run the sim what does it show?

ak
 

DickCappels

Joined Aug 21, 2008
6,099
No, it creates a constant current source that only conducts when the instantaneous voltage from the AC voltage source is sufficiently high enough compared to the battery voltage to allow the JFET to generate enough current to cause the JFET to pinch off. Just noticed that your AC source is only 1V, there are few JFETs that will pinch off at such a low voltage.
 

Thread Starter

coinmaster

Joined Dec 24, 2015
502
No. In a simulation program a battery is considered to be a perfect voltage source, so the output would be V2 with or without the FET. When you run the sim what does it show?

ak
Whoops I was reading the wrong terminal by accident.
How bout this?

Screenshot_7.png

Seems to work except I don't know where I'm going to get a p-jfet that can handle -80v. SIC versions are only n-type.
 
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