I've just built a simple n-channel fet switch -Supply 5V
S=0v
G=15k to +5v
D=1K to +5V

Why is there a current flowing into the gate?
I thought FETs were voltage controlled?
I've also simulated this in Tina-TI - same result - Am I going loopy?

 

How much gate current is there?

 

Is this a junction FET or a MOSFET?
An N-JFET will have gate current when the Vgs is positive, since it becomes a forward biased diode.

 

Its a 2n3822 JFET - Thanks all - I understand now.

 

I've just replaced it with MOSFET and all's as expected - Thanks again.

 

Well, once in a while someone who can see their mistakes on their own, welcome to the forum

 

Thats whats so good about the internet - the whole world can help you!

 

And this forum of course!