amplifier circuit

[tomb]

hello,

I'm doing my project at college and I was wondering if anybody could help me.

I need to build a amplifier circuit for or some tests and I have a circuit but cannot find one of the components, 2N3684.

just wondering if anybody knows of an inequivalent part

thank you

 

[audioguru]

A 2N3684 is a junction field-effect transistor with a 50V, 50mA rating.
Most little Jfets have a 25V rating.
In the amplifier will it ever have more than 25V across it?

 

[tomb]

nope. may reach 20V at max

 

[audioguru]

If 20V is max then you should be able to use any 25V Jfet that has a similar amount of biased current.
Why does the amplifier use a Jfet? Please post its spec's and its schematic.