kindly tell me what is the problem in this circuit contained in attachement
it should give gain of 4

 

guys i am attaching a picture of the circuit
anybody who knows to design it in proteus kindly design it with the graphs of input and output please
and send me that file here its urgent

 

The emitter bypass cap was TO BIG. See the above circuit and component values.

 

If that is supposed to be a mosfet, you have drawn it as a P channel mosfet. Is that what you intended to use? In a +10V circuit?

 

yap i intended to use a NMOSFET ( n Channel)
Tell me the role of bypass capacitor please
and in which software you did it tell me
And did you used NPN transistor or N channel mosfet.
I think you used BJT and i want to do this with NMOS


I am trying to do with MOSFET but it ain't working

 

Just to make things a bit more clear...

I do not think this configuration will work for a MOSFET well, it is meant for a BJT transistor. The two types of transistors are very different, they are not interchangeable.

 

thank you BIll
but what is the reason that this configuration will not work for a MOSFET

 

For sure this circuit can work good withe MOSFET.
But to do this properly you need to know the TYPE of the mosfet and
Vt; K etc. Or find this parameters in data sheet.


PS Simulation software
http://www.engr.uky.edu/~cathey/pspice/Ps8_0.zip
Or
LTspice
http://www.linear.com/designtools/software/

 

 

Your Mosfet designs have the Mosfet operating where many are completely cutoff (Vgs less than the threshold voltage) and not working. You need to use enough gate-source voltage so that most or all of them are conducting enough current to work.