Multisim simulation

[wenlan]

Hello:

   My BJT and transformer simulation.

   I used the oscilloscope to observate the wave,and find it is not accord with the amplifier thoery.

   I cannot find what problem in my cricuits.and it works strange.

[_user32]

wenlan,

I think there is a simple mistake on how you've connected your Function Generator.   The middle terminal connection is ground/common, whereas the " - " terminal is the inverted output, 180 deg out of phase with the " + " terminal.  

This is commonlly confused and R&D should probably look at adding a small 'gnd' symbol to the center terminal to clarify.

- Pat