Help with multisim 11

[desislavov]

i try to simulate quasy power amplifier but i have only 29V in output .
Where is my mistake ?
Regards !!!

 

[desislavov]

Here is scope picture

 

[jackinnj]

Don't ground the "-" output of the generator, you also have the scope hooked up backwards.

 

[desislavov]

that is not a problem .

 

[JoMo]

Hi,
To me it doesn't look like you have any drive from the input stage to the Vas.
I think you want to connect the collector of Q1 to the base of Q5
That's the first thing I've noticed anyway.
All the best,
Joe

 

[desislavov]

JoMo , 10x my friend . I have mistake in circuit .

Now everyting work !

Thank you again !!!

 

[desislavov]

now i set supply current to +- 80V and 4 ohm speaker .

Scope in output say that the voltage is under 40V , why ?

 

[aparatusonitus]

Double click on generator and see the input voltage.

 

[desislavov]

supply +-70 , "speaker" 4 ohm

 

[aparatusonitus]

Your input voltage is 750mV...change it say 1V and see the magic 🙂

 

[desislavov]

with 1V a have 220 W .

With +- 70V and 4 ohm i want more power about 400 W ...