hello guys i really need your help now. I'm trying to find a audio amplifier circuit suitable for simulation that has 25W output power which I can solve the voltage gain, bandwidth, input and output impedance and the power efficiency. that you for your feedback.

 

There's one in this post:
https://forum.allaboutcircuits.com/...nd-output-impedance-of-this-amplifier.193998/

 

A Class-A 25W amplifier using a single transistor?
Good luck finding that!

 

Who said anything about class A or a single transistor?

I know the title says “only with transistor.” But this is incorrect English and could be corrected two ways, “only with transistors” or “with only one transistor.” You have chosen the second interpretation. I think the first is more likely.

And I don’t have any idea about where class A came from. There are single transistor class C amplifiers.

 

Who said anything about class A or a single transistor?

I know the title says “only with transistor.” But this is incorrect English and could be corrected two ways, “only with transistors” or “with only one transistor.” You have chosen the second interpretation. I think the first is more likely.

And I don’t have any idea about where class A came from. There are single transistor class C amplifiers.

Sorry. I misread the title.

 

I just need a amplifier that are build with transistors without opamps

 

See post #2.

 

Is your assignment to design one, or to find a circuit designed by someone else?