Thank You for amazing help! I will do step by step. My inctructor tell what I can choose by myself frequency steps.

But I have one problem at the beginning. I created schema like Yours, I add 20mV ( I try and 20, 100 V ) in AC voltage, but osicilograms showing something wrong.. I attachement some picture of it.
What can be problem at ?

VD1 is the problem.

Also all the parts I was using were selected just to show my point.
Do you have an actual list of the parts? Real parts!

 

VD1 is the problem.

Also all the parts I was using were selected just to show my point.
Do you have an actual list of the parts? Real parts!

How can I solved it ?
No, my inctructor tell what I have must by myself search or find it on internet all parts. ( I really don't know why ? ), becouse we don't created in real life audio amplifier! We just simulated on NI Multisim and whats all. We must got oscilograms and make same counting.

 

How can I solved it ?
No, my inctructor tell what I have must by myself search or find it on internet all parts. ( I really don't know why ? ), becouse we don't created in real life audio amplifier! We just simulated on NI Multisim and whats all. We must got oscilograms and make same counting.

Since your instructor did not give you list of parts, this tells me that you have a Design Assignment.

You were given list of design requirements/parameters:
P(out)= 2W
R(load/strain/workload) = 12Ω
Uin = 20mV
F = 300 Hz to 7 kHz
Rin = 2 kΩ
M <= 3dB
In this list there is the input: 20 mV at frequencies 300 Hz to 7 kHz.
Output: load resistor of 12 Ohm and maximum power at this resistor of 2 Watts.
Circuit behavior: input resistance 2 kOhm, M less or equal to 3 dB (I am not sure what M is).

It is your job to design the circuit.

Stop wasting time. Start designing.

 

Since your instructor did not give you list of parts, this tells me that you have a Design Assignment.

You were given list of design requirements/parameters:
P(out)= 2W
R(load/strain/workload) = 12Ω
Uin = 20mV
F = 300 Hz to 7 kHz
Rin = 2 kΩ
M <= 3dB
In this list there is the input: 20 mV at frequencies 300 Hz to 7 kHz.
Output: load resistor of 12 Ohm and maximum power at this resistor of 2 Watts.
Circuit behavior: input resistance 2 kOhm, M less or equal to 3 dB (I am not sure what M is).

It is your job to design the circuit.

Stop wasting time. Start designing.

But I already created this schema and from it I need oscilograms. Or I do something wrong ? What first of all I should do right now ?

 

But I already created this schema and from it I need oscilograms. Or I do something wrong ? What first of all I should do right now ?

If you already have the circuit then why are you saying you don't know how to do the PNP transistors?

 

If you already have the circuit then why are you saying you don't know how to do the PNP transistors?

No, right now Mr. Shteii01 tell me about this! I have just problem with Multisim program and arrow's!
Right now the schema is created right in Multisim, but now I have problems with oscilograms. ( Few post back )

 

P(out)= 2W
R(load/strain/workload) = 12Ω
Uin = 20mV
F = 300 Hz to 7 kHz
Rin = 2 kΩ
M <= 3dB

Those are the parameters of a circuit you are supposed to design, am I right?
My guess is that rio7 was given a circuit and a homework to find out the values.

 

Those are the parameters of a circuit you are supposed to design, am I right?

Yea, You are right! I have creating it, but oscilograms is working bad..

 

Hello,

One thread is enough:
http://forum.allaboutcircuits.com/threads/problem-with-schema-on-ni-multisim.105856/

Opening more threads on the same subject will cause confusion.

Bertus