Hello! I will construct P3A for my college project, but before constructing it i have to do some calculations so i started it with DC.
---> link to P3A amp 60-80W Power Amplifier
I am using Proteus ISIS on my college and i try to check all calculations with it.
THE BIGGEST problem is the calculation of Q5 base current, here is pic from Proteus:
i dont have a clue how to calculate it. I understand how to get Vbe multipliers current, but i dont understand how to get that Q9 emmiter current (or Q5 base current).
and one minor problem is in differential amp - in Q1 and Q2 base currents.
Q1 base current is smaller then Q2`s because base resistance of Q1 is bigger (24200 ohm, while Q2 resistance is 22k). This is all clear but i still dont have an idea to calculate it.
Thank you very much
---> link to P3A amp 60-80W Power Amplifier
I am using Proteus ISIS on my college and i try to check all calculations with it.
THE BIGGEST problem is the calculation of Q5 base current, here is pic from Proteus:

i dont have a clue how to calculate it. I understand how to get Vbe multipliers current, but i dont understand how to get that Q9 emmiter current (or Q5 base current).
and one minor problem is in differential amp - in Q1 and Q2 base currents.
Q1 base current is smaller then Q2`s because base resistance of Q1 is bigger (24200 ohm, while Q2 resistance is 22k). This is all clear but i still dont have an idea to calculate it.

Thank you very much