I am trying to design an audio amplifier circuit using BJT These are the requirements of the circuit Input signal: 50-100 mV (It's the output of my iphone's mic) 2W-4ohm speaker There is no requirement for DC voltage source. I can choose so as to feed enough for my circuit. Here's my approach I choose to use 12V DC source and design my circuit into two blocks. The first block is an EC amplifier stage which is to amplify my voltage according to the requirement. The second block is for power amplifier, in which I choose emitter-follower as driver stages before a push-pull circuit. I want to use class A stages in that position for impedance matching and to increase the total gain of the power amplifier
But the problem is my power amplifier stage doesn't seem to work and the output of the first stage is just 2V peak (It is expected to be 4V peak)
Is my design reasonable? If yes, what's wrong with it?