Consider first the transistor amplifier stage comprising Q2, R6, R7, R1, R8. Do you know how to calculate the gain of that stage?
Sorry, that goes beyond answering the question I asked and my maths is too rusty for a full circuit analysis .This photo is correct or not for gain calculation ?
Well, your small signal equivalent model is not quite correct.This photo is correct or not for gain calculation ?
Where is my fault ? Rejoice if you help me.Well, your small signal equivalent model is not quite correct.