beheshtaein
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Yes. As voltage across R11 increase it go "towards" class A, increasing dc current absorption with no signal. And (usually) diminishing distortion.Mosfets are working as a push-pull AB class amplifier?
Almost exact. R7, R6 and C7//C8 form the feedback path. Any negative feedback decrease gain (the closed loop gain is lower than open loop gain), increase bandwidth and decrease equivalent output resistance.R7 is making a feedback path to correct bandwidth and output resistance?
Remember: a voltage divider cannot amplify.R17,R18 make a voltage devider to amplify the output?
Probaly mirroring Q9 change many voltages and currents in the circuit and now BD140 can works.i think the problem of Q6 was solved by mirroring Q9...
I don't know so much about model but I agree. Following your link I saw small signal gain 450 - 900 but remember that hfe can vary a lot then Bf=401.6 is not so strange for a general model.the problem(gain is about 700 or 800!!!) isn't solved yet,what should i do?
it seems that gain should be about 400(since the model syas:Bf=401) is that right?
but here in this link you see that hfe of this transistor is between 380 & 800!
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