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3 stages power amplifier project

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dmills:
100mA or thereabouts in the finals typically.

You will find setting this MUCH easier if you add at least 0.1 ohm of emitter resistors to the output transistors first...

Lucky-Luka:

--- Quote from: dmills on December 19, 2019, 11:13:25 pm ---100mA or thereabouts in the finals typically.

--- End quote ---
Less than that is acceptable?
More distortion will appear?

magic:
Try it :-/O

It depends on circuit. It also depends on output level, whether it falls in the A or B part of class AB. Popular wisdom has it that it isn't even as much about current as about some special value of voltage drop across the emitter resistors, regardless of their value, I think somebody has already posted about it here.

dmills:
The trick is trying to minimise the change in transconductance as you go from both devices active to just one, but it is a detail.

Lucky-Luka:
1)Why a current mirror (the one that Zero999 set at 1mA) in this stage is better than a resistor? Is it just because I can have more input impedence and so the gain stage can work better?
2)To incresce the bias current of the output stage do I have to increse the current mirror AND the voltage across the Vbe multiplier? I can properly understand the relation between those two factors.

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