Working principle: This circuit is an OCL audio power amplifier with a three-stage amplifier circuit, a differential input stage, an intermediate common emitter, and an output power amplifier stage. Q8, Q9, R23, R40, R21, D1, D2, and R1 form a current source to stabilize the quiescent current of the differential input stage and the intermediate amplifier stage, which are 5MA and 3.5MA respectively.
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