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thx. sorry still don't understand: C2/R3 can stable point A, can they stable point B too?
thank you very much!Point A will be stable. Point B will have the input signal, JUST the input signal and no contribution from power supply ripple and noise, because it is biassed from point A which is stable.
For the input to get to point B it passes through a high-pass filter formed of C1 and R1||R2 (in parallel) which cuts off below 2.7Hz thus removing any DC component