Good evening, they recommended this forum to try to answer my question.
I wanted to know if anyone can give me a hand in the analysis of the following circuit. Because she can't find her way back.
I hope you can help me.
Maybe: as the input signal gets bigger, the rectified input across C4 increases turning on Q2 more and sending more current through D3 and D4. Thus the impedance of D4 falls attenuating the output signal more. So as the input rises, the output gets more attenuated. That would make it a compressor or automatic volume control or automatic level control.