A condenser microphone is easy enough to explain ... If that capacitance is incorporated into an RC circuit with a very high impedance and a high voltage is applied, a near constant charge ...
along with a low-cost condenser microphone with a transistor-based preamplifier and an LM386 op-amp for the speaker circuit. In the ESP32 module the built-in DAC and ADC are used for audio in and ...
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