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 ...

Opinions expressed by Forbes Contributors are their own. Technology journalist specializing in audio, computing and Apple Macs. Have you ever been to a live performance of a favorite band or ...