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 ...
Truth be told, we have more than one chip of shame, but for audio amplification purposes, it’s the LM386. The LM386 is an old design, and requires a few supporting passive components to get its ...
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