Stereo Audio Codec for the ESP32 and Co. - Elektor Circuit Special 2024, p. 96 (240159) An error crept in the schematic and went unnoticed, our apologies for that! All the electrolytic capacitors in Figure 1 were drawn with the wrong polarity. The correct polarity is shown opposite. Also, the nominal voltage of these capacitors was not specified in the article. Since the ES8388 is a component with a nominal voltage of (maximum) 3.3◦V, 6.3◦V or 10◦V capacitors are suitable.