SunFounder ESP32 Starter Kit
4. Build the circuit.
As this is a mono amplifier, you can connect IO25 to the L or R pin of the audio amplifier module.
The 10K resistor is used to reduce high-frequency noise and lower the audio volume. It forms an RC
low-pass filter with the parasitic capacitance of the DAC and audio amplifier. This filter decreases the
amplitude of high-frequency signals, effectively reducing high-frequency noise. So, adding the 10K
resistor makes the music sound softer and eliminates unwanted high-frequency noise.
If your SD card’s music is already soft, you can remove or replace the resistor with a smaller value.
5. Connect ESP32-WROOM-32E to the computer using the USB cable.
156 Chapter 1. For Arduino User
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