Dear all,
I'm trying to run ESP32_MP3_Decoder with a MAX98357A board from Aliexpress and a 4R speaker from Aliexpress.
The speaker measures 4R with my multimeter.
I'm powering the whole thing from a 1A USB charger.
I've tried powering the MAX98357A board from the regulated 3.3V from the ESP32 board and directly from Vin on the ESP32 board (4.5V in my case).
make monitor shows that a stream is playing (buffering at about 95-99%).
I've measured LCR, BCLK and DIN with an oscilloscope and these look good (see the screenshots), but there's no audible output on the speaker.
Measuring the speaker output with an oscilloscope shows some regular gibberish with frequencies of 250KHz and above.
What can I be doing wrong?
Is it possible that the USB charger doesn't give enough current to power the MAX98357A?

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