In our latest feature of DIY audio builds, we have [Patrick’s] vinyl cylindrical speaker. He found a pretty inexpensive Bluetooth audio amplifier on AliExpress. However, the amplifier module ...

In the ESP32 module the built-in DAC and ADC are used for audio in and output ... with no SSIDs and passwords to bother with. The DIY Walkie-Talkie circuit diagram. (Credit: Clemens Valens ...