Simplest ultrasonic ANTISPY voice recording jammer based on ATTINY/ARDUINO module (PWM or optionally AD8933 signal generator) with audio amplifier or H-bridge+MOSFETs driving piezo ultrasonic transducers + coils

A simple NodeMCU based internet radio receiver.

A NEARLY_any audio player based on ESP32 & Arduino. 一个基于ESP32&Arduino的播放器，基本上可以播放任何音频。

Library kicad for pam8403 module

An FM radio receiver built using an ESP12E, interfaced with the RDA5807M module. Powered by a Li-Ion battery with a TP4056 charging module, amplified by a PAM8403, and output through a 10-watt speaker. Features station switching via a button.