SparkFun I2S Audio Breakout - MAX98357A The SparkFun I2S Audio Breakout board uses the MAX98357A digital to analog converter (DAC), which converts I2S (not be confused with I2C) audio to an analog signal to drive speakers.
Adafruit Stereo FM Transmitter with RDS/RBDS Breakout - Si4713 Yaaar! Become your very own pirate radio station with this FM radio transmitter.
LM358 Signal Amplifier Module
SparkFun Noisy Cricket Stereo Amplifier - 1.5W You won’t need a series four de-atomizer with our rendition of the Noisy Cricket, just wire it up and crank up your tunes!