PWM Audio Filter
The PWM Audio Filter is designed to improve the audio quality when using the Raspberry Pi's on-board sound. The default PWM (Pulse Wave Modulation) signal is rather spikey. By running the signal through resistors and capacitors, the peaks and edges are softened to resemble curves, making it sound more natural, which results in a better listening experience.
One of the design goals with the PWM Audio Filter was to have it be directly-solderable to the Basic GPIO Assist board. The three through-hole pads line up, so you don't need to run any wires. Alternatively, you can wire it directly to the PWM pins on any Raspberry Pi.
Dimensions: 0.52 x 0.42 x 0.07in
Configuring PWM Audio