Does the capacitor in this circuit serve as a low-pass filter?
The premise of the circuit is to be a small SD card based music player. The write up, Simple SD Audio Player with an 8-pin IC, says that it is necessary to filter the PWM output with a low-pass filter. I believe this is usually done with a capacitor. Unfortunately, I'm not overly familiar with the mechanism that a capacitor uses to act as a low-pass filter. Is the capacitor in this circuit acting as a low-pass filter? If yes, then what value capacitor would be good as a low-pass filter for the PWM output?