Shhh, keep it down (out-of-band noise, that is) - Automotive - Technical articles - TI E2E support forums
Generate Sine Wave using Arduino DAC and RC Low Pass Filter | ee-diary
Low-Pass Filter a PWM Signal into an Analog Voltage - Technical Articles
Archimago's Musings: NOS vs. Digital Filtering DACs: Exploring filtering turned off, implications, fidelity and subjective audibility. (Recent BorderPatrol DAC chatter...)
How to design an adequate low-pass filter for a PWM DAC conversion of audio range signal - Quora
Don't Fear The Filter: Lowpass Edition | Hackaday
What is the purpose of these passive high and low pass filters with this audio DAC which already has internal filtering? - Electrical Engineering Stack Exchange
How to design and implement a digital low-pass filter on an Arduino - YouTube
Differential low pass filter to single ended -> Differential low pass filter - Electrical Engineering Stack Exchange
Suggested low pass filter for a DAC
Low Pass Filter for Pulse Width Modulation? - General Electronics - Arduino Forum