Simple 12 db low pass filter. This filter use 2 BC547 NPN transistor and a stereo 100k pot for the cutoff, instead of the pot… | Filters, Synthesizer diy, Pass
Active Low Pass Filter: Design and Applications | Electrical4U
Low pass filter issue : r/diyaudio
Audio EQ: What Is A Low-Pass Filter & How Do LPFs Work? – My New Microphone