Engineering problem
Separate audio into bass and treble bands to illuminate LEDs proportionally to each band’s signal level.
Design and tests
The original report describes second-order Sallen-Key filtering at approximately 320 Hz and 640 Hz, peak detectors, analog and PWM LED-driver stages, and component selection using Python, circuit calculations and Multisim simulation. Experiments used Analog Discovery 2 with WaveForms.
Evidence
Download the original report. This is a student engineering project and its reported results should not be generalized beyond the documented test conditions.