transistors - DIY: Led strip synced with music doesn't work - Electrical Engineering Stack Exchange
Sound Reactive Led Box - Instructables
ST MICROELECTRONICS TIP31C Discretes bipolar-transistors TIP31C Series NPN 100 V 3 A Power Transistor Through Hole - TO-220 - 50 item(s): Amazon.com: Industrial & Scientific
TIP31C Power TRANSISTORS(3A,100V,40W)NPN: Amazon.com: Industrial & Scientific
How To Make Music Reactive LED Strip Using Only TIP31 || English Subtitle - YouTube
How to make sound reactive LED's [tip 31] - YouTube