transistors - DIY: Led strip synced with music doesn't work - Electrical Engineering Stack Exchange

I made led strip synced with music using this schematic I used bd241c instade of tip 31. When i connect 5V and single LED it works fine but when I put 12V and LED strip it doesnt work. Can someone

led - Building NOT gate with transistor -- output remains always

How to turn-on NPN transistor? - Electrical Engineering Stack Exchange

transistors - Toggle between two leds - Electrical Engineering

How To Make Music Reactive Led Light Using Only One Transistor

transistors - LED current at output of AND gate - Electrical

transistors - Make: Electronics (Experiment 11) LED blinks only

led - Building NOT gate with transistor -- output remains always

led - I connected two BJT NPN transistors and don't quite

Transistors as switch and amplifier to control LED strip