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

What RGB LED strip controller should I buy when my LED strip has 4

How To Make a Music Reactive LED Circuit Using NPN Transistors

LED to music sync barely blinking even with amplifier - Electrical

Trying to improve an LED strip circuit thats activated by music

phaseboundary – Phase Boundary

Phase Boundary – reviews and creations in music and engineering

surface mount - Upside-Down SMD LED - Electrical Engineering

How To Make Music Reactive LED Strip Without IC Using Transistor

mosfet - Powering multiple led strips by one switch - Electrical

Outguessing the machine

music reactive led strip Using Transistors - Techatronic

What RGB LED strip controller should I buy when my LED strip has 4