In this video, I built a powerful 20-level LED VU Meter system using only transistors and diodes — no IC used. The project combines a 2-transistor audio amplifier stage with a 20-level bar graph VU meter circuit. The amplifier boosts the audio signal, and the multi-transistor ladder section converts the audio level into a smooth LED bar display. The VU meter section is built using BC337 transistors and 1N4148 diodes to create step-by-step voltage levels. As the audio signal increases, LEDs turn