Download video: LM3915 IC VU Meter Tower
Channel: Adrian Neamtu
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10pcs of plexiglass, 20 LEDs of different color. Powered by a 5V phone charger. This is the circuit I used. https://dl.dropboxusercontent.com/u/25771326/Reviewed%20Diagram%203915.jpg
Feel free to experiment with the values because you may experience some flicker on the LEDs. Also adjust your potentiometer to the maximum volume of sound coming from computer. Better use a breadboard before for testing.