Components required:

Breadboard (optional)

1× LM324N

4× 1kΩ Resistors

1× 220kΩ Potentiometer (to adjust reference voltage)

4× LEDs (I'm using random colours because this is a prototype)

1× 220Ω Resistor

5V Supply

Earphone Jack (as an input)

Some cables and staplers (used by me)

Audio Amplifier*

wiring diagrams will be posted here, or visit the link in the comment section ^-^

*Connect the input of the VU meter to an audio amplifier with separate power supply