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L80, Stereo VU Meter

It’s the circuit of stereo VU meter. like to see lights move to music. This project will indicate the volume level of the audio going to your speakers by lighting up LEDS. The LEDS can be any color so mix them up and really make it look good. The input of the circuit is connected to the speaker output of your audio amplifier. You want to build two identical units to indicate both right and left channels. The input signal level is adjusted by the 10k ohm VR. If you wish to make a very large scale model of this unit and hang it on your wall, there is an optional output transistor that can drive many LEDS at once. The unit I built drove three LEDS for each output. The sequence of the LEDS lighting are as follows Pin 1, 18, 17, 16, 15, 14, 13, 12, 11, 10.


  • IC = LM3915

  • Resistors = 10K (VR), 1K

  • Capacitor = 1uf

  • LEDs (Any color)

  • S1 = on/off switch

  • Battery 9volt to 12volt

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