Simple Stereo VU Meter


I 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.

Circuit

Circuit diagram


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