Basically, a VU Meter measures loudness (volume units) of an audio signal. But this blinking VU meter project catches the eye more than the ear. The construction of the VU meter using 12 flashing bulbs is relatively simple. At the heart is a 12 outlet controller box with each outlet connected to two layers of six solid state relays. An mp3 player is plugged into a VU meter controller which also outputs the audio to an attached speaker.
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