They decided to demo it using a giant bulb based VU meter. The control box has 12 individual ... The simple audio circuit used for the VU is based on the LM3915. You’ll find full plans on ...

No problem; building a VU meter is easy with these instructions from [Joe]. You’ll need either an LM3915 or LM3916 chip, a couple of bread boards, two audio jacks, ten LEDs, and a few other ...