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

It used to be a must-have on any hi-fi, a pair of moving coil meters or LED bar graphs, the VU meter. Your 1980s boombox ... were invariably driven by the LM3915, a chip that contains a resistor ...