Figure 1 shows a simple system using comparators to do the level monitoring. The key advantages to using this method are cost and design simplicity. TI’s LM391x can be used as a precision analog ...

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 would have had them, for example. VU, for “Volume Units”, is a measure of audio ...

There are many very cool visual effects for music, but the best are the kind you build yourself. [Ben’s] mini LED volume towers adds some nice bling to your music. [Ben] was inspired to created this ...