Thumping level meters that pump with the volume ... The build relies on a very simple circuit that relies entirely on analog electronics in lieu of the usual digital signal analysis usually ...

VU meters measure the volume (intensity) of analog audio signals. They display signal levels in volume units (VU), a measure of average volume level. By definition, a volume indicator (VI) reading of ...

An Arduino Nano runs the show, with an envelope follower circuit ... other VU meter builds before too, like this one that uses a little physics knowledge to create a more realistic analog-like ...