Note that a Schottky diode is not critical in this crude circuit, a standard silicon diode such as the 1N4007 can be used as a substitute. Nowadays we can see mass-produced analog VU meters with ...

An Arduino Nano runs the show, with an envelope follower circuit feeding a ... necessary commands to the PT6314 driver to update the display. The resulting VU meter has 38 bars per channel ...

It’s a volume units meter for his sound ... using an AN6884 LED driver chip. It has an integrated amplifier circuit which makes it the perfect part for building a VU display.