The circuity is designed around the National (now TI) LM3914/15/16 display driver which is often used in LED VU-Meters. You’ll find hundreds of DIY meters when looking at Youtube for example.

Posted in Microcontrollers Tagged audio, CH32V003, level, lm3914, lm3915, RISC-V, synth, VU meter ← A Low Effort, Low Energy Doorbell ...

[youtube= [ricosgoo] wanted a way to stand out at his graduation. We think he succeeded with his graduation gown VU meter. After putting the circuit together at the last minute, he made a mounting … ...