A rectangular control board holds an LM3915 bar graph LED driver chip, while a round display PCB holds 120 surface-mount green LEDs. The circular display board is mounted at the top of the control ...

An LED bar graph comprising five LEDs, each representing 1V of input signal, represents the MSD (most-significant digit). Nine LEDs in dot mode, in which only one LED lights, represent the LSD ...

The LM3914 LED bar graph driver was an amazing chip back in the day. Along with the LM3915, its logarithmic cousin, these chips gave a modern look to projects, allowing dancing LEDs to stand in ...