Bargraph display drivers national semiconductor lm3914n 1 linear dot bar display driver 10 segments 5v to 20v supply voltage 0 to 70c 18 dip case the lm3914 is a monolithic integrated circuit that senses analogue voltage levels and drives 10 leds providing a linear analogue display drives leds lcds or vacuum fluorescents bar or dot display mode externally selectable by user expandable to displays of 100 steps national semiconductor lm3914n 1 led bardot display driver