Price: $3.95 each
Part Number: LM3914N
LM3914 Bar/Dot display driver. Lights up to 10 leds (Bar mode) or 1 of 10 leds in (Dot Mode) in response to an input voltage. The chip contains a voltage divider and 10 comparators that turn on in sequence as the input voltage rises.
The LM3914 has a built in 1.2 variable voltage reference and can be cascaded together.