Do you want the passive kind where the lowest ones glow super bright and the highest ones glow dimly? That's a stack of LEDs, with a resistor in parallel with all but the bottom one, and one resistor in series with the input. Typical might be 100 ohms for the resistors.
For equal lighting and sharp thresholds, get a LM3914 (while you still can, they're going obsolete) and follow the circuit in the datasheet.
Tim