1K current limiting resistor.

The number of LEDs can also be increased by connecting more LEDs in circuit in the same manner. The 100K variable resistor is used to adjust the speed of flashing/running LEDs. The operating voltage of the circuit is 4.5V to 12V DC. If you are operating the circuit with 4.5V to 6V then replace the 1K current limiting resistors of all LEDs with 470 ohms resistors.
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The 555 is a versatile chip and it can perform wide variety of applications. It can be used in simple to complicated projects for example from a simple multivibrator to robotics. In this project it is used to create a running LEDs effect using 10 LEDs of any colour. Each LED is connected with its own
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555 Running LEDs Circuit Diagram