9THE LED MARQUEE

THIS CIRCUIT CREATES A RUNNING LIGHT, LIKE AN OLD THEATER MARQUEE.

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THE CIRCUIT DIAGRAM

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THE PARTS LIST

PART

VALUE

DESCRIPTION

R1, R2

10 kΩ

Two standard resistors

R3

470 Ω

Standard resistor

C1

4.7 μF

Polarized capacitor

L1 to L10

LED

Standard light-emitting diodes

U1

NE555

555 timer IC

U2

CD4017B

4017 decade counter IC

ABOUT THE CIRCUIT

This circuit uses a 555 timer and a 4017 decade counter, both integrated circuits. The voltage of the 555 timer’s pin 3 switches between high and low repeatedly, as you saw in ...

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