October 2018
Beginner
80 pages
1h 30m
English
Content preview from A Beginner's Guide to Circuits
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9THE LED MARQUEE
THIS CIRCUIT CREATES A RUNNING LIGHT, LIKE AN OLD THEATER MARQUEE.
THE CIRCUIT DIAGRAM
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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