running light using 7490 ic
#1

Running light circuit by using 555ic and 7490ic.
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#2

Which it use 12 LEDs only. There are a interated running form. To begin with LED flash from the center to the edge on both sides. Then, to runs back to the center again. Like this indefinitely. Until the battery will fully lose or the switch opened circuit.

Simple 12 LED running using CD4017 and NE555

How it works
This circuit include a few parts. It may be divided into two section as follows:
1. the pulse signal generator
2. The counter
1. The pulse signal generator section include IC1-555,R1, VR1, C1 and C2. The output signal at pin 3 will be the square wave,that can be adjusted frequencies by VR1.

Then, send the signal to the input of IC2 that is the decade counter circuit. The IC2’s pin 14 will count the input signal continuously, and show at the output “1” on pin 3, 2, 4, 7, 10, 1, 5, 6, 9, 11 respectively.

The connecting LEDs to display in this circuit will see that is LED running two way from middel.

Parts you will need.
IC1_____NE555__Timer
IC2_____CD4017___Decade counter with 10 decoded outputs IC
C1______3.3uF 16V___Electrolytic Capacitors
C2______0.01uF 50V__Ceramic Capacitors
R1______4.7K__1/4W Resistors tolerance: 5%
VR1_____100K Potentiometer
LED1-LED12___as you like

Eleccircuit highly recommends EasyEDA for PCB design and order


to get more data about it please visit:

https://scribddoc/75078119/6-Channel-Auto-Reverse-Sequential-Disco-Running-Lights
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