Home Projects Motor, light and power control 6 Channel Auto Reverse Sequential Disco Running Lights



6 Channel Auto Reverse Sequential
Disco Running Lights

author: Siddharth Naik



From 230 V AC a DC supply of  + 5 V is obtained. The power supply is given to the other blocks. The pulse generator at a particular frequency generates the clock pulses. The clock pulses are counted by a counter and gives output after every 10 pulses. The counter drives the transistors, which form the triac firing circuit. The transistors fire the triacs and they provide sufficient current to the load. Decorative bulbs are connected as load for each triac. The bulbs are sequentially turned ON and OFF in forward and reverse way.


The IC 555 works as the pulse generator and feeds the clock pulses to IC 4017. IC 4017 is the heart of this circuit. It works as a counter and gives the output after every 10 pulses. It drives the transistors, which in turn fire the triacs. The triac provides sufficient current to the load.

Download this project in .doc


Electronic Devices and Circuits An Introduction  -  Allen Mottershead



R 1

47 KW


100 KW Potentiometer


56 W

R4 – R9

8.2 KW

R10 – R15

47 W

All resistors are carbon composition type of ¼ watt and tolerance of maximum 5%.


C 1

1000m¦, 16 V Electrolytic

C 2

1m¦, 16 V Electrolytic

C 3

0.01m¦ Ceramic


Diodes, Transistors and Triacs

D 1, D 2

IN 4007

D 3 – D 10

IN 4148

D 11 – D16

LED, Red color, 5mm

T 1 – T 6

BEL 187, NPN Transistor

T 7 – T 12

BT 136, 4A/400V


IC 1

7805, Voltage regulator

IC 2

555, Timer IC


4017, Decade counter


Switch    (S1)

1 Pole 6 way

Transformer  (T)

230 V / 9 – 0 – 9, 500mA

F 1, F 2


120x90 spot



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