Free circuit diagrams

Bookmark and Share
privacy policy

6 Channel Auto Reverse Sequential Disco Running Lights

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.

Circuit diagram

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
R2 100 KW Potentiometer
R3 56 W
R4 R9 8.2 KW
R10 R15 47 W
All resistors are carbon composition type of watt and tolerance of maximum 5%.
C 1 1000m, 16 V Electrolytic
C 2 1m, 16 V Electrolytic
C 3 0.01m Ceramic
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
IC3 4017, Decade counter
Switch (S1) 1 Pole 6 way
Transformer (T) 230 V / 9 0 9, 500mA
F 1, F 2 Fuse

author:Siddharth Naik,

Link to this page for forums and blogs:
All content on this site is provided as is and without any guarantee on any kind, implied or otherwise. We cannot be held responsible for any errors, omissions, or damages arising out of use of information available on this web site. The content in this site may contain COPYRIGHTED information and should not be reproduced in any way without prior permission from the authors. Be aware! Electricity can kill! © 2008.
page generated in :0.0294