Disco LED lights Circuit was a fun thing, that everyone can construct by their own.In this we are going to use NE 555(IC 1) and CD 4017(IC 2). Usually NE 555 is used in variety of timer circuits,pulse generation and oscillator applications.It can also be used as a Flip-Flop element.The IC 2 CD4017 was Johnson counter which gives decoded outputs with inputs of clock signal,clock inhibit,carry out and thus it produces counters as output.
WORKING OF DISCO LED LIGHTS CIRCUIT:
This circuit uses NE 555 as an astable multivibrator .In astable mode the 555 timer puts out a continuous stream of clock pulses for the IC 2 CD 4017.Since in this circuit the NE 555 was working in normal condition so the 5th pin of the NE 555 was not used in the above circuit.Moreover in Astable condition the NE 555 can work without external triggering so this was preferred than other multivibrator circuits.Thus it provides a series of clock pulses as output to the CD 4017.
In the CD 4017(IC 2) takes the clock pulses from the multivibrator as input and it provides the counters(decoded outputs).These counters are advanced by one during every positive cycle of the clock pulse if the Clock Inhibit signal is kept low.Carry Out signal was given finally since Carry Out signal will completes one cycle and makes it to begin from the first LED D1.Thus it makes a disco light.The speed of the LEDs depend on the frequency of the clock pulses generated..Pin diagrams of these IC 1 & IC 2 was given for your better understanding.
NE 555 (IC 1) PIN DIAGRAM:
CD 4017 (IC 2) PIN DIAGRAM:
Using Multicolor LED’s will provide a great disco effect in this circuit. The speed of the lighting can be varied by means of the POT R2 connected to the IC 555.