LED Chaser Circuit using CD4017 and 555
Build a simple LED chaser circuit using CD4017 and NE 555 timer ic. The circuit contains small number of of components and very beginners can also do the project. You can also check updated project of CD4017 here. The LED Chaser working with the help of 6v-9v DC supply. so keep in mind that do not exceed the input voltage rate above its maximum input voltage range.
CD4017 and also NE555 timer ic working perfectly in 6v DC voltage, so using a voltage regulator of LM7806 is better to control from the input voltage fluctuations. I hope you got some basic ideas about this LED chaser circuit, ok lets discuss the further details of the circuit.
LED Chaser Circuit Diagram
Components List
- CD4017 IC – 1
- NE555 Timer ic – 1
- LED – 11
- 10 K preset pot – 1
- 10uf capacitor – 1
- 0.01uf capacitor – 1
- 10 K resistor – 1
- 680 OHM resistor – 1
- 9v battery – 1
- battery connector
LED Chaser Working
The 555 timer wired as an astable multivibrator & its output is directly connected to the clock input of counter ic CD4017. The output pulse frequency of 555 timer is controlled by R1, RV1 and also the capacitor C1. The positive voltage is providing to the 8th pin and negative to the 1 st Pin of 555 IC. The control voltage of 5th pin is not using to connect. To avoiding the frequency noise capacitor C2 0.01uf to the ground pin.
The LED D1 is connected in the clock pin of CD4017 IC. it is used as indicating the output of 555 IC and the resistor 680 ohms is for limiting the current passage through the LED.
Similarly the 16th pin of CD4017 is connected to the positive supply voltage and 8 the pin to negative. The clock enable pin 13 connected to ground and is an active low input. The clock pin of 14th is connected to the output pin of 555 ic.
Only a single resistor is required to control whole led, since only one LED will turn on and off at a time.
The output frequency of 555 timer IC can be calculated using this equation.
Output Frequency = 1.44/((R1 + 2RV1) * C1)
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Great job
Thanks buddy