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Glow LED’s in Blinking Pattern using NE555 Timer IC and CD4017 IC - KT950

Glow LED’s in Blinking Pattern using NE555 Timer IC and CD4017 IC - KT950


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Power supply - 9v from 9v battery




CD4017 IC

The importance Pins look at the table below.

1.) Pin 16 is the positive power supply and pin 8 is a ground.

The power supply range of 3 volts to 16 volts and Maximum power supply voltage at pin 1 must not much than 18 volts.

2.)Pin 13 is Clock enabled pins to controls the clock.
When it is “0” logic, the clock is enabled and the counter advances one count for each clock pulse.

When “1” logic, the clock input is stopped, and the counter does nothing even when a clock pulse arrives.

3.) Pin 14 is the clock triggers one count.

The clock pulse must be “clean”.

If they are “noisy” the counter may advance two or more times during each clock pulse.

4.) Pin 15 is the reset pin. Normally, it is “0”.

When made “1”, the counter is reset to “0”.

5.) Pins 1-7 and 9-11 are the decoded output pins.

The active count pin goes high and all others remain low.

6.) Pin 12 is Carry output, for the clock input of an additional counter or an external circuit that the count is complete.


  • Both IC Connected to the Breadboard.
  • 4017 IC Pin No. 1,2,3,4,5,6,7,10 to connected led's positive leg and Led's negative leg is GND.
  • 4017 IC Pin No. 8,13,15 are connected to the GND and Pin No. 16 connected to the positive supply.
  • 4017 IC Pin No. 14 is connected to the 555 IC Pin No. 3.
  • 555 Ic Pin No. 1 is GND and 555 Ic Pin No. 4 & 8 connected to the positive supply.
  • 555 IC Pin No. 2 to connected 10uF capacitor positive leg and negative leg is GND.
  • 555 IC Pin No. 2 to connected 10K pot 2nd (left) leg, 10K Pot Middle leg to connected 555 IC Pin No. 6 and 10K Pot 1st leg(right) to connected 1K Resistor and Resistor 2nd leg connected to the positive supply.
  • 555 IC Pin No. 6 to connected 10K pot middle leg.
  • Breadboard connection positive to positive and negative to the negative connection.


we used 8 LEDs which are connected by the output pins of the 4017 IC according to the sequence of output, start from zero and goes up to 10 but we are using only 8 output pins as the number of LEDs are 8 and it gets the clock pulse or pulse input from the 555 timer IC in Astable mode. As the LEDs start blinking we can adjust the speed of the blinking LEDs by setting the value of resistance through a potentiometer connected in the circuit because changing the value of resistance will change the oscillation frequency of the 555 timer IC, hence the rate of the clock pulse.