# 7 Led light running adjust speed by 4017 and 555

The led light running circuit generally can not adjust the speed of running. Cause dull monotony. Resulting in an idea to build this circuit up. This circuit can adjust the speed of the led light as needed. Makes this circuit can be used more versatile.

Operation of the circuit is divided into two parts: frequency generators. And the display. By the frequency generator IC1 contains a number Ic timer circuit 555 and frequency generator. Defined by the R1, VR1 and C1 will be the output signal at pin 3 of IC1 sent to display section.

In display section consists of IC2, a number CD4017 IC Counter circuit is displayed by the volt at pin 3, 2, 4, 7, 10, 1 and 5, respectively, each pin. The speed depends on the frequency count obtained from pin 14 of IC2, which we can adjust VR1 adjusts the frequency from the frequency generator part.

My son play this circuit enjoy!

10 LED Flashing using CD4017
LED Chaser by IC 4017 + IC 555
Random Number Generator by IC 4017 and 4011

## 10 thoughts on “7 Led light running adjust speed by 4017 and 555”

1. sir i want clean figer and explainnation of all parts… And also i want to know how to run several led bulb by direct current… Plz tell me circuit

2. sir,I want to submit followed web site such as member of your company.
pls,I followed cause an electron.diploma in londontech international.
and working as anelectro.technician in saudiarabia.
thanking you.
sisil

3. James says:

Pin 13 of the 4017 needs to go to ground although the picture shows it as pin 3 ( needs editing)

4. Thanks all,

5. sir this one not operating.first led only glowing seqance not happened

6. Kamran Siddiqi says:

In answer to Alex Prasanth’s problem:
Thanks to the Admin for such a great LED project.
Alex, I’ve been able to run the circuit perfectly with 10 LEDs, but with a few minor modifications. 1. The decade counter (4017) would not move if you don’t have pins 13(enable) & 15(reset)grounded. So check that.
2. I removed R2(220 Ohms).
3. I am using C1 = 1uF

7. Jibin says:

its nt working..!! All the leds are glowing..!!
Plz help..!!

8. subbana says: