11 LED Adjustable Chaser With 555Timer





Introduction: 11 LED Adjustable Chaser With 555Timer


Leds: Pack of 25 Can use Purple Ones

IC: 555 timer, CD4017

Capacitor: 10uf, 100nf(104)

Potentiometer: 10k Linear Mono

Resistors: 1k, 10k, 120ohm

Breadboard + Cables + Battery Clip

Step 1: Place Base Components

The 555 timer and Cd4017 are placed along with the leds and the wires connecting to power and ground.


Pin1 to Gnd

Pin4 to Pwr

Pin8 to Pwr


Pin8 to Gnd

Pin13 to Gnd

Pin15 to Gnd

Pin16 to Pwr

Step 2: Add the Rest of the Components

The capacitors, resistors and potentiometer as well as the last led are added.


100nF(104) Pin5 to Gnd



10k Pin7 to Pwr

120ohm Pin3 to Extra LED leg


1k x10 LED leg to other side


10k at edge

Step 3: First Wires

Right Potentiometer leg to Pin5

Middle Potentiometer leg to Pin7

Left Potentiometer leg to Pin7

Pin6 To Pin2

Step 4: Alittle More Wires

Pin14 to LED leg


CD4017 to Resistor (LED)

Pin3 to LED1

Pin2 to LED2

Pin4 to LED3

Pin7 to LED4

Pin10 to LED5

Pin1 to LED6

Pin5 to LED7

Pin6 to LED8

Pin9 to LED9

Pin11 to LED10


Pin12 No connection

Step 5: Its Done

Potentiometer Varies the Speed.

DC 5-10V

The circuit can be soldered and then included in a robot to give a cool effect.



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4 Discussions

Can I add a strip of 5-10 LEDs instead of each single LED , and will be there a necessity to change the resistors or input voltage?
Thanks in advance

1 reply

In the original, each led is controlled separately so if an led strip was added to one output it would only light up for that output (each led is connected to a different pin of the cd4017). If you wanted to connect an led strip to each separate output you could but it would need 12V (12v standard for led strips, some run on 5V). Looking at the data sheets it looks like you could but you would need to make sure the rest of your components can handle 12v and probably around 1 Amp (depends on length and number of leds). The resistors going to the leds could then possibly be removed if the led strips can handle the current. Transistors or MOSFETS could also be used at each output so the higher current isn't being drawn through the other components.

I will try this with an led strip as it would give a nice effect and then later reply.


You don't need all these resistors, one is enough because there's only one 4017 output active at a time.


2 years ago

A schematic would be extremely helpful. And I don't know if you know, but they sell resistor DIP chips exactly for this type setup. It makes a PC circuit board a lot easier to setup. JMHO! Otherwise seem like a nice circuit.