Introduction: 11 LED Adjustable Chaser With 555Timer

Parts:

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.

555Timer:

Pin1 to Gnd

Pin4 to Pwr

Pin8 to Pwr

Cd4017:

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.

Capacitors:

100nF(104) Pin5 to Gnd

10uF Pin6 to Gnd NEGATIVE SIDE to GROUND!

Resistors:

10k Pin7 to Pwr

120ohm Pin3 to Extra LED leg

-

1k x10 LED leg to other side

Potentiometer:

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.

Comments

author
JimmyT27 (author)2016-10-12

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

author
hkerr (author)JimmyT272016-10-12

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.

http://www.ti.com/lit/ds/symlink/cd4017b.pdf
http://www.ti.com/lit/ds/symlink/ne555.pdf

author
cgravesuk made it! (author)2016-06-17

Hi i have built your design and it seems to only flash the lone LED and chase the first 3 leds the other 7 dont light up.. could you please do a schematic as clearly some thing is not right.. Thanks!

IMG_1487.JPG
author
cgravesuk (author)cgravesuk2016-06-17

i have now made this on a single bread board just as you show. now none of them flash and only the lone one even turns on... i followed ur instructions..

author
rafununu (author)2016-05-04

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

author
gm280 (author)2016-05-03

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.

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