Introduction: FLASHING LED


In this Instructable you will make a LED flasher. You will also be able to adjust it.

Step 1: Bill of Materials

Picture of Bill of Materials

  1x 555 timer
  1x LED
  1x 9 volt battery and clip
  1x 220μf capacitor
  1x 101 Ω resister
  1x 101 Ω variable resister
  1x 900 Ω resister
  multiple wires

Step 2: The Schematic

Picture of The Schematic

Here is the schematic for the flasher.

Step 3: Insert the Wires and the Timer

Picture of Insert the Wires and the Timer

Connect pin 2 and pin 6. Connect pin 1 to the negative of the battery clip. Connect pin 8 to the positive side of the battery clip. Sorry for the bad pic.

Step 4: Connect the Other Parts

Picture of Connect the Other Parts

Connect the 220 uf capacitor between pin 1 and 2. Connect the led anode(+) to pin 3. Connect the led cathode(-) to the 101 ohm resister. Connect the other end of the resister to ground(-). connect the variable 101 ohm resister between pin 8 and 7. Connect the 900 ohm resister between pins 6 and 7.

Step 5: Your Done!

Picture of Your Done!

Yay, your done! You can change the frequency of the blinking by turning the variable resister knob.


robot1398 (author)2011-04-23

need a bigger schematic cant understand a thing

MACKattacksnipe (author)2010-07-02

Whats That a Picture(s) of???

peterlonz (author)2010-03-23

Look thanks for posting this BUT:
You really are not helping folks with the poorly drawn circuit diagram, it's almost certain to create avoidable mistakes.
Also 9V batteries are not cheap & most LED lights that I come across are typically 1x AAA or 2x AAA, IE 1.5 or 3 V.
I was thinking about using this on my bike but the voltage is so high I am dubious about the likelihood of either over-driving the LEDs or just wasting power in creating the necessary voltage drop.
Can you spell out the reasons you selected 9V please.
Peter O

far.peter (author)peterlonz2010-03-24

i had a lot just lying around the house, you need at least 5 volts if not using a CMOS 555 chip.

Sunbanks (author)2009-11-28

Instead of using a 9 volt battery could you use three 3 volt batteries? 

far.peter (author)Sunbanks2009-11-28

yes, it just needs to be at least 5 volts.

far.peter (author)far.peter2009-11-30

mistake, you cant, but you can use 4 AA batteries

far.peter (author)far.peter2010-03-24

i must have been tired, you can :)

shadowkiller (author)2010-01-31

 Help! I need to use this circuit for a project. My led blinks too fast! I am using just a 100 ohm resister instead of a  variable resister. Is there something that I should change??? thanks

far.peter (author)shadowkiller2010-01-31

use higher resistance

shadowkiller (author)far.peter2010-01-31


Jodex (author)2009-12-02

Good, but this will be better if you'd change the word resistor to resistor not resister and if you'd have better pictures. And I personally would rather open and instructable spelled with a Big letter in the beginning of the name than with small letter. Okay that's me: D The schematic could also be drawen with computer. Sorry for all that nagging : D Good instructable, will really help someone who is starting with the 555s

Jodex (author)Jodex2009-12-02

Just some tips=)

far.peter (author)Jodex2010-01-26


luudvig (author)2009-12-20


andreblue (author)2009-12-03

i dont remember what the board your using is called.could you plz tell me

far.peter (author)andreblue2009-12-04

Its a breadboard, I got it from Abra Electronics.

far.peter (author)2009-11-24

sorry, i didn't have my tripod.

Kiteman (author)2009-11-08

Any chance of images in focus?

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