Instructables
Picture of LED flashing circuit
I will show you how to make a LED circuit that make LED flash at different intervals depending on the capacitor size.
 
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Step 1: Materials

Picture of Materials
What you will need:
-Soldering iron
-Solder
-Wire
-2 1kilo-ohm resistor
-1 110 ohm resistor
-1 10 to 1000 uf capacitor
-Perf board
-1 or more LED's
-1 555 timer
-1 9volt battery clip
-1 9volt battery

Step 2: Scematics

Picture of Scematics
LED 555timer schematics colors.bmp
Here are schematics the red in the color one is for positive.
You can put a capacitor of diferent sizes depending on how fast you wan it to flash.
Ex:A 10 uf cap will flash really fast but a 1000 realy slow,I would suggest a 330 uf cap.

Please don't hate it was done in paint.
P.S. It's 10 to 1000 uf capacitor.

Step 3: Finished product

Picture of Finished product
Now that you done soldering the component on the perf board your circuit should resemble like this one.
randofo6 years ago
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haaglm11 months ago
could you use a potentiometer in place of the capacitor to make the speed at which it flashes adjustable
firefly7621 year ago
@deepuelmil: Anything is possible without perf board, it just makes it easier to organize your components and it looks nicer than a tangled mass of wires :P

My question: about what size capacitor would cause the LED's to flash at approx. 1Hz (aka on/off cycle takes about a second to complete)?
deepuemil1 year ago
is it possible without a perf board
can you give the clear picture of step 3 without any labels!
thank you soooo much :)
this was a great help !
netfreak112 years ago
This circuit is really good and way better. . .
One thing I want to ask is that if I want to use the same circuit for having my LED turned on for 1 second and having the same LED turned off for 1 second as well for indefinite period of time then what valued capacitor or resistor etc should I use?
robotmaker2 years ago
also from the circuit you left pi4 trig un-connect shouls always pull high or it will re-trigger
Ghost9153 years ago
I found your schematic and it's just what I was looking for but, I found that by touching the top of the 555 timer chip it turns it on and off and controls the flashing. Is this suppose to happen?

Thanks
yes ,thats capacitance from your finger
callones3 years ago
Tries this and it works well. what if i want it to have a lower duty cycle? what do i need to change?
robot13983 years ago
i have made it and it works great.
i used a 100 uf capacitor
my led just lights up but doesn't flash/blink at all.....please advice.....
tomx633 years ago
my experience with this type of circuit is that the on/off intervals are equal in length. do you know how it can be accomplished to increase the off interval? say so that the LED blinks quickly once every 3 seconds.
and great job with this instructable!
tomx63 tomx633 years ago
figured it out over the weekend. the combination of capacitance and resistance (excluding the LED resistor) tweaks the IC to set the desired flash intervals.
y2knemesis4 years ago
 hi,
    i wanted to know,what capacitor should i use to make the light blink like 60 times a minute and the reistor needed to use on a 12v supply.thanx.great work keep it up.
steven123654 (author)  y2knemesis3 years ago
look it up on the net there is lost of post on the 555 and formulas for the timing
LastDevil5 years ago
Sorry for this dumb question but what will i need to make it a 12v input power?
steven123654 (author)  LastDevil3 years ago
you shouldn't have to change anything
steven123654 (author)  LastDevil5 years ago
Change the resistor between the 555 and the LED to a higher value, 1k ohm is safe.
tacoman1013 years ago
Hi, I so if I use a 3V source to power a led will I need the 1k resisters?
steven123654 (author)  tacoman1013 years ago
No you shouldn't but I don't think the 555 will work under 5volt look up on a data sheet
max1zzz4 years ago
 if i replace the led with a transistor could i use it to turn stuff on and off
steven123654 (author)  max1zzz3 years ago
yes
brettboy014 years ago
what capacitor would i need for it to blink 20 times a second because my friends halucinate when i flash lights in their eyes
One.4 years ago
i love making these! also, its called a multivibrator
jamilm94 years ago
I just made this in 10 minute. It turned out great. Thanks 
matstermind4 years ago
does it matter what voltage the capacitor is?
"mam?
I am curious, I was wondering how to make a circuit with 4 lights, in which only one light would light up at a time and go in order from one, two, three, four, and then back to one. Also, is there a way to adjust speed on that and do the same thing with 8 or more lights?
fkuk6 years ago
what capasitor do i need to make it flash slower about once every 5-10 seconds
did he say 10uf to 1000uf or 10uf to 330uf?
steven123654 (author)  fkuk6 years ago
you would have to try and see but it think higher then 300 microfarad should do but not sure.
ak116675 years ago
hey i was doing some tinkering with this circuit learned by using a 100microfarad cap and a 10k potentiometer by upping the resistance you can modify the length and duration of the blinks you replace the 2 1k ohm with the pot and it will blink according to the pot
Haven't tried it yet. But this is really useful idea, just what I wanted to find for making very simple cheap flashing light effects for sci-fi props (maybe accessories for a costume party or parade). I think I already have what I need except for 555 timers. For me, this level of Instructable is fine. Thanks!
steven123654 (author)  armadillozenith6 years ago
I will soon be posting a project that uses the same circuit but with a relay for higher voltage,that may be useful for your props.