Picture of 555 FLASHER (1:1 cycles) & (as independent variable cycles)


some of my friends including me have made D.I.Y spot lights for our bicycles but as usual they got jealous watching other branded lights.
Why? Because those lights have a strobe function! lol
Each of my friends have made he's own light with different configuration housing, bulbs, batteries, operation voltage and amperage. So, I needed to build one circuit to fit in every light with no extra effort. Here is the answer, the 555 IC it's the perfect cheap choice and it will do the job for all the lights. Off course we can buy ready made ones and also cheaper but making your own from the scratch it's fun.
Also i would like to point out that the uses of these little things are endless. it can be a bicycle strobe light, christmas lights, car strobe light and so on. Just use your imagination!

A few words about the mighty 555 IC.

It can operate from 3VDC to 16VDC MAX. It can deliver 200mA output from pin 3 so it's ok to drive a few typical led.
Even so, 200mA it's the maximum output therefore the IC safer at MAX output, no good!A better solution is to use a transistor to deal with the LOAD driven from the 555 IC and let the second do it's job and by that I mean, the counting for the strobe operation.I'm not gonna go any deeper concerning the operation of the 555. There is plenty info out there if someone who is interested to learn everything about the 555's operation. My intention is to help the beginner to make his own 555 strobe with basic info with less confusion, I hope!I will be happy if I can help with this instructable.
So, lets get started...


frapedia (author) 2 years ago
thank you debsolom for the notis!
dabsolom2 years ago
I wanted to bring to your notice that the reset pin (pin No.4) has to be connected to supply terminal (+ve).
Its a very good circuit to play around with.
Thanks for the effort.
All the Best
Jude Absolom
agis682 years ago
very clever use of 555 timer for lower output, well presented
frapedia (author)  agis682 years ago
Thank you:)