LED flashing using 3volts battey

[RED_eye]

hi guys can anyone help me to build this project??

i need to create simple led blinker using 2 led bulbs or 4 like blinker in a police cars.

like this one

i want to know what materials or chip should i use?

pls help me.i need it for my project..

 

[(*steve*)]

Check here. There's now a section on LED applications at the end which contains links to a heap of LED related circuits. You may find something there.

 

[RED_eye]

pls help me..

the link above is a sample only. i need to make 2 to 4 bulbs only for 3volts and small t o fit my project.pls guys help me...

 

[BobK]

http://wild-bohemian.com/electronics/flasher.html

Bob

 

[Harry Patrick]

a 555 timer is defo for this. Read about it. The formula for the frequency of output is simple. http://en.wikipedia.org/wiki/555_timer_IC You might however rneed 5v instead of three. This is minimum voltage for most of these chips. Use 9v bat

 

[poor mystic]

Hi
The LM3909 is the chip for this job, it beats the 555 hollow on all fronts. It doesn't appear to be mentioned in the sticky though.
The LM3909 LED flasher/oscillator runs down to 1V supply, and will flash an LED for more than a year on a single dry cell. Check out the datasheet and application notes from National Semiconductor: http://www.datasheetcatalog.org/datasheets2/15/152834_1.pdf