Flashing LED Circuit using 555 timer ic

A Circuit that flashes an LED on and off. 

Overview 

This circuit uses the 555 timer in an Astable operating mode which generates a continuous output via Pin 3 in the form of a square wave. This turns the LED (D1) on and off. The speed at which the LED (D1) is turned on and off is set by the values of R1 and R2. 

Schematic 


Guys ,check out the follwoing video for its working:
http://www.youtube.com/watch?feature=player_embedded&v=bJa0oiV6B24

Astable mode will be discussed in the session.
for further queries,comment below