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Simple LED Flasher Circuit with 555 timer


LED Flasher/Blinking Circuit diagram Using 555 timer

Simple LED Flasher circuit

This is a Popular and Simple LED Flasher circuit using one 555 timer ic and some other components. 

This circuit works on the principle of Astable Mode operation of 555 timer. Which produces a continuous Pulse wave at the output on pin 3. When the pulse signal is High then one connection of LED gets positive supply through pin 3. and then again when Low output pulse produces then the negative supply goes to second connection of LED. 

When negative supply is given through pin 3 then the LED gets positive supply through directly VCC. And When positive supply given by pin no 3 then negative supply gets from the directly negative supply of battery. Therefore both LED connections to get continuous a positive and negative supply and Flashing according to the output of pin 3.

The speed can be changed by moving the preset R1 or changing the capacitor value of c1. 

You can arrange the LEDs as your own choices with different patterns. You can operate 10-12 LEDs easily without any issue with this circuit.


555 timer IC – 1

470Ω resistor – 2

10KΩ resistor – 1

Preset 100K – 1

Capacitor 10uf 25v -1 ,    0.1uf (104) -1

LEDs Minimum 2

About the Author


Hi, My name is Aman Bharti, I am interested in making and study of Electronics, circuit diagram, PCB designing and layout etc. I like to share the knowledge and all ideas with people which I get from My Experiment & from different sources. I try to provide any circuit details deeply with test results as possible. If you want to give a suggestion or comments on anything, please leave your comment in the comment box of the related page.

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