A Simple Flasher Light Circuit Diagram (Using IC 555)


Hey, in this article we are going to see a circuit diagram of a flasher light using IC 555. IC 555 is a very versatile timer IC and we can use it in the Astable Mode to create positive pulses that will flash or turn on/turn off the light connected to its output. It can be achieved by connecting a Resistor-Capacitor(RC) network with the IC.


Flasher Light Circuit Diagram


Here, you can see the circuit diagram of a single flasher light. In this circuit, you can connect two lights also. The procedure for connecting additional Ligh is described below.

Flasher Light Circuit Diagram using IC 555



List of Components Required


  • A 9V Battery or any 9V DC Power Source
  • An SPST On/Off switch
  • An IC 555 Chip
  • 1 Pcs 10uF Electrolytic Capacitor
  • 1 Pcs 0.01uF Ceramic Capacitor
  • 2 Pcs 1 Kilo Ohm Resistors
  • 1 Pcs 10 Kilo Ohm Resistors
  • 1 Pcs LED

Connection Procedure


  1. Connect pins 1 and 8 of the IC to the power source in series with the SPST switch. Pin 1 should be connected to the negative terminal and pin 8 should be connected to the positive terminal. And connected the switch with pin no 8.
  2. Short the pins 8 and 4 of the IC.
  3. Short the pins 6 and 2 of the IC.
  4. Connect a 10 uF electrolytic capacitor between pin 2 of the IC and the negative or ground terminal of the circuit.
  5. Connect a 10 Kilo ohm resistor between pins 6 and 7 of the IC.
  6. Connect pin 7 of the IC to the positive terminal of the power source through a 1 Kilo Ohm series resistor.
  7. Connect a 0.01uF ceramic capacitor between pin 5 of the IC and the negative or ground terminal of the circuit.
  8. Connect the positive terminal of the LED to pin 3 of the IC through a 1 Kilo ohm series resistor and the negative terminal of the LED directly to the negative terminal of the power source.
  9. Now, if you want to connect another LED that will turn on when the first LED will turn off follow this procedure: Connect the positive terminal of the LED to the positive terminal of the power source or Vcc through a series resistor of 1 Kilo ohm and the negative terminal of the LED to the pin 3 of the IC.
  10. Now if you want to flash any other type of light of high voltage and current then you can use a Relay. Connect the coil of the relay at the output or pin 3 of the IC and use its output NO NC terminals to control the high voltage and current light by using another high voltage power supply.


Operation and Working Principle


If your circuit has only one LED it will turn off and turn on within an endless cycle. That means it will flash like that ON-OFF, ON-OFF, ON-OFF,..........ON-OFF

But if your circuit has two LEDs they will flash alternatively. That means when one LED is turned off, the other LED will turn on. And they will flash like that.


The working principle of the circuit depends upon the RC network created by the 10uF capacitor and the 10 Kilo Ohm resistor and the 1 Kilo Ohm resistor which are connected to pins 2, 6, 7 of the IC.

If you use high-value components then the flashing time also be increased. And if you use very small value components then the flashing time also be decreased, which cannot be detected by the human eye. So it is recommended to use these component values shown in the above circuit diagram.


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A Simple Flasher Light Circuit Diagram (Using IC 555) A Simple Flasher Light Circuit Diagram (Using IC 555) Reviewed by Author on 7:00 am Rating: 5