LED Strobe Light Circuit


ByAswinth Raj 15

Strobe Light Circuit

In this project let us develop an LED Strobe light circuit using the popular 555 timer IC. A strobe light or a stroboscopic lamp is one which can produce regular flashes of light. We are designing this circuit using a 555 timer for setting the delay between each flash and a high power LED light as the source of light. At the end of this project we will learn how to use 555 timers in monostable mode and how to calculate the delay for such a circuit.


Components Required:

The components required for this project is listed below

  1. 555 Timer
  2. High Power LED
  3. 10k Resistor
  4. 0.01uF,0.1uF Capacitor
  5. 10M Potentiometer (or 1M, 2M Resistors)
  6. Breadboard
  7. Connecting Wires
  8. 9V Battery


Strobe Light Circuit Diagram and Explanation:

Strobe Light Circuit Diagram

The complete circuit diagram is shown in the above image. You can either build them on a breadboard or solder them to a Perf Board. The explanation of the circuit is given below.


Circuit Explanation:

The heart of the strobe light circuit  is the 555 Timer which is operating in Monostable mode. The 555 Timer can operate in 3 different modes such as Astable, Monostable and Bistable mode.  All these three modes produce three different types of pulses which can controlled at a particular point. The Monostable mode produces pulses whose high state time can be set by giving a trigger at pin 2. The output(pin 3) of the 555 IC normally stays low, whenever the pin 2 is triggered the pin 3 will go high for a specific interval of time.

This delay can be controlled by changing the values of Resistor (Potentiometer) and the capacitor (C2) shown in the circuit. The formulae to calculate the delay is shown below


Where, resistance R is in ohms, Capacitance C is in Farads and Time is in seconds. I have used the resistor value as 1M ohm and capacitor value as 0.1uF to produce a delay of about 0.1 second.  You can change the delay by varying the potentiometer.


Circuit Simulation:

In order to further understand the working of this project. Let us try simulating the project using the Proteus software. Using the help of a DSO in Proteus we can visualize the pluses produced by the 555 Timer. You can download the Proteus design file from here.

After downloading click on play button and you should see the graph as shown in the below image.

Strobe Light Circuit Simulation

You can vary the resistor R2 and notice the Pulses getting varied based on the resistor value. This variation will affect how fast the LED turns on and off. The waveform is enlarged in the image below.

Strobe Light Project Waveform



Once the connections are given simply power the circuit using a 9V battery. You should notice your LED flashing. If it looks stable, it means that it is flashing so fast that it is not visible to the naked eye.  So gradually adjust the potentiometer to vary how fast it should flash. You can watch the video below for complete working of the project.


That is it we have a working of LED Strobe light setup. Hope you enjoyed the project and got it working, if not post your problems in the comment section and I will help you out. 


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  • HASSAN's picture
    Sep 26, 2017

    if we want to put 10watt LED than what changes we have to made

  • Aswinth Raj's picture
    Aswinth Raj
    Sep 27, 2017

    What is the voltage rating and current rating of the LED. I cannot help without knowing this

  • HASSAN's picture
    Sep 28, 2017

    10 watt and 12 volt LED will work,or you have another type of flasher circuit using 10watt and 12 volt LED ?

  • Vicky's picture
    Nov 19, 2017

    Hey Aswinth, can you help me guiding as if i want to run this circuit with 12 volts. What changes do i have to make. I cannot use 7805 as it will get hot.

    I am looking for the same flashing but with 12 volts.

    Please help.


  • HASSAN's picture
    Sep 29, 2017

    i have used all mention components above,but my LED is not Blinking,it is stable ? Please help me

  • HASSAN's picture
    Sep 29, 2017

    0.01uF,0.1uF Capacitor these are the 2 capacitors are use ? right ?

  • Aswinth Raj's picture
    Aswinth Raj
    Sep 29, 2017

    Yes the value of capacitors are mentioned correctly. 

    If you are facing problem, replace the resistor with a potentiometer and try varing the resistane, it should help

  • Ibelvb's picture
    Jan 01, 2018

    This circuit can freeze moving fan?

  • Aswinth Raj's picture
    Aswinth Raj
    Jan 02, 2018

    What do you mean by freezing a moving fan? I cannot understand your application!!

  • Vladimir's picture
    Jan 19, 2018

    Could you please explain to me where your constant in T= 1.1xCxR comes from?
    I’m very curious about this kind of stuff

  • AISHA's picture
    Jan 23, 2018

    Its given in the datasheet. You need to analyze the internal circuit of a 555 timer of you wanna know how they arrived to this formula 

  • Dr. Sreve's picture
    Dr. Sreve
    Mar 03, 2018

    I am interested in building a 430nm strobe that flashes at 250Hertz with a duration of 25 microsec/flash.
    Do you think the above design would work?

  • Aswinth Raj's picture
    Aswinth Raj
    Mar 05, 2018

    250Hertz? I doubt if that frequency is supported by 555... Oh yes it will use the datasheet , just use the formula and change the values 

  • Gary's picture
    Nov 27, 2018

    I like the Curcuit In the Video ,But You do Not mention anything on what Moffset or Voltage Reg. You used .... Can you please tell me ? 

  • Hiro_Hamada's picture
    Dec 06, 2018

    Follow the circuit diagram, there are no mosfets in the circuit and the whole circuit is powered by a 5V regulator from a 9V batttery  

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