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Make this Police Strobe Light Circuit

Last Updated on January 15, 2025 by Admin Leave a Comment

When we power this police strobe light circuit it produces the familiar strobe light effect seen in police cars.

How We Achieve the Effect

To create this effect we use two sets of lights, specifically LEDs that activate alternately. When one set is on its corresponding LED flashes three times. Then the other set activates and follows the same pattern. This process continues indefinitely.

This flashing effect is similar to strobe lights often used in dance halls.

Circuit Functionality

Our circuit utilizes a 555 timer in conjunction with a 4017B decade counter. By adjusting the resistor and capacitor values connected to the timer we can change the clock speed. The default values allow the circuit to function effectively.

The 4017B outputs a high signal level sequentially across its outputs. We connect outputs 0, 2, 4, 5, 7, and 9 for our setup.

This connection enables the diodes to flash as each group of LEDs is activated.

It's important to note that outputs 1, 3, 6, and 8 are not connected. These outputs determine the duration for which the display LEDs remain off.

We connect the first group of LEDs to outputs 0, 2, and 4, while the second group connects to outputs 5, 7, and 9.

Police Strobe Light Circuit

Parts List

ComponentDescription
IC1555 timer
IC24017B decade counter
Q1, Q22N2222 or 8050 transistor
D1 to D61N4007 diodes
D7 to D18RED 5mm LEDs
R11K resistor
R222K resistor
R3 to R10470 ohm resistors
C12.2uF/25V capacitor
C20.01uF ceramic disc capacitor
Power Supply12V DC supply or battery (B +)

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Tagged With: Light effect

About Admin

Hey friends, Thanks a bunch for stopping by this site! I am an engineer with a Bachelor of Engineering in Electronics and Telecommunication. One of my passions is gathering information from all sorts of electronics books and tutorials. I then take that information and compile it into a language that is super easy to understand. My goal is to make those complex electronics circuit concepts and technical terms much more accessible for all the new and budding electronics engineers out there. I can also design customized circuit diagrams as required by the users.
If you have any questions related to this field, please do not hesitate to drop a comment! I am always here and ready to help you out with any queries you might have. I cannot wait to hear from you!

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