Police Siren Circuit using 555 timer IC - Breadboard Tutorial

Vivek Gupta
Vivek Gupta
Role : Writing free tutorials in free time
  • Website : http://vsgupta.in/
  • Experience : 5+ Years
  • Specialist in : IoT, NLP, Machine Learning, Chatbots, Voice Assistants, Hardware Engineering
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Police Siren Circuit using 555 timer IC – Breadboard Tutorial


We are going to make a Police Siren Circuit using two 555 timer IC. The circuit will produce an up-down wailing sound from the speaker. We will be using two 555 timer IC, so the circuit will be bit complex to make. We will fire first 555 is wired as a low frequency oscillator to control the voltage control pin 5 of the second 555. The voltage shift on pin 5 makes the frequency of the second oscillator to rise and fall. I will explain each step in detail with step wise execution and instructions of the circuit. If you are seeing this page directly then you can start from beginning here.

Bill of Materials

For this tutorial, you will need the below components. Make sure you are ready with them.



 Circuit Diagram

Keep the below circuit diagram handy. While making the breadboard connection, please check your connections with the circuit diagram. It will help you to avoid any errors on breadboard.




Follow the below steps in the video to make the full circuit.

 Breadboard Image

You can also use the breadboard image to cross check your connections on 555 timer IC on breadboard police siren circuit.



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Comments ( 6 )

  • Debraj mukherjee

    sir, i did exactly what was given in the vedio but my circuit could not produce
    the police siren sound
    i request you to please guide me in this

    • Can you post circuit image?

    • I already answered your question on youtube 🙂

  • Brock Wood

    Hi, Vivek! What is the impedance of the speaker used in your circuit? Thank you in advance! Thank you for posting this valuable information on the internet! – Brock

    • Sorry for the late reply. Its a generic 8 Ohm Speaker.

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