Police Siren Circuit using 555 timer IC – Breadboard Tutorial

Police Siren Circuit using 555 timer IC – Breadboard Tutorial
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Police Siren Circuit using 555 timer IC – Breadboard Tutorial

Introduction

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.

For this tutorial you will need the below components.

For India

You can buy whole kit from here - Electronics Kit DIY Components
(You can get some components from the market, but I will recommend you to have the above kit as has all basic necessary items for begineers)
Mini Breadboard - 1
9V battery - 1
Wire Stripper - 1
Battery Snapper - 1
Nose Plier - 1
555 timer IC - 2
68K Resistor - 1
1K Resistor - 1
10K Resistor - 3
10uf Capacitor - 2
100n capacitor - 2
Speaker - 1

For USA

You can buy all in one 555 timer kit from here - Electronics Kit DIY Components
(Some items may not be present in the above kit, but still I will recommend it buying since we will be doing a lots of 555 timer IC projects in upcoming tutorials. You will need a kit like this to learn.)
Mini Breadboard - 1
9V battery - 1
Wire Stripper - 1
Battery Snapper - 1
Nose Plier - 1
555 timer IC - 2
68K Resistor - 1
1K Resistor - 1
10K Resistor - 3
10uf Capacitor - 2
100n capacitor - 2
Speaker - 1

(Note : You can check my previous tutorials on 555 here)

Click on the below chapter to start off with the tutorial.

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