How to make a Siren Sound Generator Circuit

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Introduction

Sounds are part of the life of every normal being. It gives a person different feelings. For instance, if you’re somewhere and hear a fire siren, it puts you in a situation to leave that place. If you hear an ambulance, you pray for the health of a person, if you hear the police siren, you get the knowledge that something inhuman happens in your area.

Thus, designers make these sound generator circuits. But, what if you get four unique sounds in a single circuit? For this, in this tutorial, we are going to see How to make a Siren Sound Generator Circuit – 4 Sounds.

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https://www.youtube.com/watch?v=B4Sty3xRCEM

Hardware Components

The following components are required to make Siren Sound Generator Circuit

S. no	Component	Value	Qty
1.	Sound Generator IC	UM3561	1
2.	Potentiometer	100K	1
3.	Transistor	2N3904, 2N2222	1
4.	Four Siren Sound Generator PCB	JLCPCB	1
5.	Push button	–	3
6.	Loudspeaker	8 Ohms	1
7.	Resistor	100K, 150K	2
8.	Terminal Block Connector	3.5mm	1
9.	DC Battery	3V	1
10.	Jumper wires	–	As per need

UM3561 Pinout

For a detailed description of pinout, dimension features, and specifications download the datasheet of UM3561

2N3904 Pinout

For a detailed description of pinout, dimension features, and specifications download the datasheet of 2N3904

Siren Sound Generator Circuit

Working Explanation

In this Siren Sound Generator Circuit, we are using IC UM3561 having 8 pins. The IC can bear the supply from 3V to 5V and provides an output range from -3V to +3V. The supply provides a bias to the complete circuit. A Zener diode is also there to regulate the battery voltage. Pin 1 and 6 of an IC are select line pins that are connected with a push button. We wired oscillator pin 7 with a variable resistor. The variable resistor is there to maintain the oscillation. We connect the output pin to the 8Ω speaker through the NPN transistor.

When you press Switch 1 (S1) a sound will generate when you press Switch 2 (S2) the other sound will generate, and when you press pin 3 another speaker makes another sound at the output. When you press no switch, there would be another distinct sound. Hence, the circuit can make four unique sounds.