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Tuesday, July 21, 2020

How to make a Siren Generator (Ambulance, Police, Fire Engine & Gun Shots)

    In this post, I will show you how to make Siren generator for generating sounds of Police Siren, Ambulance, Fire Engine & Machine Guns Shots

If you prefer video mode please click here to watch it on YouTube

Parts Required
  • 1 * UM3561 IC
  • 1 * 2N2222 NPN BJT Transistor
  • 1 * 47uF Electrolytic Capacitor
  • 1 * 10K Ohm & 220K Ohm Resistor
  • 1 * 2 Way & 3 Way Switch
  • 1 * Small Speaker
Theory

    This project is based on the IC UM3561 which is a low power CMOS LSI. The UM3561 are usually found in Toys and they are also used in some of the alarm applications. The UM3561 generally operates between 2.5 to 3.5 Volts and can generate 4 different sirens (Ambulance, Police, Fire Engine & Gun Shots) based on the selection of the switch combination.

    The 2N2222 NPN BJT Transistor is used to drive the speaker and the two switches are used to select the siren output.

Circuit Diagram

    The circuit diagram for all the siren remains the same only thing changing is the switch position
    
    Ambulance - SW1 is open & SW2 is closed
    Fire Engine - SW1 is pointed at Pin 6 & SW2 is open
    Gun Shots - SW1 is pointed at Pin 1 & SW2 is open
    Police Siren - All the switches are open

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