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πŸš“ Police Siren πŸš’ Fire Engine Siren πŸš‘ Ambulance Siren

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jonathanrjpereira/UM3561-Siren-Generator

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UM3561-Siren-Generator

Can play either a Police Siren, Ambulance Siren or Fire Engine Siren when triggered.

Full Video: Siren Generator

Order PCB: PCBWay

Electronic Components

Qty Component Buy
1 UM3561 AliExpress
1 BC547 NPN Transistor AliExpress
1 220KΞ© Resistor AliExpress
2 220Ξ© Resistor AliExpress
1 5mm LED AliExpress
1 SPDT Slider Switch AliExpress
1 SP3T Slider Switch AliExpress
2 2-Pin Male Header Pins AliExpress
1 Speaker AliExpress
1 AA Battery Holder (2 Slot) AliExpress
2 AA Battery AliExpress
Tools Buy
Soldering Iron AliExpress
Soldering Wire AliExpress

Working

UM3561:

The UM3561 is a low-cost, low power CMOS LSI designed for use in toy applications. Since the integrated circuit includes oscillating and selector circuits, a compact sound module can be constructed with only a few additional components. The UM3561 contains a programmed mask ROM to electronically reproduce alarm sounds.

Pinout Pin Description

  • Typical Operating Voltage = 3V
  • 8-Pin DIP Package
  • Power On Reset

IC Block Diagram IC Truth Table

Circuit:

Only one of the Siren tunes can be played at a time. This is determined on the basis of the position of the SP3T Slide switch. The switch has three positions which will connect the common terminal with VCC, GND or NC in order to fulfill the Truth Table.

Block Diagram

A dynamic speaker is driven with an external NPN transistor. A SPDT switch is used to turn the circuit ON & OFF.

Schematic

ContributingπŸ› 

Are you an engineer or hobbyist who has a great idea for a new feature in this project? Maybe you have a good idea for a bug fix? Feel free to grab our code & schematics from Github and tinker with it. Don't forget to smash ⭐️ & the Pull Request button.

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