How to make the UM3561 siren sound generator


The UM3561intergrated circuit is based on a low-power CMOS LSI design. It is included programmed mask ROM to generate three siren sounds and machine-gun sound.[1][2] Its siren type depends on SEL1 and SEL2 pins voltage levels. The required voltages of IC playing modes are listed in table 1. The typical operating voltage is 3V and its operating voltage range is 2.4V to 3.6V.[1][2] IC operated by an RC oscillator and it needs to fix to the external resistor. The resister pins should be fixed in between OSC1 and OSC2 pins of the UM3561 IC.[1][2]

UM3561 Integrated circuit pin configuration

Figure 2 is the three sound application circuits. (1: Police Siren, 2: Fire Engine Siren, 3: Ambulance Siren)It has a three-position toggle (ON-OFF-ON) switch to select the siren sound and a sliding switch is used to power up the circuit. You can select a suitable type of switch according to your required application in your project. ( eg.you can use the Push-button switch for momentary situations)

UM3561 Siren Circuit Configuration

Required item list for this activity.
  1. 300KΩ (Orange, Black, Yellow,)  Resistors - 1
  2. 10KΩ (Brown, Black, Orange,) Resistors (or 1KΩ (Brown, Black, Red,) for loud sound siren out) - 1
  3. UM3561 (IC) - 1
  4. 8Ω, 0.5W Speaker - 1
  5. 2SD400 Transistors - 1
  6. 3 Pins mini SPDT Slide Switch / (ON/OFF)/suitable for breadboard - 1
  7. 3 Pins Single pole three-position toggle switch / (ON/OFF/ON) - 1
  8. Solderless Breadboard - 1
  9. 1.5Vx2, AA Type Battery Holder with Batteries - 1
  10. Jumper Wire - 1m
  11. Four Pin Header Strip (from Male Breakable Pin Header Strip) - 1
  12. Soldering Iron & Solder Wire (~20cm) - 1

Appendix:
  • Type of switches used in this circuit.

switches

  • Final UM3561 breadboard circuit image.

UM3561 breadboard circuit


Reference :
  • [1]: UM3561, Three Siren Sound Generator, Data Sheet, UMC corporation ( Unicorn Microelectronics). 
  • [2]: UM3561A Three Siren Sound Generator, Data Sheet, BOWIN ELECTRONIC COMPANY.

Thank you...



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