This mini project discusses the design of an emergency alarm circuit using the low-cost IC UM3561, which can produce four distinct sounds for alarms. It outlines the circuit components and applications of fire and burglar alarms, emphasizing their importance for safety and security in various settings. The project also includes a bibliography of resources for additional information on alarm systems.

1. Mini project
on
Emergency alarms
Name of the group member:-
1.Anup kamal minz (Reg:-U10EE003)
2.Anupam kumar (Reg:-U10EE004)
3.Bishwarup mukherjee (Reg :-U10EE006).

2. INTRODUCTION
This circuit uses a low cost IC UM3561 that generates four different sounds
and can be easily added to alarm. This IC doesn't require any external
components if used with piezo buzzer. The output pin 3 of the IC and the
negative power supply can be directly connected to the buzzer.
This IC can generate the following sounds, when selection pins 1 and 6 of
the IC are connected as described below:
1)Police Siren: when pin 1 and 6 are not connected to any of the battery
terminals.
2)Fire Engine Siren :pin 6 connected to positive, pin 1 not connected
3)Ambulance Siren : pin 6 connected to negative, pin 1 not connected
4)Machine Gun Siren : pin 6 not connected , pin 1 connected to positive

3. CIRCUIT DIAGRAM
BASIC CKT:-
ACTUAL
CONNECTION:-

4. COMPONENT USED
REF PART TYPE PART NAME VALUE QUANTITY
Bat 1 BATTERY PACK Battery Pack 3V AA ---- 1
IC 1 IC IC 3561 3561IC 1
P1 POT Pot Meter 100K 100K 1
R1 RESISTOR Resistor 1K 1K 1
R2 RESISTOR Resistor 10K 10K 1
SP SPEAKER Speaker 8 Ohm 8Ohm 1
T2 TRANSISTOR Transistor BC547 547BC 1
T3 TRANSISTOR Transistor BC328 328BC 1
LIST OF PARTS USED IN THE PROJECT :-

5. MAIN COMPONENT SPECIFICATION
1) IC

6. PIN CONFIGURATION:-

7. POT METER 100K
With imperial standard shaft & bushings made to our rigid engineering
specifications. The potentiometers are full size - 24mm diameter types.
Power rating is 0.5W max. They have genuine 6.35mm (1/4") shafts with
a flat machined 25% of the diameter for grub screws or interference fit
knob mounting. The shaft is a generous 38mm long. The bush is a 3/8" 32
T.H.D. types which we believe is necessary for good fixing to a panel.
Another important feature of the pots is their PCB mount capability.
2)

8. TRANSISTOR
The BC547 transistor is an NPN Epitaxial Silicon Transistor. The
BC547 transistor is a general-purpose transistor in small plastic
packages. It is used in general-purpose switching and
amplification BC847/BC547 series 45 V, 100 mA NPN general-
purpose transistors.
3)

9. TRANSISTOR BC3284)

10. APPLICATION OF THE CKT:-

12. MAIN USES OF ALARM
Having fire alarm systems installed has its obvious advantages. People are
protected, even while they sleep, if a fire should occur. A fire alarm will alert
any and all individuals that a fire or the beginnings of a fire have been
detected, and people can safely leave the premises before losing life or limb.
Yet, there are other unseen and commonly unknown advantages to having a
quality fire alarm system installed in a building or home.
FIRE ALARM:-
A burglar alarm is a system designed to detect intrusion – unauthorized
entry – into a building or area. They are also called security alarms, security
systems, alarm systems, intrusion detection systems, perimeter detection
systems, and similar terms.
Burglar alarms are used in residential, commercial, industrial, and military
properties for protection against burglary (theft) or property damage, as
well as personal protection against intruders. Car alarms likewise protect
vehicles and their contents. Prisons also use security systems for control of
inmates.
BURGLAR ALARM:-

13. BIBLIOGRAPHY
http://www.wikipedia.org/ WIKIPEDIA.
http://electronicsforu.com.asp ELECTRONIC FOR YOU.
http://www.circuit-projects.com/ CIRCUIT PROJECT.
http://www.aaroncake.net AARON CAKE.
http://electroschematics.com/ ELECCTRON SCHEMATICS.