This Project is based on Siren IC UM 3561 and transistor BD139

1. A Mini Project on
Electronic Bicycle Lock
S.Y.Btech-E&TC Engineering
ANALOG ELECTRONICS
By:
1.Rohit Mane
2.Abhishek Sainkar
3.Omkar Rane
4.Kaustubh Wankhede

2.  Introduction:
Objective Of Project-
To Design Intelligent Security System for
bicycle to prevent theft. Aiming to have more
efficient and affordable system

3. Literature Survey:
 Introduction
• A Bicycle lock -Physical Security Device used on a Bicycle to Prevent Theft
• The difficulty in preventing the Theft - Wheels are easily detachable. The most
secure locking method therefore is to lock the wheels and frame to each other and
to an immovable object
• Important Aspects- security, portability and cost
• The electronic bicycle lock described here is a worthwhile alternative for bicycle
owners who want to make their bicycles ‘Intelligent’ at reasonable cost
• Circuit can be used for virtually any make of bicycles.

4.  Existing
System Where
It Is Used?
•Bicycle User use this
System For Safety
purpose

5. Design:

6.  Components:
 1.IC UM3561
 2.BD139
 3.Speaker 8Ω 0.5 W
 4.Switch button
 5.Resistor 10kΩ,270kΩ
 6.Battery

7.  IC UM3561
 UM3561 features
• Four sounds can be selected
• Power on reset.
• Typical 3V operating voltage
• A magnetic speaker can be driven by connecting an NPN
transistor
• 8-pin DIP package form
 UM3561 is a low-cost, low-power CMOS LSI designed for use in
alarm and toy applications.

8.  BD139 – NPN Transistor
Features
■ Products are pre-selected in DC current gain
Application
■ General purpose
 Description These epitaxial planar transistors
are mounted in the SOT-32 plastic package.
They are designed for audio amplifiers and
drivers utilizing complementary circuits. The
NPN types are the BD135 and BD139, and the
complementary PNP types are the BD136

9.  Working
• IC um3561 generates multi siren tones , It can work down 2.4 V
• UM3561 is Siren Producing IC
• We are using Police Siren Configuration in which Sel1 pin is NC and Sel2 is
also NC
• BD139 is to drive the circuit and also used as trigger. The base and emitter
when they are shorted, alarm remains Off and after release Siren Starts its
function
• Pin 7 and 8 are oscillator pin. IC has internal oscillator which can be varied
by changing frequency
• We used Transistor As Switch
• Working Range (2 to 5 v)

10. Implementation
On Breadboard
Circuit

11.  Conclusion
Electronic Bicycle Lock is another better alternative to
bicycle owners to make their bicycle more secure and
intelligent.
This system of Circuit can be used in Alarm circuits
It can also be used as burglar alarm.

12. THANK YOU