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1. DESIGN OF USER SPECIFIC INTELLIGENT CELL PHONE
JAMMER
Abstract:
In our day to day life, the usage of cell phones has increased enormously. Presently, cell
phones are regularly used by millions of people all over the world; because we can use a cell
phone from just about anywhere to talk to anybody, it is one of the greatest inventions for social
and business life today. Even though cell phones have many advantages it eventually arises
problems contribute to academic cheating, even aid in industrial espionage. It’s great to call
anyone at anytime. Unfortunately, restaurants, concerts and temples all suffer from the spread of
cell phones because not all cell phone users know when to stop talking. So at present, silence and
security are the need of hour in many places. This can be done by using cell phone jammers
which blocks all the signals. This paper describes the design of an enhanced technique for
jamming the cell phone signals.
Existing system:
In the existing system, cell phone jammers block cell phone use by sending out radio
waves along the same frequencies that cellular phones use. This causes enough interference with
the communication between cell phones and towers to render the phones unusable.
Proposed system:
In the proposed system, an intelligent cell phone jammer is designed to detect and disturb
the control process to prevent the establishment of speech channel. This method consists of
detecting the frequency of the control process. The frequency detection process consists of
selecting the frequencies with a power level greater than 33.01 dBm. As a second step and after
determining the frequency of the channel reserved for the control process, the system transmits
noise at the detected frequency. The microcontroller used here is AT89C51 Microcontroller.

2. Block Diagram:
Power supply
LCD
Key
AT89C51
Microcontroller
Hardware requirements:
 8051 Microcontroller with Power Supply
 Relay driver
 LCD
 Signal Jammer Circuit
 Key
Software requirements
 Embedded c
 Keil C Compiler
Advantages
Relay
Mobile
jammer
circuit

3.  Reliable and more efficient
 Reduced interference.