Mobile phone detector

Indian Institute of TechnologyHyderabad MOBILE PHONE DETECTOR BY-AKSHAY.A.JADHAV es12b1004... This project is a simple cell phone detector project.. This handy cell phone detector, poc

Indian Institute of Technology

Hyderabad

MOBILE PHONE

DETECTOR

BY-AKSHAY.A.JADHAV

(es12b1004)

This project is a simple cell phone detector project This handy cell phone detector, pocket size mobile transmission sniffer can sense the presence of an active cell phone in a radius of 1m-1.5m

As the cell phone sends or receives a message or call, it sends off a signal This signal is detected by our circuit and will cause the LED to blink and buzzer to sound This is the basic principle of the project

This simple circuit can detect any cellphone activities like sending or receiving calls or SMS, or any type of data transmission

Circuit Diagram :

Working :

The transmission frequency of a mobile ranges from 0.9GHz to

3GHz.So a circuit capable of detecting gigahertz signals is needed

So we use a disk capacitor C4(220nF), which will capture the signals from the active cell phone transmission The disk capacitor along with its leads form a small gigahertz loop to catch the signals

The IC CA3130 is an op-amp, that is used in this circuit as a current to voltage converter The capacitor C4 leads are the input for the IC1

The IC1 provides the base voltage to the transistor Q1

Capacitor C5 (47pF) is connected across ‘strobe’ (pin 8) and ‘null’ inputs (pin 1) of IC1 for phase compensation and gain control to optimize the frequency response

As the capacitor C4 receives the signal, the output of IC1 becomes high and low alternately depending on the frequency of the signal This triggers the timer IC2 through capacitor C6 and the LED starts blinking and the piezoelectric buzzer starts sounding due to the

timing components R5(10k) and C7(47uF) which set the ON time to

1 second

Uses :

1)It can be used to avoid the usage of mobile phones in examination halls, seminar halls, quizzes etc

2)It can be used to avoid video transmission in a secret or private meeting

3)It can be used for military and civil defense purposes to detect mobile phones by increasing its radius of range

4)It can be used in hospitals and airplanes where, mobile signals interfere with the electronic equipment which may have fatal

consequences

And many more uses…

THANK YOU!