Download MOBILE BUG - Indian Institute of Technology, Hyderabad

MOBILE BUG
0
By:
M. Pavan kumar(cs12b1025)
P.V.Sairam(me12b1027)
B.Naveen reddy(me12b1007)
Siva Krishna(cs12b1038)
Indian Institute of Technology
Hyderabad
CONTENTS
 INTRODUCTION
 CIRCUIT DIAGRAM
 PIN CONFIGURATION OF 1) IC CA3130
 PIN CONFIGURATION OF 2) IC2 NE555
 WORKING
 APPLICATIONS
 LIMITATIONS
 REFERENCES
INTRODUCTION
AIM:TO CONSTRUCT A CIRCUIT WHICH GIVES WARNING
INDICATION IF MOBILE PHONE IS USED IN CONFIDENTIAL AREAS
 WHAT IS AN ORDINARY LC CIRCUIT ?
 WHY ORDINARY LC CIRCUIT DOESNOT SUIT FOR CELL PHONE
DETECTOR CIRCUIT ?
 WHAT IS THE BASIS FOR THIS CIRCUIT ?
CIRCUIT DIAGRAM
PIN CONFIGURATION OF (1) IC CA 3130
PIN CONFIGURATION OF (2) IC NE 555 TIMER
WORKING
 0.22µF Disk capacitor(C3) along with the leads acts as a small antenna
to collect the RF signals from the mobile phone
 This capacitor creates a field, stores energy and transfers the stored energy
the form of minute current to the inputs of IC CA3130
 Op-amp IC CA3130 converts the current to corresponding voltage output
 Capacitor C4 and resistor R1 keeps the non-inverting input (3) stable
 Resistor R2 provides the discharge path for capacitor C4
in
 Resistor R3 acts as a feed back resistor
 C5 is connected for phase compensation
 Depending on the signal frequency detected by the C3,output of the IC1
becomes high and low alternatively, indicated by LED1 and beeping of buzzer
 Mono-stable timer IC2 is triggered through capacitor C7
 Capacitor C6 maintains the base bias of transistor T1
 R6 and C9 reduce time delay
APPLICATIONS
 It can be used to prevent the use of mobile phone in Examination halls,
confidential rooms etc.
 It is also useful for detecting the use of mobile phone for spying and
unauthorized video transmission.
 Range of the detector also plays a important role:
EXAMPLE will be explained
 It can detect the information receiving mobile phone even if it is in silent mode.
LIMITATION
RANGE OF CIRCUIT
 The prototype has only limited range of two metres.
 Exact location of mobile phone cannot be detected
REFERENCES
 www.google.com
 www.googleimages.com
 www.pdfmachine.com
 www.Wikipedia.com