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WelcomeWelcome

A Presentation on A Presentation on MOBILE DETECTORMOBILE DETECTOR

P.MonikaDepartment of Electronics,Seethalakshmi Ram swami

college,Trichy -2, India.

INTRODUCTIONINTRODUCTION

The circuit as a current to voltage converter with The circuit as a current to voltage converter with capacitor connected between inverting and non-capacitor connected between inverting and non-inverting inputs.inverting inputs.

The incoming and outgoing calls,sms and video The incoming and outgoing calls,sms and video transmission detect the mobile phone is kept in the transmission detect the mobile phone is kept in the silent mode.silent mode.

An ordinary RF detector using tuned LC circuits. An ordinary RF detector using tuned LC circuits. Disk capacitor to capture the RF signals from the Disk capacitor to capture the RF signals from the

mobile phone.mobile phone.

BLOCK DIAGRAMBLOCK DIAGRAM

VOLTAGE CONVERTORVOLTAGE CONVERTOR

INPUT

INPUT

 TRANSISTOR

 TRANSISTOR

 TIMER TIMER PIEZO

BUZZER PIEZO BUZZER

BLOCK DESCRIPTIONBLOCK DESCRIPTION

Voltage convertor:Voltage convertor: The mobile is in silent mode if any calls and msg The mobile is in silent mode if any calls and msg

comes the antenna received the signals and send the signal to comes the antenna received the signals and send the signal to voltage convertor. The input and the output is the given to voltage convertor. The input and the output is the given to transistor.transistor.

Transistor:Transistor: The output of voltage converter is the input of The output of voltage converter is the input of

transistor. The transistor amplified the signal and gives the transistor. The transistor amplified the signal and gives the output to 555 timer form the pin2.output to 555 timer form the pin2.

Timer :Timer : The monostable mode, the 555 timer acts as a "one-Shot” The monostable mode, the 555 timer acts as a "one-Shot”

Pulse generator. The pulse begins when the 555 timer Pulse generator. The pulse begins when the 555 timer receives a Signal at the trigger input that falls below a receives a Signal at the trigger input that falls below a third of the voltage Supply. The pulse width third of the voltage Supply. The pulse width modulation is the input of 555 timer. The stable modulation is the input of 555 timer. The stable pulse is the output of IC 555 timer.pulse is the output of IC 555 timer.

Piezo buzzer:Piezo buzzer:

Piezoelectricity is the ability of some material to Piezoelectricity is the ability of some material to generate an electric field or electric potential in response to generate an electric field or electric potential in response to applied mechanical stress. The output of the signal is given to applied mechanical stress. The output of the signal is given to piezo buzzer and the sound is on.piezo buzzer and the sound is on.

CIRCUIT DIAGRAMCIRCUIT DIAGRAM

CIRCUIT DESCRIPTIONCIRCUIT DESCRIPTION 0.22µF Disk capacitor(C3) along with the leads acts as a small 0.22µF Disk capacitor(C3) along with the leads acts as a small

antenna to collect the RF signals from the mobile phone. antenna to collect the RF signals from the mobile phone.

This capacitor creates a field, stores energy and transfers the This capacitor creates a field, stores energy and transfers the stored energy in the form of minute current to the inputs of IC stored energy in the form of minute current to the inputs of IC CA3130.CA3130.

Resistor R3 acts as a feed back resistor.Resistor R3 acts as a feed back resistor.

C5 is connected for phase compensation.C5 is connected for phase compensation.

Op-amp IC CA3130 converts the current to corresponding Op-amp IC CA3130 converts the current to corresponding voltage output.voltage output.

Capacitor C4 and resistor R1 keeps the non-inverting input (3) Capacitor C4 and resistor R1 keeps the non-inverting input (3) stable.stable.

Resistor R2 provides the discharge path for capacitor C4.Resistor R2 provides the discharge path for capacitor C4.

Depending on the signal frequency detected by the C3,output Depending on the signal frequency detected by the C3,output of the IC1becomes high and low alternatively, indicated by of the IC1becomes high and low alternatively, indicated by LED1 and beeping of buzzer.LED1 and beeping of buzzer.

Mono-stable timer IC2 is triggered through capacitor C7. Mono-stable timer IC2 is triggered through capacitor C7.

Capacitor C6 maintains the base bias of transistor T1.Capacitor C6 maintains the base bias of transistor T1.

R6 and C9 reduce time delay.R6 and C9 reduce time delay.

APPLICATIONAPPLICATION

o Mobile phone detect in Examination halls, Mobile phone detect in Examination halls, confidential rooms etc.confidential rooms etc.

o Detecting the use of mobile phone for spying Detecting the use of mobile phone for spying and unauthorized video transmissionand unauthorized video transmission

o Detect the information receiving mobile Detect the information receiving mobile phone even if it is in silent mode.phone even if it is in silent mode.

ADVANTAGESADVANTAGES

low costlow cost Easy to constructEasy to construct Simple circuitSimple circuit Suitable for Examination hall.Suitable for Examination hall.

Thank YouThank You