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MOBILE PHONE DETECTOR AND JAMMER
By Sarathkumar.T Saravanakumar .P Sivakumar.S III-Year ECE
Abstract:- The basic principle behind this circuit is the idea of
using a Schottky diode to detect the cell phone signal. Mobile phone signal is in the frequency range of 0.9 to 3GHZ.
Schottky diodes have a unique property of being able to rectify low frequency signals, with low noise rate. When an inductor is placed near the RF signal source, it receives the signal through mutual induction. This signal is rectified by the Schottky diode.
This low power signal can be amplified and used to power any indicator like an LED in this case.
Introduction:- 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 components:-
• V1 = 12V• L1 = 10uH• R1 = 100Ohms• C1 = 100nF• R2 = 100K• R3 = 3K• Q1 = BC547• R4 = 200 Ohms• R5 = 100 Ohms• IC1= LM339• R6 = 10 Ohms• LED = Blue LED
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.
Applications:-This circuit can be used at examination
halls, meetings to detect presence of mobile phones and prevent the use of cell phones.
It can be used for detecting mobile phones used for spying and unauthorized transmission of audio and video.
It can be used to detect stolen mobile phones.
