Technical

How make a mobile phone detector 

Mobile detector can sense the present of mobile phone form distance of one To two meter. 

Circuit diagram:-

    Fig:- circuit diagram of mobile phone                                 detector

Parts List (components) :-
                                            Things You need
1. IC  3130CA
2. LED (Light Emmiter Diode)
3. Battery ( 9 volt)
4. 1 k.ohm Resistor
5. 100 K. ohm Resistor
6. 2.2 M. Ohm Resistor (required 2 )
7. 47 uF Capacitor
8. 0.22 uF Capacitor
9. 100 uF Capacitor
10. BC548 Transistor
11. Breadboard or pcb


Working :-

                      When a mobile phone is active,  it radiates RF signal that passes through nearby space. The signal contains electromagnetic RF radiation from the phone. When the cell phone radiates energy in the form of RF signal and pass on the input of IC.  This is indicated by the flashing of LED. This circuit is applicable for 2G network , GPRS and network search. It does not detect 3G, WCDWA and HSDPA network signals so well. 

Application:-

                        It can be used to prevent use of cell phone in examination halls confidential rooms and petrol pump etc. 

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