Cell Phone Detector

This is a mobile phone detector circuit that can detect the signals being used in the GSM at about 900 MHz. Since the signals are digitally encoded, it can detect only the signal activity, not the speech or the message contents. A headphone or a set of speakers can be used to hear the detected signals.



Component List :-

• R1, R5 : 100K 1/4W Resistor
• R2, R6 : 1k 1/4W Resistor
• R3, R7 : 8.2M 1/4W Resistor
• R4, R8 : 220 Ohm 1/4W Resistor
• R9 : 2.2K 1/4W Resistor
• D1, D2 : BAT43 Schottky Diode
• C1, C2, C4 : 100nF Polyester Capacitor
• C3 : 100uF 16V Electrolytic Capacitor
• L1, L2 : See Text
• U1 : LM358
• J1 : 8 Pin Socket
• J2 : Stereo JAck
• 1 x 9V Battery
• 1 x 9V Battery Socket
• 1 x LED
• 1 x On/Off Switch

Download PDF :-
http://hotfile.com/dl/51762557/ad19726/Rishuploadz_mobile_phone_detector.rar.html