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naveednoul Post subject: Cell Phone Jammer Circuit Design is so
simple Posted: Thu Sep 22, 2005 5:53 am Captain Joined:
Wed Sep 21, 2005 3:40 am Posts: 10 Location: Islamabad,Pakistan.
I would like to explain the design of cell phone jammer.Cell phone
is actuelly a two way radio i:e we can send and receive signals of different
frequencies.The all you need to design is: VCO (Voltage Controlled
Oscillator) 1650 – 2050 MHz TL074 Quad Opamp 78L05 Voltage
Regulator 9 Volt Power Supply Here you will generate the radio
waves using VCO and apply that output signal to operational amplifier
to amplify that signal.A voltage regulator is used which controls the
operation of oscillator circuit and 9v power supply is used to operate
our final circuit.When the waves are generated and amplified,you will
need a small antenna which transmits these waves in the range of 60-80
meters.When any one enters in this range and he receives a call whose
frequency is inbetween 1650-2050 MHZ,our generated signal and origional
signal collide and cancle power of eachother. So no input is detected
by cellular. No service message is always there on that cellular.
NOTE:You can also block any FM radio but you need an oscillator which
generates waves in range of 88-108 MHZ. Design It and Enjoy
Naveed Nawaz B.E(Telecommunication) Hamdard University
Karachi, Islambad Campus,Pakistan. Top kanling
Post subject: Posted: Thu Sep 22, 2005 9:35 am Colonel
Joined: Mon Jul 18, 2005 4:31 pm Posts: 32 Location: Baltimore,
MD Anybody else think that Naveed is now on the list?
Top Todd Post subject: Posted: Thu Sep 22, 2005 11:49
am But at what point do we soak our hands in acid? Top
kpainter Post subject: Posted: Thu Sep 22, 2005 12:35 pm
Colonel Joined: Wed Aug 20, 2003 11:47 am Posts:
47 Location: Santa Barbara, CA Wow, I didn't know a TL074 opamp
could be used in the 1650-2050MHz band!! Thats one good opamp!! Sheesh!
Posted 11/12/2012
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