Cell Phone Jammer Circuit

Introduction to Cell Phone Jammer Circuit:

Our addiction to technological development has made it so that it is almost impossible to imagine a day without those amazing inventions.

Cell phones popular as mobile phones are the ones we cannot separate from the essential list. By now, they have become an inseparable part of our lives. Talking about a country like Nepal which has a low population (approx. 5 million), mainly two categories of cell phone carriers are available namely; NTC and Ncell. They use GSM 900 or 1800 systems. The systems have been upgraded to 3G recently. Like there is a bad side to every aspect, excessive use and ringing of mobile phones becomes annoying or disrupting at certain events. This might create serious issues in some places like conference rooms, law courts, libraries, and lecture rooms.

A device called “Cell Phone Jammer Circuit” comes in handy in such situations where one needs to stop this disrupting ringing and that device is named a cell phone jammer or ‘GSM jammer’ in technical terms, whose sole purpose is to inhibit the use of mobiles, i.e., make them obsolete. It is an electronic countermeasure device. There is a simple technology behind the entire concept of cell phone jamming.

Check out other phone/telephone related circuits posted on bestengineeringprojects.com

  1. Telephone Amplifier Circuit
  2. Add on Device For Telephone
  3. Telephone Converter Circuit
  4. Telephone Spy
  5. Phone Broadcaster Circuit

Working on Cell Phone Jammer Circuit

The jamming device broadcasts an RF signal in the frequency range reserved for cell phones that interferes with the cell phone signal, which results in a “no network available” display on the cell phone screen. Because of this, all phones within the effective radius of the jammer are silenced. Keeping aside the convenience of this device, it has been declared illegal in most countries. According to the Federal Communications Commission (FCC) in the USA;

“The manufacture, importation, sale, or offer for sale, of devices designed to block or jam wireless transmissions is prohibited”. However recently, there has been an increasing demand for portable cell phone jammers. We should mention that this project, presented in this report, is solely done for educational purposes. There is no intention to manufacture or sell such devices in Nepal, or elsewhere. In this project, a device that will jam both GSM 900 and GSM 1800 services will be designed, built, and tested.

cell phone jammer circuit

PARTS LIST OF MOBILE CELLPHONE JAMMER CIRCUIT

Resistors (all ¼-watt, ± 5% Carbon)

R1 = 250 Ω
R2 = 750 Ω
R3, R4, R6= 2 KΩ
R5 = 100 KΩ
R7 = 10 Ω
R8, R9 = 1 KΩ
R10 = 2 KΩ

Capacitors

C1, C3 – C7, C9 = 0.1 µF (Ceramic Disc)
C2, C15, C16 = 1nF (Ceramic Disc)
C8, C10 = 10 µF, 16V (Electrolytic Capacitor)
C11, C13 = 4.7 µF, 16V (Electrolytic Capacitor)
C12, C14 = 0.01 µ (Ceramic Disc)

Semiconductors

IC1 = NE555 (Timer IC)
IC2 = LM741 (Operational Amplifier)
IC3 = LM386 (Low power audio power amplifier )
IC4, IC5 = PF08109B (Power Amplifier Module for E-GSM and DCS1800)
IC6 = CVCO55CL (Voltage Controlled Oscillator, 925-970MHZ)
IC7 = CVCO55BE (Voltage Controlled Oscillator, 1785-1900MHZ)
T1 = 2N3904 (Smaller Signal Bipolar Junction Transistor)
ZD1 = 6.8V Zener Diode
D1, D2 = 1N4148 (silicon switching signal diode)

Miscellaneous

Antenna 1 = GSM antenna (Frequency = 850MHz-1GHz, Input Impedance = 50Ω, VSWR<2)
Antenna 2 = DCS antenna (Frequency = 1700MHz-1900MHz, Input Impedance = 50Ω, VSWR<2)

11 Thoughts to “Cell Phone Jammer Circuit”

  1. dushyant bhardwaj

    What does this -o +12v stands for
    If it is a battery, so did i need to buy all these batteries with values 12v, 2.4v. 3.5v, 5v and -12v. All of these are connected in one way only . So would you please inform me what does it mean ?
    E-mail- [email protected]

    1. Yes, these all are power supply unit, connected to the circuit.

      1. dushyant bhardwaj

        Sir,
        But how could be a power supply unit of -ve value there is one below IC2 of -12v.
        Is it the -ve part +12v. If yes then where to connect the -ve part of all other power supply unit

      2. dushyant bhardwaj

        Sir,
        Is -12 V power supply unit the negative part of +12 V power supply unit ?
        If yes, then where are the negative parts of the other power supply unit to be connected ?
        I could not get what to be done with this problem.

  2. dushyant bhardwaj

    Sir, I could not get IC PF08109B, CVCO55Cl, CVCO55BE. will radio antennas work correctly for it ? Can you help me out or refer any link so that i can get them.
    I visited lajpat rai market delhi to buy all components.

  3. Shahnawaz ahmad

    What is its range

    1. The range is about 10 meters and can be increased by using amplifier circuit and larger antenna.

  4. Mozahid Hossain

    Please send me the explanation of working principle of this circuit.

  5. Mozahid Hossain

    Please send me the explanation of working principle of this circuit. My email is-
    [email protected]

  6. mozahid hossain

    please send me the working principle of this circuit.
    [email protected]

  7. Imran abbasi

    Please make surcit digram more clear not clear components points in this surcit

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