how to make cell phone jammer at home pdf

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Remark errors or corrections discovered for this circuit, and get the prospect to win huge!

Mobile phone jammer is an digital gadget that blocks transmission of indicators between a cellphone and a base station. By utilizing the identical frequency as a cellular handset, the cellphone jammer creates robust interference for communication between the caller and receiver. It’s efficient in blocking transmission of indicators from networks together with UMTS, 3G, CDMA, GSM and PHS.

Cellphones function at totally different frequency bands in several international locations. For Canada, the 1900 MHz band is the first band, notably for city areas. 850 MHz is used as a backup in rural areas. USA makes use of 850 and 1900 MHz bands, relying on the realm. Europeans have a tendency to make use of the GSM 900 and 1800 bands as normal. Center East, Africa, Asia and Oceania additionally use these frequency bands. In Russia and another international locations, native carriers have licenses for 450 MHz frequency to offer CDMA protection.

Studying: the best way to make cellphone jammer at house pdf

The usage of totally different frequencies makes it troublesome to have a jammer for all frequencies. Nevertheless, the under talked about method can be utilized to calculate the required values.

F= 1/ (2*pi*sqrt (L1*C1))

Relying on the frequencies you should block, the values ​​of the inductor (L1) and capacitor (C1) could be altered.

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For instance, if cell phones at your space work at 450 MHz, you should generate 450 MHz with some noise to behave because the blocking sign. Now the cellphone receiver will be unable to grasp, which sign to obtain. We have now efficiently blocked cellphone indicators.

Right here, 450MHz is the tuning frequency. Mobile phone jammers for different frequency ranges are designed equally. Nevertheless, the sign vary could be very weak. Thus, this circuit works just for a variety of 100 m.

Cell Telephone Jammer Circuit

Cell phone jammer circuit


For any jammer circuit, it is important to have three vital subcircuits.

  • RF amplifier
  • Voltage Managed Oscillator
  • Tuning circuit

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These 3 circuits, when mixed collectively type an environment friendly cellphone jammer circuit.


  • RF amplifier circuit consists of the transistor Q1, capacitors C4, C5 and resistor R1. This RF circuit amplifies the sign generated by the tuned circuit. The amplified sign is given to the antenna by means of capacitor C6. It blocks DC and permits solely the AC element of the sign to be transmitted.
  • When transistor Q1 is turned ON, the tuned circuit on the collector turns ON. The tuned circuit consists of capacitor C1 and inductor L1. This acts as an oscillator with zero resistance. It produces very excessive frequency with minimal damping.
  • When the circuit is ON, voltage is saved within the capacitor. As soon as the capacitor is totally charged, it permits cost to movement by means of the inductor. When present flows by means of the inductor, it shops magnetic power similar to the voltage throughout the capacitor. At a sure level, the inductor reaches its most and the cost or voltage throughout the capacitor turns to zero.
  • Now the magnetic cost by means of the inductor and the present costs the capacitor in reverse or reverse polarity. The method repeats and after some time, inductor costs the capacitor and turns into zero.
  • This course of runs until inner resistance is generated and the oscillations cease. RF amplifier feed is given by means of capacitor C5 to the collector terminal earlier than C6. The capacitors C2 and C3 generate pulses in a random style (noise) on the frequency generated by the tuned circuit.
  • The RF amplifier boosts the frequency generated by the tuned circuit. The frequency generated by the tuned circuit and the noise sign generated by the capacitors C2 and C3 is mixed, amplified and transmitted.

Elements Required COMPONENT USAGE Resistor R1 Emitter Loading Resistor R2 Base Biasing Capacitor C1 Frequency Era Capacitor C2 Suggestions Capacitor C3 Suggestions Capacitor C4 Noise Discount Capacitor C5 Coupling Capacitor C6 Coupling Capacitor C7 Decoupling Transistor Q1 Amplification Inductor L1 Frequency Era Be aware

  • This circuit can block indicators solely inside a 100 meter radius.
  • Utilization of this kind of circuits is banned and unlawful in most international locations.
  • This circuit can be utilized in TV transmission and distant managed toys.
  • If the circuit shouldn’t be working correctly, strive rising resistor and capacitors values ​​within the circuit. Use the method

F= 1/ (2*pi*sqrt (L*C)).

  • Energy provide for the circuit mustn’t exceed 3 Volts.

Extra fascinating initiatives can be found at: DIY Electronics Initiatives.

Be aware: The cellphone jammer is an untested prototype circuit and banned in a number of international locations. Holding in with these rules, we’d not have the ability that will help you out with the precise values.

This text was first revealed on 17 October 2017 and was just lately up to date on 30 November 2018.

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