How To Make Cell Phone Jammer At Home Pdf

Comment bugs or fixes found for this circuit and stand a chance to win big! A cell phone jammer is an electronic device that blocks signal transmission between a mobile phone and a base station. By using the same frequency as the mobile phone, the cell phone jammer creates strong interference to the communication between the caller and the receiver. It is effective in blocking signal transmission from networks including UMTS, 3G, CDMA, GSM and PHS. Mobile phones operate in different frequency bands in different countries. For Canada, the 1900 MHz band is the main band, especially for urban areas. 850 MHz is used as backup in rural areas. The United States uses the 850 and 1900 MHz bands, depending on the region. Europeans tend to use GSM 900 and 1800 bands as standard. The Middle East, Africa, Asia and Oceania also use these bands. In Russia and some other countries, local service providers have licenses for the 450 MHz frequency to provide CDMA coverage. However, the below mentioned formula can be used to calculate the required values.

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

Depending on the frequency you need to block, the values ​​of the inductor (L1) and capacitor (C1) can be changed. Top Q & AF For example, if a mobile phone in your area operates at 450 MHz, you need to generate 450 MHz with some noise to act as a blocking signal. Now the mobile phone receiver will not be able to understand the signal to receive. We have successfully intercepted the cell phone signal, here is the tuning frequency 450MHz. Cell phone jammers for other frequency bands are similarly designed. However, the signal range is very weak. Therefore, this circuit only works within 100 m. Cell phone jammer circuitCell phone jammer circuit Description: For any jamming circuit, it is essential to have three important subcircuits.

  • RF Amplifier
  • Voltage Control Oscillator
  • Regulator circuit
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Read more: ATV and Tractor Sliding Logs [The 360-Guide]These 3 circuits when combined together will form an effective anti-phone interference circuit. Working

  • The RF amplifier circuit consists of transistor Q1, capacitor C4, C5 and resistor R1. This RF circuit amplifies the signal generated by the tuning circuit. The amplified signal is fed to the antenna through the capacitor C6. It blocks DC and only allows transmission of the AC component of the signal.
  • When transistor Q1 is turned ON, the regulator circuit at the collector turns ON. The regulator circuit consists of capacitor C1 and inductor L1. This acts as an oscillator with zero resistance. It produces very high frequencies with minimal damping.
  • When the circuit is ON, the voltage is stored in the capacitor. When the capacitor is fully charged, it allows charge to flow through the inductor. When current flows through the inductor, it stores magnetic energy corresponding to the voltage across the capacitor. At a certain point, the inductor reaches its peak and the charge or potential difference across the capacitor turns to zero.
  • At this time, the magnetic charge through the inductor decreases and the current charged to the capacitor is in the opposite direction or opposite polarity. The process repeats and after some time the inductor charges the capacitor and becomes 0.
  • This process runs until internal resistance is generated and the oscillations stop. The RF amplifier power is fed through the capacitor C5 to the pre-collector C6. Capacitors C2 and C3 pulse in a random fashion (noise) at the frequency produced by the tuning circuit.
  • The RF amplifier boosts the frequency generated by the tuning circuit. The frequency generated by the tuning circuit and the noise signal generated by the capacitors C2 and C3 are combined, amplified and transmitted.
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Mandatory ingredients ELEMENT USING Resistor R1 Generator charging capacitor Resistor R2 Base bias capacitor C1 Frequency generating capacitor C2 Feedback capacitor C3 Feedback capacitor C4 Noise reduction capacitor C5 Coupling capacitor C6 Coupling capacitor C7 Decoupling capacitor Q1 Amplification capacitor L1 Note creating frequency

  • This circuit can only block signals within a radius of 100 meters.
  • The use of this type of circuit is prohibited and illegal in most countries.
  • This circuit is also used in TV transmissions and remote control toys.
  • If the circuit does not work properly, try increasing the resistors and capacitors in the circuit. Use the formula

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

  • The power supply to the circuit should not exceed 3 Volts.

More interesting projects are available at: DIY Electronics Project.Note: Cell phone jammer is an untested prototype circuit and is banned in some countries. If we comply with those regulations, we may not be able to provide you with accurate values. This article was first published on October 17, 2017 and recently updated on November 30, 2018.

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