A cell phone jammer is an electronic device that blocks signal transmission between a cell phone and a cell tower. By using the same frequencies as cell phones, signal jammers can cause strong interference with communications between callers and receivers. Can effectively block signal transmission from networks such as UMTS, 3G, CDMA, GSM and PHS.
DIY Cell Phone Jammer - Components Required
| COMPONENT | COMPONENTUSAGE |
| Resistor R1 | Emitter Loading |
| Resistor R2 | Base Biasing |
| Capacitor C1 | Frequency Generation |
| Capacitor C2 | Feedback |
| Capacitor C3 | Feedback |
| Capacitor C4 | Noise Reduction |
| Capacitor C5 | Coupling |
| Capacitor C6 | Coupling |
| Capacitor C7 | Decoupling |
| Transistor Q1 | Amplification |
| Inductor L1 | Frequency Generation |
For any jammer circuit, there must be three important sub-circuits:
- RF amplifier
- Voltage Controlled Oscillator
- Tuning circuit
These 3 circuits combine to form an efficient cell phone jammer circuit.
Cell phone signal jammer working
The RF amplifier circuit consists of transistor Q1, capacitors C4 and C5, and resistor R1. Its main function is to amplify the signal produced by the tuned circuit. Once amplified, the signal is then directed to the antenna through capacitor C6. This capacitor effectively blocks any DC current, ensuring that only the AC component of the signal is transmitted.
Once transistor Q1 is activated, the tuned circuit located at the collector is activated as well. Composed of capacitor C1 and inductor L1, this circuit acts as a zero resistance oscillator, generating highly amplified frequencies with minimal damping.
As the inductor operates, the magnetic charge it carries gradually diminishes, resulting in the capacitor being charged with an opposing or reverse polarity. This pattern is repeated, and after a certain period, the inductor charges the capacitor until it becomes completely discharged.
The continuation of this process is halted when internal resistance emerges, causing oscillation to cease. Capacitor C5 facilitates the transmission of the RF amplifier feed to the collector terminal, followed by C6. Capacitors C2 and C3 generate random pulses (noise) at the frequency produced by the tuned circuit.
Amplification of the frequencies produced by tuned circuits is achieved through the use of RF amplifiers. These amplifiers combine and amplify the frequency generated by the tuned circuit with the noise signal generated by capacitors C2 and C3, and subsequently transmit it.
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