A cell phone or a circuit for a mobile jammer A jammer circuit is a tool or object that can stop mobile phones from receiving signals. A mobile jammer circuit is essentially an RF transmitter that transmits radio signals in the same (or a nearby frequency range) as the GSM communication.

In this project, you will get to know about important things and how to create two mobile jammer circuits, the first of which uses a 555 timer integrated circuit and the second of which is made of active and passive parts.

• Required Components 555 Timer IC
• Resistors – 220Ω x 2, 5.6KΩ, 6.8KΩ, 10KΩ, 82KΩ
• Capacitors – 2pF, 3.3pF, 4.7pF, 47pF, 0.1µF, 4.7µF, 47µF
• 30pF Trimmer Capacitor
• LED
• Coils 3 Turn 24 AWG, 4 Turn 24 AWG
• Antenna 15 Turn 24 AWG
• BF495 Transistor
• ON / OFF Switch
• 9V Battery

1. Operation

You have to built this circuit on a perf board, gave it power, and then placed a phone close to the circuit. Make sure that mobile phone, which has full bars on its display, was able to receive the majority of the signals before turning on the power.The phone’s signal bars started to get smaller as soon as I turned on the circuit, and eventually they stopped at one bar.

2. Circuit 2 analysis is simple and easy if you comprehend the circuit described above. Keep in mind that there are three main crucial circuits in any jammer circuit. The output of that circuit will act as a jammer when they are combined. There are three circuits.

• antenna booster
• oscillator controlled by voltage.
• tuning system.

The RF amplifier circuit is made up of the transistor Q1, capacitors C4 and C5, and resistor R1. The signal produced by the tuned circuit will be amplified as a result. The antenna receives the amplification signal through the C6 capacitor. Capacitor C6 will eliminate the DC and only permit the airborne AC signal to be transmitted.

The tuned circuit at the collector will become untuned when the transistor Q1 is turned ON.

The tuned circuit at the collector will turn on when the transistor Q1 is turned ON. The capacitor C1 and the inductor L1 make up the tuned circuit. With no resistance, this tuned circuit will function as an oscillator.

The very high frequency will be produced by this oscillator or tuned circuit with the least amount of damping. The tuned circuit’s inductor and capacitor will both oscillate at its resonant frequency.

The tuned circuit works in a very straightforward and simple manner. The capacitor stores the voltage in accordance with its capacity when the circuit is turned on. Capacitors are primarily used to store electrical energy. When the capacitor is fully charged, the inductor will be able to conduct the charge. Inductor, as We are aware that magnetic energy is stored in inductors. The voltage across the capacitor will decrease as the current flowing through the inductor stores magnetic energy, and eventually the inductor will be able to store all of the magnetic energy, leaving the capacitor with no charge.

The inductor’s magnetic field will weaken, and the current will charge the capacitor in an opposite-polarity or reverse-polarity manner. Once more, after a certain amount of time, the capacitor will fully charge and the magnetic energy across the inductor will be zero. Once more, the capacitor will charge the inductor before becoming zero. After some time, the inductor will eventually charge the capacitor to zero and turn into an oscillator.

The noise for the frequency produced by the tuned circuit is produced by the capacitors C2 and C3. Electronic pulses will be produced randomly by capacitors C2 and C3 (technically called noise).

The frequency produced by the tuned circuit, the noise signal produced by the capacitors C2 and C3, and the feedback or boost provided by the RF amplifier will all be combined, amplified, and transmitted to the air.

The 450 MHz frequency is where cell phones operate. Since the cell phone receiver won’t be able to distinguish between the signals it receives, we also need to generate 450Mhz frequency with some noise in order to block this 450MHz frequency.

By doing this, we can prevent cell phones from receiving a signal from the cell towers.

In order to block the actual cell phone signal, we created the 450 MHz frequency in the circuit shown above. The aforementioned circuit will function as a jammer to block the actual signal in this way.