Now let’s look at another interesting concept, for example: B. A cell phone or cell phone jammer circuit
Cell Phone Jammer Circuit Description:
This circuit analysis is simple and easy once you understand the above circuit. Note that there are three main circuits in any interference circuit. When assembled, the output of this circuit will act as a cell phone jammer. There are three apartments
Voltage controlled oscillator.
Thus, transistor Q1, capacitors C4 and C5, and resistor R1 form the circuit of the RF amplifier. This will amplify the signal produced by the tuned circuit. The gain signal is sent to the antenna through the capacitor C6. The capacitor C6 eliminates the direct current and passes only the AC signal in the air.
When Q1 is turned on, the collector tuned circuit opens. The resonant circuit consists of a capacitor C1 and an inductance L1. This resonant circuit will act as an oscillator without resistance.
This oscillator or resonant circuit produces a very high frequency with minimal damping. Both the inductor and the resonant circuit capacitor oscillate at a resonant frequency.
The operation of the resonant circuit is very simple and easy to understand.
When the circuit is open, the voltage is stored by the capacitor according to its capacity. The main function of a capacitor is to store electricity. When the capacitor is fully charged, charge can flow through the inductor. We know that inductors are used to store magnetic energy. When the current flows through the inductor, the voltage will therefore store and reduce the magnetic energy on the capacitor, at some point all magnetic energy will be stored by the inductor and the charge or voltage on the capacitor will be zero.
The magnetic charge through the inductor decreases and the current charges the capacitor with opposite or opposite polarity. After a while, the capacitor will be fully charged and the magnetic energy of the inductor will be completely zero. The capacitor recharges the inductor and becomes zero. After a while, the inductor charges the capacitor and goes to zero, it oscillates and produces a frequency.
This loop is built up to the internal resistance and vibration is stopped.
The RF amplifier is fed to the collector junction ahead of C6 through the capacitor C5 for amplification or as a gain signal for the tuned circuit signal. The capacitors C2 and C3 are used to generate noise at the frequency produced by the resonant circuit. Capacitors C2 and C3 randomly generate electronic pulses (technically known as noise).
The feedback or amplification of the RF amplifier, the frequency generated by the resonant circuit, and the noise signal generated by the capacitors C2 and C3 are combined, amplified and sent into the air.
The mobile phone operates at a frequency of 450 MHz.
To lock this 450MHz frequency we need to generate a 450MHz frequency with some noise which acts as a simple blocking signal as the cell phone receiver cannot tell what signal it is receiving. This allows us to prevent cell phone signals from reaching cell phones.
In the above circuit, we created a 450MHz frequency to block the actual cell phone signal. The above circuit acts as a jammer to block the actual signal.