A signal jammer is an electrical device that prevents signals from being transmitted between a phone and a base station. The cell phone jammer causes substantial interference for communication between the caller and receiver by using the same frequency as a mobile telephone. It effectively blocks signal transmission from networks such as UMTS, 3G, CDMA, GSM, and PHS.
If your area’s mobile phones use 450 MHz, you’ll need to create 450 MHz with some noise to function as a blocking signal. The cell phone receiver will now be unable to determine which signal it should receive. Cell phone signals have been successfully suppressed. The tuning frequency is 450MHz in this case. The architecture of cell phone jammers for various frequency ranges is similar. The signal range, on the other hand, is extremely limited. As a result, this circuit only has a range of 100 meters.
PNP transistor, Ceramic Capacitors, push button, enameled copper wire, inductor, resistors, soldering iron, soldering wire with flux, DC battery with clip, smartphone, vero board, and jumper wires are all required to complete the project.
The first step is to wire a 22nH inductor to the collector pin of the BF494 transistor on the Vero board. Next, connect the collector of the BF494 to the circuit’s Vcc with a 15nF capacitor. Insert the two 4.7pF capacitors in parallel between the transistor’s collector and emitter. Attach the base of the transistor to VCC with a 39K Ohm resistor and a 102pF capacitor.
Then, attach a 1uF capacitor between the transistor’s base and collector. On the transistor’s emitter, solder a 100K resistor and two 5pF capacitors in series from Vcc to GND. Connect the +ve connection of the DC Battery to a push button with a 5pF capacitor. Connect the 5pF capacitor to a 3m coiled copper wire antenna. Finally, turn on the circuit and hit the test button to see if it works.
This circuit’s operation is actually quite simple. The circuit emits signals in the same frequency ranges as mobile phone signals, causing interference and resulting in a DoS (Denial of Service) attack; the jammer denies cell phone users within range of the jamming device service of the radio spectrum.
That is all you need to know for you to be able to DIY your own signal jammer! Once you succeed, always remember to use it properly!