Mobile jammer ckt

How is this supposed to work?

Firstly this is not an operable circuit. Needs some modifications. Secondly it works by generating high frequency noise in the same spectrum as the mobile signals, effectively jamming/scrambling them.

How it work?

Well you have to be familiar with the term interference. This little gizmo (which is not wired correctly BTW) emits a signal with the same frequency as the carrier for the GSM network thus interfering with, and effectively jamming the signal. About the how the circuit works. Well, all you need to make an oscillator is an amplifying device and a frequency determining positive feedback. The transistor (in a common base topology for example) is the high gain amplifying device and the frequency determining network is your LC tank circuit. The positive feedback is applied through the central tap of the two capacitors to the emitter of the transistor. Anyway your circuit is deeply flawed and will not work in this state. I suggest you search for transistor amplifying topologies and LC filtering for starters and then proceed to positive feedbacks and specifically colpitts oscillator, since it is mostly used at VHF, as it is the case with cellular networks (they work very high in the EM spectrum at >1.5Ghz. And lastly a friendly warning ⚠. These things are very hard to tune, are completely useless on a breadbord and need special attention in shielding. Moreover this type of technology is strictly prohibited in any modern country. I say, don't go there ;)

how is it work