Showing posts with label GSM. Show all posts
Showing posts with label GSM. Show all posts
Saturday, November 15, 2014
GSM CELL PHONE JAMMER CIRCUIT
This is Simple GSM Cell Phone Jammer Circuit Diagram. A “Cell Jammer” is just way of saying “Dirty Transmitter” which happens to transmit within the Cellular Phone Bands. Reality is, the dirtier the better. GSM Cell Phones works on 900/1800 Mhz frequency. GSM-900 and GSM-1800 are used in most of the world.
Circuit Diagram
Working
- The 555 timer [8 pin] IC simply makes a noise. It’s coupled via C4 [electrolytic] to modulate the MRF transistor oscillator. With C1 set at roughly 1/3rd, you will be close to 900 MHz. By sweeping the C1 trimmer capacitor, you can swing the output frequency from 800 MHz to 2 GHz with the transistor and values shown above.
- You could replace the 555 chip with an electret microphone and listen to yourself talk on a scanner, so the unit could easily couple as a UHF Bug.
- Instead of a single Tapped Coil, I’ve used two molded inductors for ease of construction. Values for C1, C2, L1 , L2 are critical for the frequency range.
- You might want to build the unit into a metal box, add an on/off switch in the batteries + line, and maybe even add a LED. Connect an old 800 MHz cell phone antenna to C5.
- Would you believe the whole thing can be built on top of the 555 IC itself when using surface mount components, and the lot will fit onto a nine volt battery clip. Output is reasonably good, although the current drain is a bit high, so a new 9 Volt battery will only run about an hour .
- This circuit works on 10-15 metres of range.
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