HI
1. YES U CAN DO IT
2. ITS ILLEGAL IN MOST COUNTRIES AND NOT LEGALLY COVERED IN A FEW STATES.
NE WAYS WORTH TRYING......DO FOLLOWING...
A. GENERATE SQUARE WAVE
B. CONVERT INTO A SAW TOOTH WAVE.
C. FEED IT TO A VCO OF APPROPRAITE FREQUENCY RANGE AS PER GSM FREQ RANGE USED IN UR AREA.
D. INPUT TO A RF AMPLIFIER
E .....FEED TO ANTENNA
HERE U GO...................UR MOBILE JAMMER......
BEWARE NOT SO EASY TO IMPLEMENT...
DO LET ME KNOW IF U MAKE SOMETHING
Added after 19 minutes:
HI
FORGOT ONE THING
U VE TO ADD NOISE ONTO TRIANGULAR WAVE TO MAKE IT MORE EFFECTIVE