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schematic diagram of signal blocker and its display message

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vic_chaos_182

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ahm, hi is anyone can help with my problem??

im trying to make a project for our school. its all about how to block a signal from a specific place such as library.And as the person enter, it will display a message banner on the screen of the cellphone like "WELcome to the library".
can anyone can help me to solve this problem??

can i use a band pass filter with it>??

pls show me a schematic diagram about this project.. ^^

tnx for the concern...:D
 

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