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Can radio waves be focused to a point using a phased array?

I've seen many examples of ultrasonic phased arrays being used with non-linear phase relationship between elements to concentrate all the power at a specific point, for example here:              ...
Christian's user avatar
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ULN2003 Used for security door magnets

I am building a project that will lock several cabinet doors using ULN2003AGP chips and security electro magnets similar to this: AGPtek® 60kg 130LBs Holding Force Electric Magnetic Lock This magnet ...
Hoytman's user avatar
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