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[1] USE A RF SIGNAL GENERATOR TO DETERMINE ITS RANGE. [2] IF IT WAS A RECEIVER ,NO NEED. AND NOBODY KNOWS YOU ARE USING IT.

Next one is ultra violet ray DVD because its wave length is even shorter than blue.

LM7812 good up to 1A.

Those cheap made converter did not have any voltage regulator. It is a simple capacitor filter out circuit that can reach 1.4 time higher voltage at the output while no load. That is why ..... 24 X 1.4 = 32V Add one LM7824 to the circuit to obtain exactly 24V.