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Hello! I did my SWIM from this site: https://www.instructables.com/id/Imprint-Invisible-Sound-and-Radio-Waves-Onto-Your-/ and the amplifier from this site: https://www.instructables.com/id/Phenomenal-Augmented-Reality-Allows-Us-to-Watch-Ho/, used a 9V battery to power the amplifier and connected it to the SWIM. However, mine's didnt work. Can you please help me point out what I can do to accomplish it?
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