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audio spotlight? Answered

any one know how to make one of those sound from ultra sound gadgets? I saw an instructable for a kit once but I can't find it. thanks in advance!

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Goodhart (author)2008-12-12

I am assuming you are making reference to this audio spotlight.

Does this US device help?

I don't really have much access to this technology (I have enough trouble building regular FM or AM demodulators. :-)

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