Annoy your friends or co-workers with this high-tech practical joke.
Thanks go to Brad Graham and Kathy McGowan for the original article in MAKE, Volume 14.
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Check out the complete Evasive Beeping Thing article in MAKE, Volume 14 and you
can see that in our Digital Edition.

Here is a link for the corrected schematic.
Use it rather than the schematic in the PDF or article.