This “obnoxious noise maker” called the “Ubnox-O-Phone” by its maker is a combination of a sound generator and Ruby Guitar Amp who’s schematic can be downloaded from their site. The whole project only cost $35 so it’s a pretty cheap way to annoy people. Check out the video at the link below.
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A noise maker? That’s unethical! I’d rather choose QuietRock soundproofing to cut out the noise!