It's a cool project, anyway, and I'm all down for that. A combination of cheerfully-coloured 3D-printed components and RC ...
For this project, instead of trying to quiet his blower, he decided to make one as loud as possible in the form of an air raid siren. The basic idea behind [Matthias]’ air raid siren is to make ...
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Cold War-era siren that warns of 'air raid' erroneously activates in Winnebago County"I could tell right away that the sirens didn't sound like the normal tornado siren. It had the up-and-down pitch of an air raid or an attack siren," added Behnke. That's exactly the tone Winnebago ...
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