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 ...
Millions of mobile phones will let off a loud 10-second siren as the UK prepares for Storm Eowyn. The 'Armageddon alert' will hit around 4.5 million devices at 6pm tonight (Thursday, January 23).
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