Youtuber Mark Makies has created a 3D printer air raid siren. This you probably know, if you viewed the video above (via Hackaday). What I'm not entirely sure of is why it sounds like both a ...

By ramping the speed of the motor up and down, it’s possible to vary the pitch of the siren as is often done with real air raid sirens. This action could be entirely automated if so desired.

KYIV, Ukraine — Air raid sirens warning of Russian attacks are a constant in Ukraine. Thousands of the alarms have presaged Russian air strikes over the past two years.

GREG MYRE, BYLINE: The air raid sirens warning of a Russian assault can go off any time or any place in Ukraine. One recently began to wail as a 28-year-old singer, Diana Oganesyan, was walking ...

Air Raid Siren: How This Technology Works The technology is expected to be used for the India’s mock drill siren remains unclear. However, globally, air raid sirens operate using various ...

First installed in the 1950s, they were developed for Cold War air raid warnings, but in the 1970s, the sirens transitioned to outdoor warning alerts.

I am the third type of person, who hears a 3D-printed air raid siren and experiences a flash forward to my apocalyptic future yet to come. Bear with me here folks, I'm cooking.