As we all know, wearing a helmet is mandatory in most countries, including India while driving a vehicle, not just because of ...

Hackaday’s Elliot Williams and Kristina Panos met up across the universe to bring you the latest news, mystery sound, and of course, a big bunch of hacks from the previous week.

A standard electret microphone can detect sub-audio "sounds" when some simple equalization circuitry is added.