instructables
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This DIY Bluetooth Boombox Is Made From An Old Ammo Container
Ammo containers aren’t super common, but you could probably find one at your local surplus store, or on eBay — and Instructables user r570sv turned this one into a massive Bluetooth speaker with a little DIY spirit and the right parts. Best of all, it’s an easy electronics project you can follow too.
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This DIY Sonic Tripwire Alarm Is A Loud, Perfect Early Warning System
Worried someone might intrude on your evil lair? This DIY sonic tripware alarm is easy to build, decently loud, and is perfect for simple hide-and-seek games or establishing a perimeter around whatever you’d like to keep safe.