Much Faster Cold Brew Through Cavitation

Some coffee snobs might call this sacrilege. Cold brew is supposed to take a long time — that’s part of how it gets its characteristic smoothness. But a group of engineers from the Univ…

Skip The Radio With This Software-Defined Ultrasound Data Link

We know what you’re thinking: with so many wireless modules available for just pennies, trying to create a physical data link using ultrasonic transducers like [Damian Bonicatto] did for a sh…

Converting A Sink To An Ultrasonic Cleaner

While ultrasonic cleaning might sound a bit like the “sonic shower” from Star Trek, this is actually one case where the futuristic-sounding technology predates its use in Sci-Fi. Ultras…

DIY Hydrophone Listens In On The Deep For Cheap

The microphone is a pretty ubiquitous piece of technology that we’re all familiar with, but what if you’re not looking to record audio in the air, and instead want to listen in on what&…

VCF East 2021: The Early Evolution Of Personal Computer Graphics

The evolution of computer graphics is something that has been well documented over the years, and it’s a topic that we always enjoy revisiting with our retrocomputing readers. To wit, [Stephe…

Surf Sensor Adds Depth To Finding The Ultimate Wave

To say that the ocean is a dynamic environment would be a gross understatement, especially when coastlines are involved. Waves crash, tides go in and out, and countless variables make even the usua…

The Humble NE-2 Neon Lamp Has A New Trick

Ah, the humble neon lamp. The familiar warm orange glow has graced the decks of many a DIY timepiece, sometimes in a purely indicating duty, and sometimes forming a memory element in place of a mor…

Ultrasonic Array Powers This Halloween Spirit Writer

The spooky season is upon us, and with it the race to come up with the geekiest way to scare the kids. Motion-activated jump-scare setups are always a crowd-pleaser, but kind of a cheap thrill in o…