[Yannick], aka [Gigawipf] brings us this (mostly) musical delicacy: a 3D-printed siren that’s driven by a brushless quadcopter motor, and capable of playing (mostly) any music that you’…

We’re all used to the changes in the properties of radio frequency systems as the frequency increases and the wavelength becomes shorter. The difference between the way an FM radio and a WiFi…

There's a new challenger on the block for the title of the "Worlds Smallest 4x4x4 RGB LED Cube". At 13x13x36 mm, [nqtronix]'s Cube Pendant is significantly smaller than [HariFun's] version, which me...

The demoscene is a hotbed of masterful assembly programming, particularly when it comes to platforms long forgotten by the passage of technology and time. There’s a certain thrill to be had i…

For the longest time now, I’ve wanted to build a real, proper radio telescope. To me, this means a large parabolic reflector, a feed horn made of brass sheet, coat hanger wire, and at least f…

Would you believe a pendulum clock that can keep time accurately to within one second per year? If you answered “yes”, you’ve either never tried to regulate a pendulum clock yours…

If you know me at all, you know I'm a car guy. I'm pretty green as far as hardcore wrenching skills go, but I like to tackle problems with my vehicles myself - I like to learn by doing. What follows i...

Like a lot of mass-produced consumer goods, it turns out that the internal workings of Bluetooth headphones are the same across a lot of different brands. One common Bluetooth module is the CSR8645…

Most old-school remote controlled cars broadcast their controls on 27 MHz. Some software-defined radio (SDR) units will go that low. The rest, as we hardware folks like to say, is a simple matter of c...

When [Zeke Gabrielse] needed to book a flight, the Internet hive-mind recommended that he look into traveling with Southwest airlines due to a drop in fares late Thursday nights. Not one to stay up al...

A serial backpack is really nothing more than a screen and some microcontroller glue to drive it. And a hammer is nothing more than a hardened weight on the end of a stick. But when you’re pr…

If you want to eavesdrop on GSM phone conversations or data, it pays to have deep pockets, because you’re going to need to listen to a wide frequency range. Or, you can just use two cheap RTL…

If you’ve ever tried to bend a metal pipe or bar over your knee, you’ll know that even lightweight stock requires quite a bit of force. And the force needs to be properly directed, lest…

With interest and accessibility to both wearable tech and virtual reality approaching an all-time high, three students from Cornell University — [Daryl Sew, Emma Wang, and Zachary Zimmerman] …

Riffling through my box of old projects, I came upon a project that I had built in the 80’s — an Automotive Multimeter which was published in the Dutch/British Elektor magazine. It coul…

Flying is an energy-intensive activity. The birds and the bees don't hover around incessantly like your little sister's quadcopter. They flit to and fro, perching on branches and leaves while they pla...

When I first got interested in computers, it was all but impossible for an individual to own a computer outright. Even a “small” machine cost a fortune not to mention requiring specialized power, c…

FPV drones are a fun but often costly hobby for beginners. Opting for a smaller drone will reduce the chance of damaging the drone when one invariably crashes and the smaller props are also a lot s…

If you want to create a large display with a matrix of LEDs, it’s a relatively straightforward process. Thanks to addressable LED tape and microcontrollers it becomes more of a software issue…

The eternal enemy of [James Puderer]'s pockets is anything that isn't his smartphone. When the apartment building he resides in added a garage door, the forces of evil gained another ally in the form ...