Collaborate Disseminate
For certain high-security devices, such as card readers, ATMs, and hardware security modules, normal physical security isn’t enough – they need to wipe out their sensitive data if someone starts …read more Continue reading Tamper Detection with Time-Domain Reflectometry
The meaning of Inception’s ending famously revolves around a top which spins forever in dreams, but in real life comes to a stop like any other top. Any other top, …read more Continue reading Self-Powered Top Spins for Hours
When [Electron Impressions] used a powerful ultrasonic array to project a narrow beam of sound toward a target, he described it as potentially useful in getting someone’s attention from across …read more Continue reading Accurately Aiming Audio with an Ultrasonic Array
There’s an adage coined by [Ian Betteridge] that any headline ending in a question mark can be answered by the word “No”. However, Lorentz invariance – the theory that the …read more Continue reading Is the Theory of Special Relativity Wrong?
Variable capacitors may be useful, but the air gap that provides their capacitance is their greatest weakness. Rather than deal with the poor dielectric properties of air, some high-end variable …read more Continue reading Taking a Look at Variable Vacuum Capacitors
At some point during our primary school careers, most of us probably constructed a simple compass, often by floating a magnetized needle on a cork in a cup of water. …read more Continue reading A New Kind of Inductively-damped Compass
A knob can make a surprisingly versatile interface, particularly if it’s the SmartKnob, which builds a knob around a BLDC motor for programmable haptic response. It can rotate freely or …read more Continue reading Simplifying the SmartKnob
Nitrous oxide’s high-speed abilities don’t end with racing cars, as it’s a powerful enough oxidizer to be a practical component of rocket propellant. Since [Markus Bindhammer] is building a hybrid …read more Continue reading Testing Laughing Gas for Rocket Propellant
One of the perennial challenges of building robots is minimizing the size and weight of drive systems while preserving power. One established way to do this, at least on robots …read more Continue reading Tying up Loose Ends on a Rope-based Robot Actuator
An accessible 3D printer for metals has been the holy grail of amateur printer builders since at least the beginning of the RepRap project, but as tends to be the …read more Continue reading Printing in Metal with DIY SLM