Collaborate Disseminate
CDMA2000 was one of the protocols defined for 3G networks and is now years out of date and being phased out worldwide. Nevertheless, there are still vast numbers of phones …read more Continue reading Running Your Own 3G Network
[Aaed Musa] has been building robot dogs for a long time now, so it was only natural that he would make one for the senior design project of his mechanical …read more Continue reading An Improved Robot Dog for Senior Design
Electrostatic discharge machining (EDM) may be slower than alternatives like laser cutting, water jets, or a milling machine, but for some applications there’s no alternative: it can cut through any …read more Continue reading Cutting Steel Gears with Homemade EDM
The ionosphere is of great importance to shortwave radio transmissions, since it allows radio waves to be refracted and reflected over the horizon, and it’s therefore unfortunate that the height …read more Continue reading A Shortwave Sensor to Monitor the Ionosphere
Although modern cameras can, with skill and good conditions, produce photographs nearly indistinguishable from the original scene, this fidelity relies on the limitations of human vision. According to the trichromatic …read more Continue reading True-Spectrum Photography with Structural Color
Ultrasonic levitation is by now a familiar trick: one or more ultrasonic transducers create a standing wave, and small objects can be held in the nodes of this standing wave. …read more Continue reading A Different Kind of Ultrasonic Levitation
If you take a video of a spinning wheel, you’ll probably notice that the spokes appear to turn more slowly than the wheel is actually rotating, and sometimes in the …read more Continue reading Freeze Moving Tools with a Stroboscopic Camera
Rim-driven thrusters turn the normal propeller-motor arrangement inside out; rather than mounting the motor at the center of the propeller, they use a large hollow motor, with the blades attached …read more Continue reading Building a Rim-Driven Jet Engine
Capacitive displacement sensors span a wide range of resolution, from the touchscreen sensors which can only detect displacement as a binary state, all the way to the sensors in semiconductor …read more Continue reading Using Capacitance for Extremely Sensitive Proximity Sensing
Of all the remote-control vehicles one can build, a submarine is possibly the hardest: if something goes wrong with almost any other vehicle, it’s easy to recover and repair, but …read more Continue reading 3D-Printed Parts Nearly Sink RC Submarine