March 31, 2007

Ball Bearing Clock
Complex Hacks

23

I could think of about a hundred ways to make a simpler clock, but this Ball Bearing Clock looks fantastic. Video after the jump.   "I though about building a clock with a pendulum activated by the fall of bearing balls. The first thing to design was the engine which was to sustain the pendulum’s oscillation: how to get enough energy from a ball to make this possible? The balls

DIY BFO Metal Detector
Cool Gadgets

14

Here is a simple design for a DIY metal detector that uses a beat frequency oscillator. “BFO ( beat frequency oscillator ) metal detectors use two oscillators, each of which produces a radio frequency. One of these oscillators uses a coil of wire that we call the search loop. The second oscillator uses a much smaller coil of wire, and is usually inside the control box and is called the