yes its a cool trick! sadly those circuits work only with AC. if you put DC in you'd be disappointed with the output:)
there are DC 'switch cap' converters, they seem to show up in RS232 converters a lot
it is firmware controlled but its set once, its not like an interrupt has to go off at the exact right time. AVRs are pretty good about not freaking out as long as you have BOD set and a WDT (which it does).
also, to make the clock display brightness adjustable you cant just use an RC oscillator...how would you set the PWM duty cycle?
could it *possibly* screw up? sure. just like logic chips sometimes die or glitch. but its not medical equipment, theres no interlocks, its a DIY desk clock kit in a plastic enclosure.
Yup! If you look at the schematics or design document you will see how this works - its described in detail there but basically: If power is unplugged, the microcontroller kills the display and runs at 50uA off of a coin cell for a couple of weeks until power is restored. the low power RTC is used when theres a blackout or the clock is moved, etc.
Its a big pet peeve, all clocks should do this!
if you read the design document, schematic and source you'll see theres a lot more in there than just a counter. theres day calculator, date, alarm, low power mode, RTC, HV boost, menu system with configuration, etc etc. a $2.50 microprocessor isnt overkill when you consider its doing -everything- except drive the HV VFD.
Hi Anon. I designed the wave bubble project in mid 2004 as part of my research work. While the Bubl Space project is named somewhat similarly, the wave bubble is not based on it or stolen from it or derived from it. The BublSpace project is, in fact, conceptual and never functionally existed: http://www.textually.org/textually/archives/2004/08/005007.htm
Whereas the wave bubble is a fully functional design, completely documented, and open source.
from the two-is-one-more-than-one dept.
Klaus Schmidt writes "Virgin Galactic today unveiled their WhiteKnight Two mothership, called 'EVE.' It is designed to carry the smaller SpaceShip Two into space.
The rollout represents another major milestone in Virgin Galactic's quest to launch the world's first private, environmentally benign, space access system for people, payload and science.
Christened 'EVE' in honor of Richard Branson's mother — Sir Richard performed the official naming ceremony — WK2 is both visually remarkable and represents ground-breaking aerospace technology. It is the world's largest all carbon composite aircraft and many of its component parts have been built using composite materials for the very first time. At 140 ft, the wing span is the longest single carbon composite aviation component ever manufactured."