High voltage rig wipes CDs clean


Here at Hackaday, we’re not against showing videos of gratuitous destruction just for the sake of it, though we try not to make it a habit. In this case we just couldn’t help ourselves. However, this video technically constitutes a security hack, as it does involve erasing sensitive information from CDs…

…with awesome!

This may be the coolest CD eraser we’ve seen yet. Positioned between two high-voltage transformers, the spinning CD has its data violently stripped off in just a matter of seconds. To be fair, the data isn’t erased per se, but the metallic substrate on which the data is recorded is flaked off by the aggressive application of electricity.

Having destroyed our fair share of AOL CDs in the microwave over the years, we are now a bit sad over the fact that they were disposed of in such a lackluster fashion – if only we had one of these around!

Since we’re on the topic of mindless destruction, you might as well take a few minutes and check out this thermite-roasted Thanksgiving turkey, this self-destructing hard drive, or perhaps this thermic lance built from spaghetti.

You know, for science.

Continue reading “High voltage rig wipes CDs clean”

Musical Tesla concert is electrifying


Hackaday reader [Tyler Laseter] wrote in to tell us about an event that he and his fellow Tesla Orchestra team members are hosting next month.

The “Open Spark Project” is a concert event taking place on May 14th, which melds together electricity and music in spectacular fashion. The event features two large Tesla coils which are tuned to play musical notes while shooting bolts of electricity through the air.

Musical Tesla coils are nothing new around here, but we have yet to see someone allow the general public to play music on their coils. That’s what makes this event unique – anyone is encouraged to submit their to the Tesla Orchestra team, which will then be played back via a live video stream next month. Their web site offers up all of the technical details as well as the file format requirements for submitting music for the event, so get started on your entry today!

If a passive approach is more your style, stick around for a quick video demonstrating their coils’ abilities. Sure it’s Lady Gaga, but we won’t tell anyone you watched it. Plus, it’s totally legit when the song is being played using 20,000 volts.

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Dead motor? Think again

While hobby brush motors are pretty cheap now adays, there’s always that feeling of why replace when you can rebuild and reuse. As such [John Carr] presents how to change the brush position in motors to revive a dead motor. So long as the motor dies from natural causes commutator wear, the idea is the brushes can be moved along the axes and fixed to a new portion of commutator that’s not worn at all. [John] also goes through the details of some tricky reassembly, but we think to make this complete a guide on brush replacement and commutator replacement might be in order hint hint.

Making liquid nitrogen at home

If you’ve got some time to scour eBay and $500 sitting around you can build your own liquid nitrogen plant. [Ben Krasnow] figured it all out for you and estimates he can produce a liter of the stuff for around $1.15. The process depends on a membrane to separate nitrogen from the other materials in the air around us and a cryocooler to get the gas cold enough to condense into a liquid. Other than atmospheric air, you need to pump in electricity. About 9.6 kWh per liter… yikes! Is your human hair solar panel up to that?

Anyway, once you’re up and running you can make yourself some ice cream or possibly save the world from oily destruction.

[Thanks Chris]

Google unveils API to PowerMeter

Google’s tentacles continue to wrap around every portion of our lives with the addition of an API for their PowerMeter software. The PowerMeter tool works with smart electricity meters to monitor and display power usage in the home. This will allow manufacturers (and hackers alike) to design new devices with the Google interface in mind.

We’ve got an old-fashioned power meter with a spinning dial and no blinking LED. This means we can’t monitor that blink to add our own PowerMeter interface. But if you do have an easy way to grab data from your meter you can design a home system that takes full advantage of Google’s tools.

Ok, who’s going to be the first to have their Google PowerMeter-compatible hack featured on Hackaday?

[Thanks Juan]

Wireless electricity

[Eric Giler] has a talk available over at TED that discusses and demos delivering electricity without wires. Called WiTricity, these methods were developed by a team at MIT a few years ago who were working off of the concepts of Nicolai Tesla. The facts shared about our current energy delivery system are a bit shocking; we’ve spent over $1 trillion in infrastructure and produce more than 40 billion disposable batteries each year.

The demonstration in the video starts about 6:30 into it. At first we see a flat panel television powered wirelessly from about 6 feet away, then the T-Mobile G1 powered from the same distance. The thought of new TVs coming with WiFi and WiTricity standard would mean just hanging it on the wall with no cords to run. We can also image cellphones that have a battery only for backup purposes when you were not near a transmitter.

The power transfer occurs between two coils that resonate at the same frequency and only that frequency. This remind us a bit of Orson Scott Card’s fantasy communications device from the Ender’s Saga.

High voltage cable inspection


Have you ever wondered how they inspect high voltage cables without taking them out of service? Check out this video which offers a glimpse into the life of a professional high voltage cable inspector. There are parts of the job you’d expect—namely perching on the cable like a bird, trying to not fall off—but the part of the job you wouldn’t expect is the suit. This suit is made of 75% Nomex, to prevent it from catching fire, and 25% stainless steel thread, turning the suit into a wearable Faraday cage. Of course, because he’s got a Faraday cage mere millimeters from his skin, the cable inspector spends his workday surrounded by half a million volts.  To avoid electric shock, he equalizes the voltage potential between himself and the line before touching the cable.

Depending on your specific phobias, this video might make your job seem really dull… or really really safe.

[via Gizmodo]