High voltage Thor’s Hammer: Mjolnir at 80,000 volts

[Thor's] hammer, Mjolnir, is pretty freaking awesome. It can only be picked up by [Thor], he can use it to fly, and probably the coolest part, it can summon lightning. After watching the first movie, and goofing around with the guys at ArcAttack, I had this idea that I could stuff a tiny tesla coil into a mjolnir and end up with a really cool prop.

At this point, I had to make a decision. I was either going to go portable and live with small arcs, or make this a stationary piece and hide a giant tesla coil in a base. It would have bigger arcs, but I couldn’t carry it around.  While I may re-visit the stationary version at some point, I ultimately decided I wanted to be able to wander around and play with this thing.

I had seen some videos of [Staci Elaan] showing off her battery-powered coils and I really liked her results. I figured, with her experience, she could probably do a better job than I could on getting the most bang out of a small package.  She was happy to be involved and delivered a small 12v powered coil for me to work with. I should also point out that the coils [Staci] makes are usually donated to educational groups. This woman is awesome.

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Hackaday Links: February 22, 2013

Playstation π


Yeah, it’s another home made Raspberry Pi case, but [Gabriel]‘s Mini Playstation 3.14 is the bee’s knees. The enclosure was once a metal gift box originally intended for gift cards. With a few whacks of a Dremel, the world finally has a new PS3 that runs Linux.

Up there with The Secret Life of Machines


[Mattias] sent in a tip about a really cool TV show airing in Sweden. It’s called Mekatronik, and it’s basically the interesting parts of Mythbusters where [Jamie] and [Adam] build random cool stuff. It’s a Swedish language program, so if anyone would like to make some subs for the episodes, we’ll be more than happy to link to it again.

Web-based software defined radio


The amateur radio club at University of Twente in the Netherlands came up with something really cool: a web-based software defined radio.  So what, you ask? It’s just streaming audio or something over the Internet? Nope. You can actually control this SDR over the web.

We’re deeply sorry for turning the hardware turn to slag. Really, we are.

Junk box Tesla coil


[JJ] whipped up a homemade Tesla coil out of junk he had lying around. Basically, it’s a piece of PVC pipe, a tennis ball, and aluminum foil. Even the transformer was pulled from a long-forgotten project. [JJ] is getting some really good arcs, so we’ll call this a win.

Time circuits active


[Danilo] was invited to a costume party with a movie theme. He wanted something Back to the Future-is, so he whipped up a flux capacitor (translation). It’s based on a PIC12F675, with the microcontroller running a bit of code that flashes the LEDs just like the movie. Now on to the hoverboard project…

X-Labs hackerspace completes a big 2-year Tesla coil build


It’s a bit difficult to estimate the size of the Tesla coil from this picture, but look closely at the hand rail on the red-orange wall to the left and that helps. The 10-foot tall musical Tesla Coil project has been on-going for about two years. But the team at X-Labs — a hackerspace affiliated with the University of South Florida — finished it just in time for the University’s engineering expo later in the month. There’s some information about it to be found in the recent student newspaper article on the project. A lot more build details are found on the groups website, although that post is quite old.

You can’t call it a musical coil unless there’s a demo video, and that can be seen after the jump. What better to test the thing than by playing the Super Mario Bros. theme? We’re actually more partial to the Imperial March (it’s also fun to hear played on stepper motors).

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Wireless light bulbs with a Slayer exciter

slayer rocksWhile playing chiptunes, creating lightning, and illuminating fluorescent tubes with a homebrew Tesla coil is awesome, they’re not exactly the safest electrical devices around, and certainly aren’t easy or cheap to build. There’s another option open if you’d like to play with strong electromagnetic fields; it’s called the Slayer exciter and is simple enough to light a few fluorescent bulbs wirelessly off a pair of 9 Volt batteries.

The circuit for the Slayer exciter is extremely simple – just a single power transistor, a few diodes, and a couple of resistors. The real power for this build comes from the custom-wound transformer made from more than 100 feet of magnet wire. After plugging the driver circuit into the transformer’s primary winding and connecting a metal ball (in this case a wooden ball covered in aluminum foil), it’s possible to light up a four Watt fluorescent tube with a pair of 9 Volts.

You can check out a video of the Slayer exciter after the break.

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Modulator box connects iPod to Tesla coil


This pass through audio modulator lets you playback stereo audio on two Tesla coils. But don’t fret, you can just use mono files if you only have one coil on hand. On one side there are inputs that connect to the audio source. The other side drives the Tesla coil, switching it on and off based on the relationship between a reference voltage and the audio signal. As you can hear in the video after the break this sounds great as long as you have the right kind of source audio.

The song played in that clip is the Duke Nukem 3D theme. [Daniel] started with a MIDI file and removed the chimes and drums to make the playback a little cleaner. The demo uses just one coil because the other was destroyed during testing when feedback between the two became a problem.

For some reason this reminds us of that singing Tesla coil hat. If you’re already on our mailing list (sign up in the sidebar) you know we’re getting pretty close to unveiling our own awesome Tesla coil project. It doesn’t sing… yet.

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Toorcamp: The Tesla Gun

We discussed [Rob]‘s Tesla Gun in the past. At that time, the build looked very impressive, but had not been fired yet. Fortunately, [Rob] got the device working and brought it to Toorcamp. He took the gun out every night and demoed the handheld Tesla Coil by having volunteers catch the streamers with a knife.

The gun uses a cordless drill battery for power, and a flyback transformer to generate the ~20,000 volts needed to drive the coil. The power electronics module was designed to be easy to replace, and [Rob] had extras at Toorcamp in case he burnt one up. [Rob]‘s build log is very detailed, and definitely worth reading through. It explains how he cast the enclosure out of aluminium, built a custom porcelain high voltage switch, and designed the power electronics.

While this build should probably get a “do not try this at home” label, he definitely created something unique. We’re looking forward to when [Rob] shows the gun off next.

MakerFaire K.C. sneak peak at ArcAttack’s new toy

I’ve been seeing videos of ArcAttack all over the web for several years now and hoped one day I’d be able to cross paths with them. When I heard they were going to be at MakerFaire K. C., I was determined to grab them and ask a few questions. As it turns out, they’re fans of Hackaday and were happy to talk. Not only that, but when I was asking what fun things they were building, their eyes lit up. “You’re going to love this” one of them said as he ran off behind the stage.  He returned with a device which was strapped to his body and spitting 5 foot long lightning bolts. He was right, I did love it!  They demonstrated this proton pack looking portable tesla coil for a while, shocking each other and random bits of metal, all the wile grinning like the fools we all are.

I know we’ve covered a portable tesla coil or two before, but seeing this thing in person,heading right for you,strapped to someone who might actually even be able to run faster than you, is pretty cool.

There is video (sorry, shaky) and a ton of pictures after the break. Enjoy.

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