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22:00
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Hack a Day
You’d think that something made out of glass and epoxy would transmit a decent amount of light. Unfortunately for [Jeremy Ruhland], it turns out that FR4 is not great light pipe material, at least in one dimension.
The backstory on this has to do with #badgelife, where it has become popular to reverse mount SMD LEDs on areas of PCBs that are devoid of masking, allowing the light to shine through with a warm, diffuse glow – we’ve even featured a through-PCB word clock that uses a similar technique to wonderful effect. [Jeremy]’s idea was to use 0603 SMD LEDs mounted inside non-plated through-holes to illuminate the interior of the board edgewise. It seems like a great idea, almost like the diffusers used to illuminate flat displays from the edge.
Sadly, the light from [Jeremy]’s LEDs just didn’t make it very far into the FR4 before being absorbed – about 15 mm max. That makes for an underwhelming appearance, but all is certainly not lost. Valuable lessons about PCB design were had, like exactly how to get a fab to understand what you’re trying to do with non-plated holes and why you want to fence the entire edge of the board in vias. But best of all, [Jeremy] explored what’s possible with Oreo construction, and came away with ideas for other uses of the method. That counts as a win in our book.
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10:01
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Hack a Day
[Julian] needed to weld a bit of nickel to some steel and decided to use a spot welding technique. Of course he didn’t have a spot welder sitting around. Since these are fairly simple machines so [Julian] set out to build a spot welder using a charged supercapacitor. The fundamentals all seem to be there — the supercap is a 100 Farad unit and with a charge of 2.6V, that works out to over 300 joules — yet it simply doesn’t work.
The problem is in how the discharge energy is being directed. Just using the capacitor would cause the charge to flow out as a spark when you got near the point to discharge. To combat this, [Julian] put a microswitch between the capacitor and the copper point he expected to use as the welding tip. The microswitch, of course, is probably not the best for carrying a large surge of current, so we suspect that may be part of why he didn’t get great results.
The other thing we noticed is that he used a single point and used the workpiece as a ground return. Most spot welders use two points near each other or on each side of the workpiece. The current from the capacitor is probably just absorbed by the relatively large piece of metal.
The second video below from [American Tech] shows a 500F capacitor doing spot welding with little more than two wires and it seems to work. Hackaday’s own [Sean Boyce] even made one out of some whopping 3000F caps. It did work, although he’s been pursuing improvements.
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13:00
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Hack a Day
Imagine if you will that you are enthroned upon the porcelain, minding your own business while doing your business. You’re catching up on Hackaday on your phone – c’mon, admit it – when a whir and a buzz comes from behind you. You sit up in alarm, whereupon your lower back suddenly feels as if someone is scrubbing it with a steel wool pad. Then the real pain sets in as super-hot plasma lances into your skin, the smell of burning flesh fills the bathroom, and you crack your head on the towel bar trying to escape this torture chamber in a panic.
Sound good? Then [Vije Miller]’s plasma-powered toilet air freshener is a must-build for you. We’re not entirely sure where this was going, but the name of the project seems to indicate a desire to, ahem, clear the air near your derrière with the power of ions. While that might work – we’ve recently seen an electrostatic precipitator for 3D-printer fumes – the implementation here is a bit sketchy. The ball of steel wool? It was possibly intended as a way to disperse the ions, but it served as nothing more than fuel when touched by the plasma. The Contact-esque gimballed rings? Not a clue what they’re for, but they look cool. And hats off to [Vije] for the intricate 3D-printed parts, the geartrain and linkages, and the DIY slip rings.
It may be a head-scratcher of a build, but the video below is entertaining. Check out some of [Vije]’s other projects of dubious value, like his licorice launcher or the smartphone back scratcher.
Thanks to [Vije]’s friend [Amanda] for the tip.
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22:00
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Hack a Day
There’s something seriously wrong with the Arduino walkie-talkie that [GreatScott!] built.
The idea is simple: build a wireless intercom so a group of motor scooter riders can talk in real-time. Yes, such products exist commercially, but that’s no fun at all. With a little ingenuity and a well-stocked parts bin, such a device should be easy to build on the cheap, right?
Apparently not. [GreatScott!] went with an Arduino-based design, partly due to familiarity with the microcontroller but also because it made the RF part of the project seemingly easier due to cheap and easily available nRF24 2.4 GHz audio streaming modules. Everything seems straightforward enough on the breadboard – an op-amp to boost the signal from the condenser mic, a somewhat low but presumably usable 16 kHz sampling rate for the ADC. The radio modules linked up, but the audio quality was heavily distorted.
[GreatScott!] assumed that the rat’s nest of jumpers on the breadboard was to blame, so he jumped right to a PCB build. It’s a logical step, but it seems like it might be where he went wrong, because the PCB version was even worse. We’d perhaps have isolated the issue with the breadboard circuit first; did the distortion come from the audio stage? Or perhaps did the digitization inject some distortion? Or could the distortion be coming from the RF stage? We’d want to answer a few questions like that before jumping to a final design.
We love that [GreatScott!] has no issue with posting his failures – we’ve covered his suboptimal CPU handwarmer, and his 3D-printed BLDC motor stator was a flop too. It’s always nice to post mortem these things to avoid a similar fate.
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10:01
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Hack a Day
It all started when I bought a late-1990s synthesizer that needed a firmware upgrade. One could simply pull the ROM chip, ship it off to Yamaha for a free replacement, and swap in the new one — in 2003. Lacking a time machine, a sensible option is to buy a pre-programmed aftermarket EPROM on eBay for $10, and if you just want a single pre-flashed EPROM that’s probably the right way to go. But I wanted an adventure.
Spoiler alert: I did manage to flash a few EPROMs and the RM1X is happily running OS 1.13 and pumping out the …read more
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10:01
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Hack a Day
A colleague of mine used to say he juggled a lot of balls; steel balls, plastic balls, glass balls, and paper balls. The trick was not to drop the glass balls. How do you know which is which? For example, suppose you were tasked with making sure a nuclear power plant was safe. What would be important? A fail-safe way to drop the control rods into the pile, maybe? A thick containment wall? Two loops of cooling so that only the inner loop gets radioactive? I’m not a nuclear engineer, so I don’t know, but ensuring electricians at a nuclear …read more
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8:00
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Hack a Day
We usually reserve the honor of Fail of the Week for one of us – someone laboring at the bench who just couldn’t get it together, or perhaps someone who came perilously close to winning a Darwin Award. We generally don’t highlight commercial products in FotW, but in the case of this substandard RF signal generator, we’ll make an exception.
We suppose the fail-badge could be pinned on [electronupdate] for this one in a way; after all, he did shell out $200 for the RF Explorer signal generator, which touts coverage from 24 MHz to 6 GHz. But in true …read more
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4:01
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Hack a Day
A lot of times these days, it seems like we hackers are a little like kids in a candy store. With so many cool devices available for pennies at the click of a mouse, it’s temptingly easy to order first and ask questions about quality later. Most of the time that works out just fine, with the main risk of sourcing a dodgy component being a ruined afternoon of hacking when a part fails.
The stakes are much higher when you’re connecting your project to the house mains, though, as [Mattias Wandel] recently learned when the solid-state relay controlling his …read more
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16:00
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Hack a Day
Sometimes the best you can say about a project is, “Nice start.” That’s the case for this as-yet awful DIY 3D scanner, which can serve both as a launching point for further development and a lesson in what not to do.
Don’t get us wrong, we have plenty of respect for [bitluni] and for the fact that he posts his failures as well as his successes, like composite video and AM radio signals from an ESP32. He used an ESP8266 in this project, which actually uses two different sensors: an ultrasonic transducer, and a small time-of-flight laser chip. Each was …read more
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4:00
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Hack a Day
The ESP8266 has become such a staple of projects in our community since it burst onto the scene a few years ago. The combination of a super-fast processor and wireless networking all on the same chip and sold in retail quantities for relative pennies has been irresistible. So when [Petteri Aimonen] needed to make a wireless intercom system for cycling trips it seemed an obvious choice. Push its internal ADC to sample at a high enogh rate for audio, and stream the result over an ad-hoc wi-fi network.
The result was far from satisfactory, as while early results with a …read more
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19:00
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Hack a Day
Like many of us, [Tony] was entranced by the idea of casting metal, and set about building the tools he’d need to melt aluminum for lost-PLA casting. Little did he know that he was about to exceed the limits of his system and melt a hole in his patio.
[Tony]’s tale of woe begins innocently enough, and where it usually begins for wannabe metal casters: with [The King of Random]’s homemade foundry-in-a-bucket. It’s just a steel pail with a homebrew refractory lining poured in place, with a hole near the bottom to act as a nozzle for forced air, or …read more
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4:00
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Hack a Day
[Ryan Wamsley] has spent a lot of time over the past few months working on a new project, the Ultimate LoRa backplane. This is as its name suggests designed for LoRa wireless gateways, and packs in all the features he’d like to see in a LoRa expansion for the Nano Pi Duo.
His design features a three-terminal regulator, and in the quest for a bit more power efficiency he did what no doubt many of you will have done, and gave one of those little switching regulator modules in a three-terminal footprint a go. As part of his testing he …read more
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16:01
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Hack a Day
It seemed like a good idea to build a semiconductor lapping machine from an old hard drive. But there’s just something a little off about [electronupdate]’s build, and we think the Hackaday community might be able to pitch in to help.
For those not into the anatomy and physiology of semiconductors, getting a look at the inside of the chip can reveal valuable information needed to reverse engineer a device, or it can just scratch the itch of curiosity. Lapping (the gentle grinding away of material) is one way to see the layers that make up the silicon die that …read more
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10:00
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Hack a Day
You should be used to our posting the hacks that didn’t quite go according to plan under our Fail Of The Week heading, things that should have worked, but due to unexpected factors, didn’t. They are the fault, if that’s not too strong a term, of the person making whatever the project is, and we feature them not in a spirit of mockery but one of commiseration and enlightenment.
This FOTW is a little different, because it reveals itself to have nothing to do with its originator. [Grogster] was using the widely-available HC-12 serial wireless modules, or clones or even …read more
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10:00
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Hack a Day
Even when you build something really, really nice, there’s always room for improvement, right? As it turns out for this attempted upgrade to a DIY spot welder, not so much.
You’ll no doubt recall [Mark Presling]’s remarkably polished and professional spot welder build that we featured some time ago. It’s a beauty, with a lot of thought and effort put into not only the fit and finish but the function as well. Still, [Mark] was not satisfied; he felt that the welder was a little underpowered, and the rewound microwave oven transformer was too noisy. Taking inspiration from an old …read more
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4:00
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Hack a Day
Very slowly, some very cool parts are coming out on the market that will make for some awesome builds. Supercapacitors are becoming a thing, and every year, the price of these high power supercaps go a little lower, and the capacity gets a little higher. It’s really only a matter of time before someone hacks some supercaps into an application that’s never been seen before. The Navy is doing it with railguns, and [David] is building an electric bike, powered by AA batteries. While [David]’s bike technically works with the most liberal interpretation of ‘technically’, it’s the journey that counts …read more
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10:01
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Hack a Day
GPS is the modern answer to the ancient question about one’s place in the world yet it has its limitations. It depends on the time of flight of radio signals emitted by satellites twenty thousand kilometers above you. Like any system involving large distances and high velocities, this is bound to offer some challenges to precise measurements which result in a limit to achievable accuracy. In other words: The fact that GPS locations tend to be off by a few meters is rooted in the underlying principle of operation.
Today’s level of precision was virtually unattainable just decades ago, and …read more
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14:13
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Hack a Day
[Dino's] hack this week seeks to create sunglasses that dim based on the intensity of ambient light. The thought is that this should give you the best light level even with changing brightness like when the sun goes behind a cloud or walking from inside to outside. He started with a pair of 3D shutter [...]
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6:01
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Hack a Day
If one hack that controls amputated cockroach legs this week wasn’t enough for you, we’ve got another. Earlier this week we saw two neuroscientists at Backyard Brains put on a show at a TED talk by connecting an amputated cockroach leg (don’t worry, they grow back) to a $100 electronic device called the SpikerBox. The SpikerBox allows [...]
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12:01
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Hack a Day
Last week we posted a link to Project Kiwi, a homebrew Motorola 68008-based microcomputer built by [Simon] that includes Ethernet, a very good display adapter, an interface for IDE hard disks, two Commodore SID chips (for stereo chiptunes), a floppy disk controller, and an already existent software library that will make it very easy to develop your [...]
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4:01
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Hack a Day
So last week [Caleb] posted an article about hacking a floating LED ball. In response, here’s a couple simple LED hacks or repurposings that I’ve come up with recently. LED Solar Glow Cube: If you’ve ever seen path lights lighting up people’s gardens or walkways you may have wondered what components they had in them [...]
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5:00
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Hack a Day
It may be a week after the fact, but former Hackaday alum and inventor of the Bus Pirate [Ian Lesnet] made a great guide to the Bay Area Maker Faire. The San Francisco-area Maker Faire attracts 100,000 makers, tinkerers, hackers, and general geeks to a bazaar of DIY and generally cool stuff. All the regulars were [...]
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22:38
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SecDocs
Tags:
social Event:
Chaos Communication Congress 28th (28C3) 2011 Abstract: In 2004 I started a weekly podcast on international under-reported news based on a feeling that this was something I enjoy doing and I could be good at. More than 7 years and 400 episodes later, with the help of listeners and friends, I have travelled almost nonstop to some of the most interesting and unexpected corners of the world. These travels have led me to some unconventional guests, topics, and life choices. Through it all, week after week, I have kept the program going. The lessons I've learned and continue to learn going forward, tell a story that answers alot of today's most popular questions about the future of the internet and independent journalism. From crowd source funding to the streets of New Orleans, from itunes politics to the mountains of Afghanistan, I will share these stories and whatever wisdom they have brought me.
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22:38
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SecDocs
Tags:
social Event:
Chaos Communication Congress 28th (28C3) 2011 Abstract: In 2004 I started a weekly podcast on international under-reported news based on a feeling that this was something I enjoy doing and I could be good at. More than 7 years and 400 episodes later, with the help of listeners and friends, I have travelled almost nonstop to some of the most interesting and unexpected corners of the world. These travels have led me to some unconventional guests, topics, and life choices. Through it all, week after week, I have kept the program going. The lessons I've learned and continue to learn going forward, tell a story that answers alot of today's most popular questions about the future of the internet and independent journalism. From crowd source funding to the streets of New Orleans, from itunes politics to the mountains of Afghanistan, I will share these stories and whatever wisdom they have brought me.
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6:00
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Hack a Day
Another week has come and gone and that means that it is time for our week in review. These are the top posts that have been viewed at Hackaday in the past week. Coming in at first place is a post about a project by [Red Jones] and [Brian Kast] of Sandia labs. Ethical issues [...]
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6:00
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Hack a Day
Another week has passed and it is time to review the best of what hit our blog in the past week. In first place is a repeat from last week showing how you can turn an Android device with a CMOS camera into a radiation detector. In first place if we ignore repeats is a [...]
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6:00
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Hack a Day
In case you missed them the first time around, here are our most popular posts from the past week. In first place was a repeat from last week of how you can make a privacy screen from an old LCD display. We want to serve up fresh stuff in this post though so we’ll add [...]
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11:01
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Hack a Day
This week, we are serving up part five in our series where we are using the Pololu 3pi robot as a fancy development board for the ATmega328p processor. This week we are taking a quick break from working with the perpherals specific to the processor and will show how to work with the 3pi’s line [...]
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9:01
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Hack a Day
In this week’s video, we continue on where we left off last week with another in our series of videos where we discuss how to program for the ATmega328p processor. This week, [Jack] takes a look at the analog to digital converter and takes us through how to set things up and then how to [...]
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11:01
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Hack a Day
Typically, when people hear that you’ve made a Halloween costume for your dog, the statement is met with the eye rolling and polite lies about how cute the outfit is. There are few exceptions to this rule, and [Dino’s] latest creation is one of them. For this week’s entry in his Hack a Week series, [...]
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7:00
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Hack a Day
In case you missed them the first time, here are the most popular posts from this week: Our most popular post this week was about how to use HTML5 to display sensor data. This is a pretty interesting demo of the new web technology. Next up is a post about an animatronic zombie that can [...]
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7:00
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Hack a Day
In case you missed them the first time, here are our most popular posts from the past week. Our most popular post of the week was about a ball that has a matrix of 256 LEDs encrusted onto its surface, allowing all sorts of patterns to be displayed. Next up is a post about the [...]
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7:00
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Hack a Day
In case you missed them the first time around, here are our most popular posts from the past week. Our most popular post of the week was one about a rocket that was built by the [Qu8k team] that was their entry for the Carmack Prize, which put up a purse of $10,000 for proof [...]
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7:00
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Hack a Day
In case you missed them the first time, here are our most popular posts from the past week. Our most popular post this week is about a clock modeled after Lord Vetinari’s clock in Discworld that ticks at random intervals but keeps accurate time. Our next most popular post is of a project that takes [...]
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15:01
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Hack a Day
Reading this week’s ATtiny-themed builds, [Thomas] was reminded one of his coolest builds. His midi808 project used an ATtiny2313 to sync a vintage Roland 808 drum machine to his Logic workstation. Even though MIDI had been around for a few years when 808s were being made, the CPU in the 808 isn’t exactly up to [...]
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10:01
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Hack a Day
This week we are continuing on with our multi-part series where [Jack] shows you how to use Eagle CAD. This video continues where last week’s video left off by showing how to create a custom part and how to use the schematic editor. If you haven’t seen last week’s video, you can find it here. [...]
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10:01
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Hack a Day
Hacker [Dino Segovis] is back with yet another installment of his Hack a Week series, and it’s looking like he isn’t too worse for wear after hunkering down to face hurricane Irene. This week, it seems that [Dino] is having some problems separating his PNP transistors from his NPNs. After Albert Einstein proves to be [...]
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8:01
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Hack a Day
In case you missed them, here are our biggest posts from the past week. For the weapons enthusiasts in our audience, make sure to check out our most popular post this week where [Liquider] shows a project in which an airsoft pistol was converted into a coil gun. Our next most popular post was based [...]
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7:00
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Hack a Day
In case you missed them, here are our biggest posts from the past week. The post that drew the most attention this week was our own [Kevin Dady]‘s post about how to install Linux on a 386. In this post, he talks about the process that he used to put a functional copy of Linux [...]
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13:01
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Hack a Day
For this week’s hack, [Dino] was working on a mechanical cat toy, but the project fell apart towards the end for some reason or another. With time running out, he had to come up with something on pretty short notice, using whatever he happened to have on hand. Luckily he picks up some seriously weird [...]
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14:41
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Carnal0wnage
Joe McCray with Strategic Security is running a two week exploit dev course.
Course Description & Instructor Information:
http://strategicsec.com/Exploit-Dev-Courses-Oct-2011.pdfStrategic Security has teamed up with Net-Square to provide the most comprehensive exploit development course package available to the public. Occasionally similar courses are offered privately to various three letter agencies and large financial institutions.
Exploit development is often considered the most difficult area of focus in the entire field of IT security. It requires both a broad range of skills and deep level of knowledge in Networking, Operating Systems, and Programming. Now you too can learn what has long been thought to be "Black Magic" by many from one of the top practitioners and trainers in the world.
How is this course put together?
The course is actually a 2 week package deal designed to both teach the fundamentals of modern exploit development and give the student ample guided practice time with the instructor to actually get proficient.
Dates:
Exploit Dev: No Assembly Required Oct 31 - 4 Nov 2011 (5 Days)
Exploit Dev: Target Practice Nov 7 - 11 2011 (5 Days)
Training Location
The workshops will be held at "The Academy of Computer Education" in Greenbelt, MD.
The address is:
7833 Walker Drive, Suite 520C Greenbelt, Maryland 20770
$1000 Discount by using these links
Exploit Dev 1 Week @ $5,000
http://tinyurl.com/SS-EDNAR-D-CGExploit Dev 1 Week @ $6,000
http://tinyurl.com/SS-D-EDTP-CGExploit Dev 2 Week Package Deal @ 8,500
http://tinyurl.com/SS-EDNAR-TP-D-CG
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10:01
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Hack a Day
[Dino Segovis] is at it again! For this week’s installment of his “Hack A Week” series [Dino] is holding a guitar pickup winding 101. Professional guitar pickups can cost hundreds of dollars, but are all essentially a permanent magnet wrapped in a bunch of wire. Using some cheap headphones, magnet wire, and a spare bolt [...]
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8:13
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Hack a Day
If you don’t have a 9-to-5 type of job you might find yourself constantly resetting your alarm clock as your calendar commitments change. [Lucas] finally got fed up with the nightly ritual and decided to build his own alarm clock which has unique settings for each day of the week (translated). The display itself is an [...]
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12:39
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Hack a Day
Maker [Dino Segovis] has started on a project he calls “Hack a week” where he will be putting together one hack or project per week, for a full year. The first installment of his video series was finished just two days before April Fool’s, and appropriately enough covers the construction of a circuit you can [...]
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10:52
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Hack a Day
The Copenhagen Suborbitals are now within one week of their first launch. We looked in on the non-profit and non-secretive space program back in March but we had no idea the group had a frickin’ submarine at their disposal. What you see above is the rocket on its floating launch platform. The submarine will haul [...]
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11:36
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remote-exploit & backtrack
i made 10gb for bt4 final.. after a week i use bt4, i got pop out tell me the disk is full.. i dont know what to delete anymore.. im not store my file in /home but it still full..
actually how and why this problem occurs?
how can i add size of bt4 partition without reinstall it??
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14:00
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Hack a Day
The iPad, announced earlier this week, has been a massive media extravaganza. Some people were elated, and some let down. We’ve been asked over and over what our thoughts on the device are. Join us after the break to find out.
[Caleb]–My grandma would love this. I really think that she is their target. It is [...]
