Old School High Voltage Capacitance

September 17, 2008 by Caleb Kraft 29 Comments

What would MacGyver do if he needed a high voltage capacitor but only had some foil, tape, water, salt, a nail and a plastic jug? He would build a salt water Leyden jar, that’s what. The Leyden jar is a very simple capacitor. Invented in 1745, it has been integral to many scientific experiments. Check the wikipedia entry to learn more about the history.

This specific type is quite easy to make. It uses a salt water interior instead of foil on the inside and outside. That means you could slap one of these together in a few minutes to impress your friends and/or electrocute yourself accidentally. Please be careful as this is high voltage.

How-to: Thermite Hard Drive Destruction

September 16, 2008 by Jason Rollette 123 Comments

After the overwhelming response to the Hackit we posted about automated hard drive destruction last fall, we finally decided to test out some thermite hard drive destruction ourselves. This has been done on The Screen Savers but they did not show up close results of the platters. So, aluminum and black iron oxide were procured through eBay, and until it arrived we watched some YouTube videos that showed a lot of fire and no real results. We decided to see what it would take to completely obliterate a drive.

With the amount of personal data stored on your computer, we all understand the importance of destroying the data that is stored on the platters of a hard drive before disposing of it. There are many ways to destroy a hard drive; software, physical disassembly, drills, hammers, magnets/electromagnets, and acid, but none are quite as outrageous and dangerous as thermite. That’s what we’re going to do here today. Follow along for pictures and videos of the results.

Continue reading “How-to: Thermite Hard Drive Destruction” →

Arcade Cabinet That Plays Every Game In The Universe

September 16, 2008 by Caleb Kraft 9 Comments

Ok, maybe we’re exaggerating a little bit. It may not play every game in the universe, but the CMACC gets pretty close. CMACC stands for “Complete – Multi Arcade Console Computer System” and is comprised of a giant pile of gaming goodness. [Mayhem] packed a PC, Xbox, Xbox360, Dreamcast, Wii, PSP, and a DS into the cabinet. He seems to have overlooked the Virtual Boy though.

He’s using GamEx as a front end for a multitude of emulators, including MESS which emulates tons of old desktops like Commodores and Apples. The cabinet, while not as elegant as the Retro Space, wins major geek points for the cup holder.

[via Engadget]

Parts: Tactile Switches For Your Next Project

September 15, 2008 by Ian 11 Comments

Electronics parts can be a pain to choose. It’s often hard to tell from manufacturers’ datasheets if a part will fit your design. We auditioned six different tactile switches to find a cheap button to use in upcoming projects. A tactile switch, also called a momentary button or push-to-make switch, is commonly used for input and microcontroller resets. This type of button creates a temporary electrical connection when pressed.

Footprints for most of these buttons are available in the Cadsoft Eagle library switch-tac, or in the Sparkfun parts library under TAC_SWITCH. Buttons in the image above are discussed from left to right. Continue reading “Parts: Tactile Switches For Your Next Project” →

LED Random Blinking Mood Lighting

September 15, 2008 by Caleb Kraft 7 Comments

What is it about pseudo random flashing LEDs that make us go gaga? We don’t know, but there’s definitely something there. [seligtobiason] has this obsession too. After seeing several more complicated projects, he created this elegant, simple, and cheap piece of art. The entire thing is pretty much just some flashing LEDs, some resistors, and a power supply. It really isn’t anything groundbreaking, but the effort and cost involved are tiny compared to some other similar projects. sure, it doesn’t synchronize over time based on input like the firefly project. But for a quick cheap project, the results are quite nice.

We would put one in our home, right next to the node blinky.

Pong Clock

September 14, 2008 by Eliot 5 Comments

[funnypolynomial] saw this Pong clock years ago and had been planning on building his own version. With a move looming he decided it was finally time to finish up his Pong clock since completed projects take far less room than incomplete ones. The core of the system is a ThinkPad. He separated the hinge and bolted the keyboard to the back of the screen. The display ribbon was long enough, but he had to extend the wires for the backlight. The power button was also extended and the battery removed. The software is a Windows screen saver that uses the two mouse buttons for navigation similar to how you set a two button watch. Every minute the the left player misses the ball and the right player’s score increases. You can see a video of the clock below. In the past, he also turned a digital multimeter into a clock. Continue reading “Pong Clock” →

Xbox 360 Wireless Visual Interface

September 13, 2008 by Eliot 8 Comments

[jon barber] pointed out another great project on the benheck forums that hasn’t gotten much attention. [techknott] built a wireless video interface for his Xbox 360. Think of it as a sort of video game thin client. It has the form-factor of a portable but doesn’t include the 360’s components. Instead it has a 1.2GHz A/V receiver and the guts of a wireless controller. The specific transmitter was chosen because it wouldn’t interfere with the 2.4GHz controller. The power supply is two 2600mAh batteries running at 7.5V with a built in charging circuit. The draw from the screen is ~500mA. The entire unit is 1 inch thick.