Category Archives: misc hacks

Magnets and Printed Parts Make Quick-Disconnect Terminals

The Apple MagSafe power connector is long gone from their product line, but that doesn’t mean that magnetic connectors aren’t without their charms. It just takes the right application, and finding one might be easier with these homebrew magnetic connectors.

We’ll admit that the application that [Wesley Lee] found for his magnetic connectors is perhaps a little odd. He’s building something called Linobyte, a hybrid art and electronics project that pays homage to computing history with very high-style, interactive core memory modules. The connectors are for the sense wire that is weaved through the eight toroids on each module, to …read more

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Posted in connector, core memory, Curie point, magnet, magsafe, misc hacks, neodymium, rope | Leave a comment

What’s the Difference? Ask an Op Amp

If you’ve ever wondered why an op amp has the little plus and minus symbols on it, its because at the heart of it, the device is a differential amplifier. The problem is that — ideally, at least — it has infinite gain so it works like a comparator and that’s not what you usually want. So we put resistors around the thing to constrain it and get useful amplification out of it. [Stephen Mendes] does the analysis for you about how the standard configuration for a differential amplifier works. He assumes you know the stock formulae for the inverting …read more

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Posted in circuit analysis, differential amplifier, misc hacks, op-amp, superposition | Leave a comment

A Fleet of Pressure Washers Powers This Interactive Public Fountain

Public art installations can be cool. Adding in audience interactivity bumps up the coolness factor a bit. Throw civic pride, dancing jets of water, music, and lights into the project, and you get this very cool pressure washer powered musical fountain.

The exhibit that [Niklas Roy] came up with is called Wasserorgel, or “water organ”, an apt name for the creation. Built as part of a celebration of industry in Germany, the display was built in the small town of Winnenden, home to Kärcher, a cleaning equipment company best known for their line of pressure washers in the distinctive …read more

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Posted in Arduino Mega 2560, art, fountain, interactive, keyboard, midi, misc hacks, organ, pressure washer | Leave a comment

Pint-sized Jacob’s Ladder Packs 10,000 Volts in a Pickle Jar

File this one away for your mad scientist costume next Halloween: [bitluni]’s Pocket Jacob’s Ladder is the perfect high voltage accessory for those folks with five dollars in parts, a 3D printer, and very big pockets.

[bitluni]’s video shows you all the parts you’ll need and guides you through the very simple build process. For parts, you’ll require a cheap and readily-available high-voltage transformer, a battery holder, some silver wire for the conductors, and a few other minor bits like solder and a power switch.

Once the electronics are soldered together, they’re stuffed inside a 3d printed case that [bitluni] …read more

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Posted in 3d printed, freecad, high voltage, jacob's ladder, misc hacks, science | Leave a comment

Save a Few Steps on Your Next Build with These Easy Linear Actuators

A lot of projects require linear motion, but not all of them require high-accuracy linear slides and expensive ball screws. When just a little shove for a door or the ability to pop something up out of an enclosure is all you need, finding just the right actuator can be a chore.

Unless someone has done the work for you, of course. That’s what [Ali] from PotentPrintables did with these 3D-printed linear actuators. It’s a simple rack-and-pinion design that’s suitable for light loads and comes in two sizes, supporting both the 9-g micro servos and the larger, more powerful version. …read more

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Posted in 3d printed, actuator, continuous rotation, CRS, misc hacks, rack and pinion, servo, stl | Leave a comment

A Cow-Powered Human Centrifuge

Spoiler alert: group of fun-loving French folks build an animal-or-human-powered merry-go-round that spins fast enough to fling all takers into the lake (YouTube, embedded below). Actually, that’s basically it. The surprise is ruined, but you probably want to check out the video anyway, because it looks like a ton of fun.

Granted, you may not have a well-stocked metal shop or a team of oxen up by the lake wherever you live, but there are certainly details in the video that will survive in translation. Basically, the team took the axle off of a junked car, attached it to a …read more

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Posted in mad cow, merry-go-round, misc hacks, summer, watersports | Leave a comment

A Tour Through the Archetypical Asian Factory

Overseas factories can be sort of a mythical topic. News articles remind us that Flex (née Flextronics) employs nearly 200 thousand employees worldwide or that Foxconn is up to nearly a million. It must take an Apple-level of insider knowledge and capital to organize such a behemoth workforce, certainly something well past the level of cottage hardware manufacturing. And the manufacturing floor itself must be a temple to bead blasted aluminum and 20 axis robotic arms gleefully tossing products together. Right?

Well… the reality is a little different. The special sauce turns out to be people who are well trained …read more

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Posted in Asia, china, factory, factory tour, freewrite, manufacturing, misc hacks, tour, video | Leave a comment

Faux Walkie-Talkie for Comedy Walking Tour is a Rapid Prototyping Win

Chances are good that a fair number of us have been roped into “one of those” projects before. You know the type: vague specs, limited budget, and of course they need it yesterday. But you know 3D-printers and Raspberduinos and whatnot; surely you can wizard something together quickly. Pretty please?

He might not have been quite that constrained, but when [Sean Hodgins] got tapped to help a friend out with an unusual project, rapid prototyping skills helped him create this GPS-enabled faux-walkie talkie audio player. It’s an unusual device with an unusual purpose: a comedic walking tour of Vancouver “haunted …read more

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Posted in arduino, audio, augmented reality, codec, comedy, gps, Holiday Hacks, misc hacks | Leave a comment

Wave-Powered Glider Delivers Your Message In A Bottle

Setting a bottle adrift with a message in it is, by most measures, an act of desperation. The sea regularly swats mighty ships to their doom, so what chance would a tiny glass bottle have bobbing along the surface, subject as it is to wind, waves, and current? Little to none, it would seem, unless you skew the odds a bit with a wave-powered undersea glider to the help the bottle along.

Before anyone gets too worked up about this, [Rulof Maker]’s “Sea Glider” is about a low-tech as a device with moving parts can be. This craft, built from …read more

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Posted in message in a bottle, misc hacks, sea glider, submarine | Leave a comment

Reverse Engineering CMOS

ICs have certainly changed electronics, but how much do you really know about how they are built on the inside? While decapsulating and studying a modern CPU with 14 nanometer geometry is probably not a great first project, a simple 54HC00 logic gate is much larger and much easier to analyze, even at low magnification. [Robert Baruch] took a die image of the chip and worked out what was going on, and shares his analysis in a recent video. You can see that video, below.

The CMOS structures are simple because a MOSFET is so simple to make on an …read more

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Posted in cmos, decapsulation, IC fabrication, misc hacks, reverse engineering | Leave a comment