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Nuts to the Midigun, we’re talking gauss pistols today. The gun works by accelerating a projectile through a pair of coils. Is it dangerous? Only indirectly: There is 440V across the capacitor terminals. It is kinda heavy, so you could throw it at someone. The laser sight could cause eye damage. The small parts are a choking hazard. Finally, it has about the same power as a pellet gun, but the projectile is much heavier so it moves a lot slower. All the info you need can be found in the FAQ.
There comes a time in every maker’s career where solderless breadboards won’t do, perfboard becomes annoying, and deadbug is impossible. The solution is to manufacture a PCB, but there’s a learning curve. After learning a few tricks from [Scott]‘s awesome DIY PCB guide, it’s easy to make your own printed circuit boards.
There are a few basic steps to making a PCB. First is designing the board in Eagle or KiCad. The next step, putting the design into copper, has a lot of techniques to choose from. Photo transfer, direct printing, and CNC milling have huge benefits, but by far the most common means hobbyists produce boards is with toner transfer using a laminator.
Unless you’re doing SMD-only circuits, a drill is required. Most people can get away with a Dremel or other rotary tool, but Hackaday has a favorite drill press that is perfect for drilling holes in FR-4. In part two of [Scott]‘s tutorial, he goes over solder masks, silk screens before jumping into vias. These small bits of copper conducting electricity through a circuit board are extremely hard for the garage-bound builder to achieve on their own, but there are a few solutions – copper rivets (anyone have a US source for these?) and copper foil can be used, but sometimes the most effective solution is just hitting the board with a lot of solder and heat.
Thanks [Upgrayd] for the title pic.
[dimovi] had a spare LCD monitor sitting around and thought it would be great to convert it into a “privacy” monitor.
The process is simple enough for anyone comfortable with disassembling electronics. He took apart the monitor’s plastic frame, cutting out the polarized film with a utility knife. Once the film was removed, he spent some time removing the film adhesive from the glass panel using a combination of Oops cleaner and paint thinner.
He reassembled the monitor, which now shines a bright white regardless of what is actually being displayed on the screen. He removed the lenses from a pair of theater 3D glasses, replacing the plastic with the film he removed from the monitor.
Now, [dimovi] is the only one who can see what’s he is doing on his computer, which is just the way he likes it.
While there’s not a lot of magic going on behind the process, we think it’s a neat way to reuse an old monitor.
Reader [Mikey Sklar] told us about a review he wrote covering 3 different models of pocket multimeters. We’re sure that you’ve had the same experiences we have being the go-to-guy or got-to-gal for all things electrical. For our sort, having a multimeter on hand at all times has become an expectation.
[Mikey] looks at a model from ebay, Harbor Freight, and Radio Shack. Not surprisingly, the ebay offering doesn’t rate too well but does get the job done. We were surprised to read that he picked up the Cen-Tech model for about $10 at Harbor Freight. Although it may no longer be sold there (we haven’t checked) [Mikey] seems pretty happy with it so we’ll be on the lookout during our next tool-buying trip. We’re unfamiliar with the tiny Radio Shack 22-820 but we’ve always been happy with our larger 22-811. The 22-820 allows the probes to be folded up inside of the case cover for a truly pocketable package.
You can never have too many meters at your disposal and we’ll have to keep this article in mind the next time we’re shopping for another. Never used a multimeter before? Take a look at the tutorial [Mikey] linked to over at ladyada.
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.