Popular Electronics Magazine Archive Online

They began publishing Popular Electronics magazine in 1954, and it soon became one of the best-selling DIY electronics magazines. And now you can relive those bygone days of yore by browsing through this archive of PDFs of all back issues from 1954 to 1982.

Reading back through the magazine’s history gives you a good feel for the technological state of the art, at least as far as the DIYer is concerned. In the 1950s and 1960s (and onwards) radio is a big deal. By the 1970s, hi-fi equipment is hot and you get an inkling for the dawn of the digital computer age. Indeed, the archive ends in 1982 when the magazine changed its name to Computers and Electronics magazine.

It’s fun to see how much has changed, but there’s a bunch of useful material in there as well. In particular, each issue has a couple ultra-low-parts-count circuit designs that could certainly find a place in a modern project. For example, a “Touch-Controlled Solid State Switch” in July 1982 (PDF), using a hex inverter chip (CD4049) and a small handful of passive components.

But it’s the historical content that we find most interesting. For instance there is a nice article on the state of the art in computer memory (“The Electronic Mind — How it Remembers”) in August 1956 (PDF).

Have a good time digging through the archives, and if you find something you really like, let us know in the comments.

Smartphone VR Viewer Roundup

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In June 2014, Google revealed a low-cost Smartphone Adapter and VR SDK at their annual software developer conference in San Francisco, California. During the event, Google handed out 6,000 cardboard kits and released a tutorial online, which prompted homemade versions to surface on the web within three hours. This then sparked an iPad case manufacturer to fashion together their own cardboard VR kit that could be bought for $25. After a week, Google gained over 50,000 downloads of their cardboard Android app.

Although the popularity of this VR viewer skyrocketed extremely fast, the idea for a cheap VR solution is nothing new. Developers have been experimenting with these types of objects for years. In fact, a group of Cupertino high school sophomores debuted a similar device called ‘Face Box’ at an entertainment and technology conference at Stanford University on June 17, more than a week before Google’s I/O presentation. A few months earlier, researchers at the Mixed Reality Research Lab (MxR) at USC launched an open source DIY VR website that showed how to create virtual reality headsets with a 3D printer. The smartphone enabled head-mounted display had schematics for both Android and iPhone. The MxR lab was where [Palmer Luckey] worked at as an engineer before founding Oculus (the company that Facebook eventually acquired for approximately $2 billion). So when [Palmer] saw that Google released their cardboard kit, he vocalized his opinion by calling it a clone of his colleagues’ research on Reddit.

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NPR Science Friday Roundup

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UPDATE: Listen to the segment here.

Did you know I’m going to be a guest on NPR Science Friday today? If this is the first you’re hearing about it you need to sign up for the mailing list (there’s a sign-up form in the right hand column of this page).

If you’ve already listened to the show and found your way here for the goods on the projects, don’t worry. We’ve got you covered. Join us after the break for project links and details.

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Best robot demos from ICRA 2013

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The 2013 IEEE International Conference of Robotics and Automation was held early in May. Here’s a video montage of several robots shown off at the event. Looks like it would have been a blast to attend, but at least you can draw some inspiration from such a wide range of examples.

We grabbed a half-dozen screenshots that caught our eye. Moving from the top left in clockwise fashion we have a segmented worm bot that uses rollers for locomotion. There’s an interesting game of catch going on in the lobby with this sphere-footed self balancer. Who would have thought about using wire beaters as wheels? Probably the team that developed the tripod in the upper right. Just below there’s one of the many flying entries, a robot with what looks like a pair of propellers at its center. The rover in the middle is showing off the 3D topography map it creates to find its way. And finally, someone set up a pool of water for this snake to swim around in.

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A collection of hands to inspire your Halloween animatronics

Jump scares are a lot of fun, but if you want to hold the attention of all those trick-or-treaters we’d suggest a creepy prop. One of the best choices in that category is a ghoulishly lifelike hand. You can draw some inspiration from this roundup of robot hands which Adafruit put together.

We’ve chosen four examples for the image above but there are more to be had than just these. In the upper left there is a laser-cut acrylic hand that actually features some force sensitive resistors on the fingertips to help implement some haptic feedback. This project was inspired by the hand seen in the lower right which uses flex sensors on a glove to control the bot’s movement. If you’re looking for something more realistic the 3D printed parts on the lower left are the best bet. But if you’re looking to put something together by Halloween night the offering in the upper right is the way to go. It’s hacked together using cardboard templates to cut out plastic parts and using polymorph to form joints and brackets.

Comparing Altium and Cadence PCB layout tools

We see a lot of projects using Eagle for the schematics and PCB layout. There are a few that use Kicad, but we hear very little about other alternatives. Recently, [Limpkin] has been working with Altium and Cadence and wrote about how they compare when it comes to PCB layout. Neither are free packages so it’s good to know what you’re getting into before taking the plunge.

[Limpkin] begins his overview by mentioning that the schematic editors are comparable; the differences start to show themselves in the PCB layout tools. Here you can see that Altium always labels the pads so you know what net each of them belongs to. Cadence (whose PCB layout tool is called Allegro) will display the net if you hover over the pad with your mouse. Both have 3D rendering, with Altium’s looking a bit more pleasant but what real use is it anyway? Okay, we will admit we love a good photorealistic board rendering, but we digress. The most interesting differences show themselves once traces are all on the board and need to be rejiggered. Cadence will actually move traces on other layers automatically to avoid collision with a via that is late to the party, and Altium shows some strange behavior when dragging traces. [Limpkin] doesn’t register a final judgement, but the comparison alone is worth the read.

Improvised weapons roundup

There’s something special about improvised weapons built for the upcoming zombie apocalypse. Whether it’s a Lousiville Decapitron or a shotgun revolver, we’re always fascinated by homemade weapons. Here’s a few that rolled into the tip line over the last few weeks:

You call that a knife?

[Joerg Sprave], a.k.a. that German guy on YouTube that has fun with slingshots, built a spinning steak knife saw thing. Basically, it’s eight steak knives attached to a wheel and driven with an electric drill. It’s not a terribly complex build, but it does give off a zombie apocalypse/first person shooter melee weapon vibe.

Battery cannon, because why not

Why use potatoes when you can use D-cell batteries? [CasterTown] on YouTube put together a small propane-powered spud gun that can put a battery through a car door. This isn’t the first time we’ve seen batteries used as ammo, but it’s still an extremely powerful build.

Oh man the 60s were cool.

Back in the 60s, safety wasn’t a huge concern. Any 10-year-old could walk into a dime store and buy Jarts – a game consisting of kids throwing sharp spikes at each other. Also, magazines had descriptions of how to build a freaking mortar in a backyard. Able to make a 20-foot grouping at 1900 feet, this would probably merit a visit from a SWAT team today. Needless to say, don’t try this at home.

Don’t do this. Please.

Last but not least is [Rocketlab] and [SadisticTheory]’s $15 flamethrower. It’s just a gas tank from a 2-stroke engine, a 12 volt battery and a pump. Common sense requires us to mention this build is very, very illegal (apparently it is legal)and extremely unsafe. Don’t replicate this build.

Actually, we take that back. You shouldn’t build any of these weapons because they’re very dangerous. Just think of these as a neat thing to look at. Let other people hurt themselves. You may complain about how unsafe these weapons are in the comments.