Circuit Building With A Hammer And Nails

real_breadboarding

[Collin Cunningham] over at Make recently wrapped up another edition of “Collin’s Lab” – this time around, the subject is breadboards. He starts off by discussing a common solderless breadboard, something you are no doubt familiar with. What you might not know however is how breadboards got their name.

Way back when, before there was a RadioShack in every strip mall across the country, fancy prototyping supplies like your solderless breadboard did not exist. Amateur radio operators would prototype circuits on wooden boards, often using whatever was around as a substrate. Many times, this meant that the family’s cutting board ended up as a makeshift prototyping station.

One popular method of building circuits was to drive small nails into the breadboard, using wire wrapping to connect things together. [Collin] demonstrates this technique in the video, constructing a simple LED flasher circuit.

He says that the process works decently enough, and was kind of fun to do. He does mention however that building any sort of circuit requiring an IC would likely be out of the question.

If you have a few minutes to spare, check out the video embedded below – [Collin’s] take on technology is quirky and entertaining as always.

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Building An Augmented Reality Display Using Obsolete Technology

slideprojector_augmented_reality

Augmented reality might be all the rage these days, but when you take a closer look at the technology, you will find that these sorts of optical illusions are not new at all.

Artist [Sebastian Schmieg] was pondering augmented reality for a bit and decided he could replicate the effect using old and obsolete technology. His creation, called “81 Points of View”, uses an old Kodak slide projector and an elaborate mechanical setup to simulate the effect.

The slide projector resides on a platform that can be rotated around its center in 81 steps. After each movement, the mechanism swaps out the current slide, selecting the next image depending on which direction the user turns. The resulting effect is similar to the implementations of augmented reality you might see today, with a 3d visualization superimposed on the surrounding room.

The concept dates back all the way to the 1860’s, when [John Pepper] first demonstrated the technique. Using mirrors and panes of glass, he was able to project translucent images in front of his audience, which is the same idea [Sebastian] uses in his project. You are likely quite familiar with the effect, if you have ever visited the Haunted Mansion at a Disney theme park.

It’s a neat project, though the resultant augmented reality display is obviously not quite as smooth as you would see from a smartphone. Either way, it is definitely worth checking out. Keep reading to see a video of the project in action.

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Mechanical Turing Machine Can Compute Anything…slowly

mechanical_turing_machine

For several years, [Jim] has wanted to construct a fully-mechanical universal Turing machine. Without the help of any electronic circuits or electrical input, his goal was to build the machine using simple hand tools and scrap materials.

If you are not familiar with the concept of a Turing machine, they are devices that manipulate symbols or input from a strip of tape, according to a set table of rules. By definition, a Turing machine should be adaptable to simulate the logic of any computer algorithm, albeit in a much slower fashion than you would see from a computer.

He has replaced the strip of tape with a wire grid, and the symbols have been implemented in the form of ball bearings placed on the aforementioned grid. His hand-cranked machine uses magnets to lift the input symbols from the grid, processing them according to the rules table he routed out of a wood block.

The implementation is definitely clever, though [Jim] admits it is not without its problems. He took it to Maker Faire UK, and most people didn’t quite understand what they were seeing without a full explanation.  The machine is not quite as reliable as he would like it to be, and he would like to make it a bit more powerful as it currently would take months to add two numbers together.

Keep reading to see a brief video demo of his Turing machine in action, and check out his blog if you want to see more information on how the machine was built.

Interested in seeing more Turing machines? Check out these two machines we featured a while back.

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CD Phonograph Brings Old-time Charm To Modern Music

phonograph

[Jozerworx] had always wanted to build a CD player that looked like an old-time Victrola Phonograph player, though he never seemed to be able to find the time to do it. With all of his other projects out of the way, he decided to finally get started on building his phonograph.

He went garage sale hunting and found the perfect base for his project – an old wooden box adorned with tarnished brass hardware. He started in on the project immediately, dismantling a cheap CD player and mounting the motor/laser assembly on the top of the box. The CD player internals were installed inside the wooden box, along with a small audio amplifier stripped from a portable iPod speaker.

A brass horn was fashioned out of an ornament, in order to complete the phonograph feel, but also to act as a passive amplifier. He then mounted a series of switches on the top of the box to allow him to control the CD player’s basic functions.

[Jozerworx] says that it sounds decent, though there are some things he would change. He plans on switching out the audio amplifier and possibly the speakers at some point in the future. He is also still keeping his eye out for a larger, and more effective horn.

A 555 Synthesizer

Inspired by the memory of a childhood electronics kit, [Frank] decided to make a new 555 Synthesizer and enter it into the 555 contest. [Frank’s] remake is played with a stylus, and sports an attack and release envelope circuit, housed in a quick but effective acrylic case.

Using a single 555 timer, a hand full of capacitors, two transistors, and a healthy dose of resistors and potentiometers, the sound is quite impressive thanks to optional filtering, enveloping, and a lot of fine tuning. Full schematics, bill of materials, formulas, and board files are all available along with sources for some of the more specialized potentiometers.

Join us after the break for a ~13 minute long video, which is pretty cool, as it shows the device from prototype, and does some fast forward action though to the final product pictured above, though if you just want a demo of the 555 synth fast forward to 10:44

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DSLR Bellows-mounted Lens Retrofit

dslr_lens_retrofit

While digging through a pile of old camera equipment, [Jake] stumbled upon a camera that belonged to his grandfather and was curious to see what sorts of images the old lens would produce. He wasn’t interested in messing around with a film-based camera for his experiments, so he needed to find a way to mount the vintage lens on his newer Canon DSLR.

After considering several options including custom machined adapters and mounting rings built from old Canon lenses, he found a much cheaper solution. He purchased a lens adapter made to mount a particular type of lens to a modern DSLR, and then modified it to fit his lens. It worked perfectly, though he admits the resulting images are not that different than those taken with his regular lens.

Underwhelmed with the images, he decided to mount the lens on a set of bellows he picked up at the local dump. It looks pretty neat, but he has yet to get a chance to take any pictures with his new setup. Hopefully we’ll see some test shots soon.

If anyone has experience with using bellows lenses on a modern DSLR, we’re always up for seeing some sample pictures. In the meantime, check out this other DSLR/bellows hybrid project we featured a short while back.

[via BoingBoing]

Old School LED Light Show

programmable_lightshow

Building LED arrays that can display all sorts of different patterns is pretty easy these days. Hook up an Arduino, do some charlieplexing, and off you go. When [Viktor] was younger he didn’t have all those fancy schmancy microcontrollers and circuit simulation software you kids have these days. In fact, last we heard, he had to walk to school uphill both ways – in the snow.

That didn’t stop him from building this gem of a project back in 1987. His LED chaser/light show does not use any microcontrollers at all, rather it relies on an EPROM to store predefined display programs. A series of switches are installed on the front of the flasher, allowing him to easily switch between the programs, and a pot is mounted to the front of the device to control the speed of the LEDs.

His light show is pretty slick, even for a project built over 20 years ago. Sometimes you just can’t beat a good, old-school hack.

Continue reading for a video demonstration of [Viktor’s] programmable light show.

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