Axe Hacks: New Sounds For Your Electric Guitar Beginning From What Makes Them Tick

Creating music is a perfect hobby for anyone into hacking, and the amount of musical hacks and self-made instruments we come across here makes that supremely evident. It’s just a great match: you can either go full-on into engineering mode as music is in the end “just” applied physics, or simply ignore all of the theory and take an artistic approach by simply doing whatever feels right. The sweet spot is of course somewhere in between — a solid grasp of some music theory fundamentals won’t hurt, but too much overthinking eventually will.

The obvious choice to combine a favorite pastime like electronics or programming with creating music would be in the realm of electronic music, and as compelling as building synthesizers sounds, I’ll be going for the next best thing instead: the electric guitar. Despite its general popularity, the enormous potential that lies within the electric guitar is rarely fully utilized. Everyone seems to just focus on amp settings and effect pedals when looking for that special or unique sound, while the guitar itself is seen as this immutable object bestowed on us by the universe with all its predestined, magical characteristics. Toggle a pickup switch, and if we’re feeling extra perky, give that tone pot a little spin, that’s all there is to it.

The thing is, the guitar’s electrical setup — or wiring — in its stock form simply is as boring and generic as it can get. Sure, it’s a safe choice that does the job well enough, but there’s this entirely different world of tonal variety and individual controllability locked inside of it, and all it really takes is a screwdriver and soldering iron to release it. Plus, this might serve as an interesting application area to dive into simple analog electronics, so even if guitars aren’t your thing yet, maybe this will tickle your creativity bone. And if bass is more your thing, well, let me be ignorant and declare that a bass is just a longer guitar with thicker, lower-tuned strings, meaning everything that follows pretty much applies to bass as well, even if I talk about guitars.

However, in order to modify something, it helps to understand how it functions. So today, we’ll only focus on the basics of an electric guitar, i.e. what’s inside them and what defines and affects their tone. But don’t worry, once we have the fundamentals covered, we’ll be all settled to get to the juicy bits next time.

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Circle Guitar Creates Wall Of Sound

In the 60s a musical recording technique called the “wall of sound” came to prominence which allowed artists to create complex layers of music resulting in a novel, rich orchestral feeling. While this technique resulted in some landmark albums (Pet Sounds by the Beach Boys for example) it took entire recording studios and many musicians to produce. This guitar, on the other hand, needs only a single musician but can create impressive walls of sound on its own thanks to some clever engineering.

Called the Circle Guitar and created by [Anthony Dickens], the novel instrument features a constantly-rotating wheel around the guitar’s pickups in the body. Various picks can be attached in different ways to the wheel which pluck the strings from behind continuously. This exceeds what a normal guitar player would be able to do on their own, but the guitarist is able to control the sounds by using several switches and pushbuttons which control a hexaphonic humbucker and are able to mute individual strings at will. Of course, this being the 21st century, it also makes extensive use of MIDI and [Anthony] even mentions the use of a Teensy.

While details on this project are admittedly a little fleeting, the videos linked below are well worth a watch for the interesting sounds this guitar is able to produce. Perhaps paired with a classic-sounding guitar amplifier it could produce other impressive walls of sound as well. Either way, we could expect someone like [Brian Wilson] to be interested in one once it is in production.

Thanks to [Mel] for the tip!

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Some Strings Attached: Electric Tenor Guitar Built From Scratch

It’s no secret that we have a soft spot for musical instruments here at Hackaday, especially for the weird and unusual ones. An instrument that definitely fits the unusual category is the four-string tenor guitar, which — as legend has it — originated back in the 1920s by frankensteining a banjo neck and a guitar body together. Despite being around for almost a century, they’re still rarely found outside some niche genres, which makes them an excellent choice when pursuing a unique sound experience. As someone looking for exactly that, [Ham-made] decided to build an electric tenor guitar entirely from scratch, and documented every step of it at great length.

Built from two random chunks of wood, a dissected single coil pickup, and a leftover piece of elk antlers, the result is even more unique than the sound experience itself. While the rather unorthodox, faceted body shape leaves no doubt that this is a handmade instrument, the real eye-catcher has to be the neck and its oddly spaced frets. Counting the frets, the math doesn’t seem to add up either, as the twelfth fret usually creates the octave, and as such should be at half the scale length (i.e. half the string’s length from the bridge at the body’s end to the nut at the neck’s end). Turns out that [Ham-made] went for a diatonic scale instead of the usual chromatic one, essentially leaving out the notes you anyway wouldn’t play in a standard Pop or Rock setup. Using an all-fifths tuning akin to cellos and mandolins, this will work nicely over all four strings.

Aesthetics are certainly a subjective matter, and [Ham-Made] is fully aware that people might feel downright offended by his creation, but as he also wants to “embrace mistakes and promote experimentation”, he encourages everyone with similar aspiration to simply go for it — and he’s certainly no stranger to unconventional instruments and recording equipment. But before the never-tiring tonewood debate sparks up, check out this scrap metal guitar.

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Unique Musical Instrument Defies Description

Since the first of our ancestors discovered that banging a stick on a hollow log makes a jolly sound, we hominids have been finding new and unusual ways to make music. We haven’t come close to tapping out the potential for novel instruments, but then again it’s not every day that we come across a unique instrument and a new sound, as is the case with this string-plucking robot harp.

Named “Greg’s Harp” after builder [Frank Piesik]’s friend [Gregor], this three-stringed instrument almost defies classification. It’s sort of like a harp, but different, and sort of like an electric guitar, but not quite. Each steel string has three different ways to be played: what [Frank] calls “KickUps”, which are solenoids that strike the strings; an “eBow” coil stimulator; and a small motor with plastic plectra that pluck the strings. Each creates a unique sound at the fundamental frequency of the string, while servo-controlled hoops around each string serve as a robotic fretboard to change the notes. Sound is picked up by piezo transducers, and everything is controlled by a pair of Nanos and a Teensy, which takes care of MIDI duties.

Check out the video below and see if you find the sound both familiar and completely new. We’ve been featuring unique instruments builds forever, from not-quite-violins to self-playing kalimbas to the Theremincello, but we still find this one enchanting.

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A 3D-Printed Bass Guitar

A visit to the hardware hacking area of the recent Hacker Hotel hacker camp in the Netherlands would bring plenty of interesting pieces of hardware to delight the eye. Among them though was one to delight the ear, and on hearing it we asked whether its creator could put it online so we could share it with you. [XDr4g0nX]’s bass guitar is 3D printed, and while it still contains some non-3D-printed parts it’s still a very effective musical instrument.

This is not the first model he’s produced, he told us, an earlier guitar was entirely 3D-printed but proved not to be rigid enough. Tuning such an instrument merely resulted in its bowing out of shape and becoming unplayable as well as out of tune. This one has hefty steel bars for rigidity, though it uses a Yamaha neck rather than 3D-printing the whole instrument.  The main body of the instrument has to be printed in multiple parts and epoxied together, which he’s done without some of the ugly seams that sometimes disfigure prints of this nature.

Having heard it, we’d be hard pressed to tell it wasn’t a more traditional guitar, but then again since people have made guitars from all kinds of scrap it’s not the first home build we’ve encountered.

Barcode Guitar Plays More Than Beep-Bop

One of our favorite things about the rise of hobbyist development ecosystems such as the Arduino is that it’s now possible to make a MIDI controller out of almost anything, as long as you have the the shields and the dedication. We’re glad that [James Bruton] takes the occasional break from making robots to detour into instrument making, because his latest creation turns it up to 11.

This awesome guitar uses a barcode scanner to play notes, and various arcade controls to manipulate those notes. The barcodes themselves scan as ASCII values, and their equivalent integers are sent to an external MIDI device. This futuristic axe is built on an Arduino Mega, with a USB shield for the barcode scanner, and a MIDI shield on top that [James] connects to various synths in the video after the break.

In between shooting barcodes, the right hand also controls octave shifting and changing MIDI channels with the joystick, and doing pitch-bends with the rotary encoder. The array of arcade buttons on the bottom neck let him switch between single player for monophonic synths, and multiplayer for polys. The other three buttons are press-and-scan programmable single-note sounders that assist in chord-making and noodling.

We particularly dig the construction, which is a combination of 20/20 and 3D printed boxes. [James] found some angled PVC to serve as fretboards for the four necks, and a nice backgrounds for bar codes.The only thing we would change is the native beep of the barcode scanner — either silence it forever or make it mutable, because it doesn’t jive with every note. It might be nice to get the gun to scan continuously so [James] doesn’t get trigger finger. Or better yet, build the scanner into a glove.

Want to do something more useful with that barcode scanner in your parts bin? Use it to manage your household inventory. But first, reacquaint yourself with the history of the humble barcode as presented by [Adam Fabio].

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Guitar Made From Noodles Glows In The Dark

Wood.  Specifically, certain types of tone woods; woods that impart a certain tone. That’s what guitars are made of. And occasionally, plastic, or metal, or fibreglass or, well, anything. [_forwardaudio_] built his out of noodles, because, why not?

Well, not completely out of noodles. Epoxy is used to give some strength to the noodles, because, despite the fantastic tone that noodles impart to the guitar, they’re not known for their strength. The epoxy helps keep the noodles in place, focusing their noodly tone.

To add a bit of punch to the look of the guitar, the back and front of the body have UV powder blended in, blue on the front and green on the back. Once the guitar was assembled, a set of UV strings were added as well, to add even more glowy goodness.

In the video (after the break) the build process is shown along with the simplified, volume only, wiring. At the end, [_forwardaudio_] noodles around on the guitar a bit.

I’ll show myself out.

If noodles aren’t your thing, maybe you’d prefer 3D printing an extended fretboard for your guitar, or to build yourself a 12 foot long guitar.

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