The Effects Are IN The Guitar? It’s So Simple…

October 7, 2014 by Bryan Cockfield 21 Comments

We’ve all had that problem. Up on stage, rocking out Jimi Hendrix-style on guitar with your band, but frustrated at having to mess around with foot pedals to control all of the effects. [Richard] solved this problem in a unique way: he put a preamp and a microcontroller in a guitar that can create some very interesting effects.

For the musically challenged, electric guitars often have several sets of electromagnetic pickups that detect vibrations in the strings at different points along the strings. Selecting different pickup combinations with a built-in switch changes the sound that the guitar makes. [Richard] wired the pickups in his Fender Stratocaster to the microcontroller and programmed it to switch the pickups according to various patterns. The effect is somewhat like a chorus pedal at times and it sounds very unique.

The volume and tone knobs on the guitar are used to select the programmed patterns to switch various pickups at varying speeds. This has the added bonus of keeping the stock look of the guitar in tact, unlike some other guitars we’ve seen before. The Anubis preamp, as it is called, is a very well polished project and the code and wiring schematic are available on the project site along with some audio samples.

Illumaphone Uses Light To Make Music

October 5, 2014 by James Hobson 9 Comments

Move aside Theremin, we have another crazy instrument that relies on its musicians to frantically wave their arms around to produce a beat. This is the Illumaphone.

[Bonnie Eisenman] recently took a course on Electronic Music, and for her final project she was allowed to basically do whatever she wanted — so she chose to create a custom musical instrument. It’s fairly simple on the hardware side, making use of coffee cups, an Arduino Uno, six photo-resistors, some alligator clips and a whole bunch of cardboard — but don’t let the lackluster parts list fool you, it actually works quite well for what it is!

Each coffee cup is a different note, and the amount of light that gets into the cup determines its volume and vibrato. It even auto-calibrates to the ambient light levels when it is first setup! The light level data is interpreted by the Arduino which then sends it to a laptop standing by, which uses a software called ChucK to synthesize the notes for output.

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The Teensy Becomes An MPC

October 4, 2014 by Brian Benchoff 8 Comments

A staple of every recording studio today, the Akai MPC began as a simple sampling groove box in the early 90s. The form factor of a few force sensitive pads assignable to different samples should be familiar to anyone with a little bit of MIDI gear, but these are rarely custom-made devices. Now, it runs on a Teensy. [Michele] created his own MPC-style MIDI pad controller with the Teensy 3.0, the Teensy audio adapter board, and an ingenious PCB design that uses replacement MPC pads.

[Michele]’s MPC was first featured in the MIDI hacklet, but back then the only working component was the pads themselves. The velocity sensitive pads are made of two copper traces laid on a single acetate sheet. A bit of Velostat is glued to the back of the pad so when the pad is pressed, it contacts both of the traces. The harder the pad is pressed, the lower the impedance, and with everything sent to an analog pin, each pad becomes a force sensitive resistor.

With the key feature of an MPC taken care of, [Michele] turned his attention to the sampling and software of his device. The new Teensy 3.0 audio adapter board – and a great new library – takes care of everything. [Michele] doesn’t have a proper video of his MPC up yet, but he was able to film a random guy playing his machine at Rome Maker Faire yesterday. You can check that out below.

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Sweet Stepper Of [Jeremy]’s Rocks Out With Its Box Out

September 18, 2014 by Kristina Panos 12 Comments

Inspired by the floppy drive orchestras of others, [Jeremy] has built a Pi-driven MIDI music box with stepper motor resonators and outlined the build on hackaday.io.

Control for the motors comes from an Iteaduino Mega 2560. The music starts as a MIDI file, gets processed into a text file, and is played over serial by a Raspberry Pi. He’s added percussion using K’NEX instruments and 9g servos, which we think is a nice touch. It can be powered via LiPo or from the wall, and [Jeremy] baked in protection against blowing up the battery. As he explains in the tour video after the break, the box is clamped to a wooden table to provide richer sound.

[Jeremy]’s favorite part of the build was enclosing the thing as it was his first time using panel-mount components. Stick around to see a walk-through of the guts and a second video demonstrating its musical prowess.

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Using A Theremin For Medical Applications

September 17, 2014 by Mathieu Stephan 30 Comments

[Eswar] is not an ordinary 16 years old boy. He figured out a noninvasive way to measure breathing in hospitals for less than $50. He is using a theremin to measure the rise and fall of a patient’s chest. For our curious readers, this touch-less instrument was invented back in 1929 by the Russian inventor [Leon Theremin]. It uses the heterodyne principle and two oscillators to generate an audio signal. One electronic oscillator creates an inaudible high pitch tone while another variable oscillator is changed by adding capacitance to an antenna.

As you can guess the space between the patient’s chest and the antennas placed around the bed forms a tiny capacitor which varies when exhaling. With three simple TTL chips and a little guessing [Eswar] had a working prototype ready to be implemented in the real world. If you’re interested in theremin, we invite you to see one of our previous articles on how to make one in a few minutes with a soda can.

Sweet Guitar Practice Amp Is A Literal Work Of Art

September 13, 2014 by Rich Bremer 19 Comments

Check out this ~~odd~~ different looking guitar practice amp. It looks like a professionally manufactured product but it certainly is not. [Bradley] made it himself, not just a little bit of it either, all of it.

One of the first things you notice is the quilted maple wood grain of the case. There is no veneer here, this started out as a solid maple block. The front radius was shaped and the recesses for the control knobs and input jack were bored out using a forstner bit. The case was sanded smooth and several coats of high gloss tung oil was rubbed on to give the wood a perfect finish. A small piece of grill cloth protects the speaker while adding a little more class to the amp. The bottom of the case is actually a cover for a computer hard drive. A rectangular hole cut in the hard drive cover makes way for a 9 volt battery compartment.

There are two control potentiometers, one for volume and one for gain. Any old knobs wouldn’t do for this project. [Bradley] knurled and turned his own aluminum knobs and they look awesome! The units power is turned on when the guitar cord is plugged in. An LED not only indicates that the power is on but it also gets brighter with the volume input from the guitar. The LED also pulses if two strings are out of tune with each other giving the guitarist an opportunity to tune one of the strings until the LED stops pulsing. When it is time for some private jamming headphones can be plugged into the amp and doing so cuts power to the speaker.

The electronic circuitry is [Bradley’s] design also, but unfortunately he doesn’t share the schematic. I suppose he wants to keep his amp one-of-a-kind.

Pro-Quality Pickup Winder You Can Make At Home

September 12, 2014 by Rich Bremer 24 Comments

A lot of people find the art of building a guitar to be a worth while and pleasurable hobby. The task can be as easy as buying pre-made parts and assembling the guitar or as complicated as starting with just a piece of wood. Even advanced guitar builders normally do not get involved enough to wind their own pickups as it can be a tedious and labor intensive task. A low-end professional pickup winder can be purchased for about $450 which is certainly not economical for the hobbyist. [Doug] is one of those folks that wanted a pickup winder but didn’t want to shell out the big bucks. So what did he do? Build his own, of course.

If [Doug] was going to build a winder he was going to do it right, with all the features to make pickup winding as quick and painless as possible. The winder needed to be fast, count the windings and stop after a pre-programmed amount of revolutions. To keep this machine safe and reliable while maintaining the ability to spin quickly, [Doug] chose to base the machine on an off-the-shelf wood lathe since they are sturdy and made to spin at high speeds. The lathe is equipped with a face plate where the pickup is mounted.

Once the pickup is mounted to the face plate, the desired amount of turns is programmed into a digital counter that receives a signal from an opto switch and encoder disk attached to the lathe spindle. The motor speed is manually controlled by a user-adjustable potentiometer. There is also a stand alone tachometer that gives speed feedback to the user. Once the counter reaches the pre-programmed limit, it trips a relay that cuts power to the motor. This way the amount of windings can be precisely controlled. There is even a switch that changes the motor direction for reverse winding humbuckers without the need to remove and flip over the pickup.

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