Boing Boing pal and maker superhero Mitch Altman, creator of the amazing TV-B-Gone, spent several years designing a simple-yet-powerful DIY music synthesizer that he could use to teach creative electronics and also digital signal processing to kids and adults. The result is the ArduTouch Music Synthesizer! And it's only $30! Demo videos below. Mitch wrote about the method behind his maker madness in IEEE Spectrum. From his essay:
As a kid with a lust for music, I was rocked by the Moog synthesizer sounds of 1968's Switched-On Bach. I needed to learn how to make those sounds! Thus began a lifetime of learning and synthesizer making while I made my way in the tech industry, where I ultimately created the TV-B-Gone, a gadget that lets you turn off almost any model of remote-controlled television. Since the popular success of the TV-B-Gone, I've created many fun, open-source, hackable hardware kits for the maker workshops I give around the world. In these workshops, newbies learn to solder, tinkering their way into electronics and microcontrollers. Remembering my own youth, I wanted to provide them with a kit that was simple to assemble [PDF] and use but still a fully fledged music synthesizer.
The result was the US $30 ArduTouch. This project incorporates, on a single board, a touch keyboard, an ATMega328P (the same processor used in the Arduino Uno), and an audio amp with a speaker. It also has a software library that can serve as an entry point into the world of digital signal processing.
"How TV-B-Gone's Mitch Altman Created the ArduTouch Music Synthesizer" (IEEE Spectrum)
Ardutouch Music Synthesizer Kit (Cornfield Electronics)