For my Electronic Product Design course at NYU, I built a digital synthesizer. I used a Teensy, Arduino, and the Teensy Audio Library to program everything. It has 13 keys spanning an octave, an envelope, a ring modulator effect, octave up and down buttons, and an arpeggiator effect. It has a built in speaker and an ⅛" out. It can also be used as a midi controller. I designed the printed circuit board in KiCad and the laser-cut acrylic enclosure in Adobe Illustrator.
I also work in the assembly team at Death By Audio, where I build, solder, and test various effects pedals. I also do quality control and assist my boss in various backend operations.