Step 2: Enclosure
I decided to laser cut a custom enclosure for my project. I designed the enclosure using AutoCAD, Autodesk 123D Make, and Corel Draw, and I've included corel draw and adobe illustrator 2D files as well as the STL, and DWG files from this process below. If you do not have access to a laser cutter, you can use my 2D files a guide and drill the necessary holes in a project enclosure of some kind. Figure 4 shows the holes that should be drilled on the front panel:
(3x) 7mm holes for gain, freq, and PWM pots
(3x) 7mm holes for four push buttons- sin, saw, tri, and pulse
(1x) 10mm hole for audio out
I cut out shapes of all four waveforms in the front of the enclosure so that I could backlight them with indicator LEDs, you may choose to just drill four 5mm holes for these LEDs in the front panel of the enclosure, place one LED under each momentary switch.
Also include a rectangular (11mm tall, 12mm wide) cutout somewhere on the side of the enclosure for the arduino's usb port.
I made my project enclosure out of wood, so I had to glue all the pieces (except the bottom) together with wood glue. I will attach the bottom panel on later in this instructable.