This was a lot of fun to make! I’d wanted to make a “real” capacitive theremin for a while, but I didn’t know what I was going to use for an antenna. I found a schematic for a pitch-only theremin, and decided to try and make it with what I had lying around.
For the antenna, I used a bicycle wheel, which allows for many different approaches for manipulating the pitch. There is a small hole in the wall of the wheel where a wire is soldered, which connects the wheel to the circuit board.
The control box has two knobs: “Calibration” and “Volume”, and an On/Off toggle switch. The control box is actually mounted directly to the door of the theremin.
The name was inspired by Jen Nugent, an artist and friend who lived in my neighborhood while I was building this theremin.
Schematic from: Beavis Audio Research
The theremin is powered by a 9V battery, and uses a standard 1/4″ phono output located on the back of the enclosure to hook up to an amp, effects, etc. All of the wiring and circuitry are housed in a breadbox.