The Open Theremin is an open source hardware and software project, with the aim is of building a next-generation, DIY theremin.
Two Open Theremin designs are available:
- The Open.Theremin.UNO is a full Arduino-based theremin that offers both audio and control voltage outputs.
- The Open.Theremin.RC is a more basic one-antenna (pitch) design.
The project is documented under a creative commons license.
- Pitch and volume antenna with excellent linearity and digital tuning
- Arduino compatible shield for easy programming
- 12bit digital to analog converter generates audio out signal
- Waveform can be reprogrammed freely (stored in a look-up table)
- Audio plug can be reprogrammed to provide Control Voltage (CV)
- Connector for audio or control voltage on board
- USB powered, no extra power supply required
- Can be powered by battery
- Low profile SMD design for simple shipment
- Pads to screw or solder on antennas or antenna cable
- One button interface
- Distance of hand to antenna is converted to a digital value that can be used for other applications than theremins
- Pads to connect analog potentiometer (or digital encoder)
- Pads to connect grounding directly to board
Here’s a video of the Open.Theremin.Uno in action:
Here’s an example of a DIY Matryomin Matryoshka Doll Theremin, based on the Open Theremin:
The Open.Theremin.RC is a simple and basic theremin circuit with one pitch antenna.
The circuit will run on a 9V battery and produce a triangular output signal. The circuit is good to explore the basic theremin principle of heterodyne oscillators.
Kits for both theremin projects are available via the Open Theremin site.