Etherwave Theremin

The Etherwave Theremin is an analog instrument built around a heterodyning oscillator and a VCA. Hand proximity to the pitch antenna sets the frequency, from roughly 0 Hz to 4.2 kHz, while the volume antenna controls dynamics over a range of more than 70 dB. The circuit follows Bob Moog's classic theremin design, with updated electronics that improve bass response in the lower registers. The pitch range spans five octaves with balanced note spacing.

The cabinet is hand-finished hardwood with two quick-release plated-brass antennas and a detachable mic stand adapter. Front-panel controls adjust timbre and the antenna response, and a calibration access panel on top allows deeper adjustment. A headphone output with its own volume control works together with a Mute button that silences the main output while leaving the headphones active, so tuning and timbre can be set privately.

For connections, the rear panel has a 1/4" audio output, a 1/4" jack for a momentary footswitch that controls Mute, and 3.5mm Pitch CV, Volume CV and Gate CV jacks for patching into analog, modular, semi-modular and Eurorack systems. Power comes from an external wall adapter.