The Open.Theremin.UP is a more complex theremin using a micro controller. Two Open.Theremin.RC or LC circuits can be connected to board. The signal is captured by the micro controller that can apply filters, linearize the input signal and synthesize a nice sinusoidal output sound. The Open.Theremin.UP also features a volume control antenna.

The Open.Theremin.UP is a modular system,  so you can first build the simple Open.Theremin.LC and then improve it by building the up controller board.

The Open.Theremin.UP is not developped and produced anymore. For a new and much improved circuit see the Open.Theremin V3 - Next Generation Theremin.





System Overview

The Open.Theremin is a modular theremin system. There are three modules, the Open.Theremin.RC, the Open.Theremin.LC and the Open.Theremin.UP. The modules RC and LC are discrete, digital theremin circuits. The two modules are very similar. The RC module uses a resistor-capacitor resonator for the hand sensitive resonator. The LC module uses a coil-capacitor resonator. Both modules can be used and tested as simple standalone (pitch only) theremins.

Open.Theremin.LC |  SchematicAssembly |  PCBParts List

The Open.Theremin.UP module consists of a micro-controller, interface and supply circuits. It can be combined with either one or two LC or RC modules to form a much more performant and versatile theremin with pitch and volume control as well as improved antenna characteristics. In the micro-controller the antenna signals of the two connected theremin modules can be read and process independently to implement advanced features like curve correction, digital filtering, control voltage output and waveform generation.

Open.Theremin.UP SchematicAssemblySoftwarePCB | Parts List


Open.Theremin.UP. Old files (V1_1) are available here: Schematic V1_1, PartList V1_1