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Analogue Theremin, University of Glasgow

Lindsay Reid and Brendan



For this analogue theremin they used a transistor oscillator which follows a design originally developed by Colpitts. There are four oscillators in total, arranged in two pairs. Each pair forms a beat-frequency oscillator the outputs of which are modulated by the effect of a player's hand capacitance near each antenna. This is how the pitch and volume of the instrument are controlled.



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We have constructed two Theremins, one based on an analog circuit and the other employing digital techniques. Photographs of our completed instruments are shown above. The visual appearance of the analog and digital versions contrast sharply, which was deliberate, in order to reflect the different design approaches used in the digital device and the more 'traditional' analog instrument.