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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Last Modified:2005-03-16 1722 Reads