This theramin project uses readily available components and the circuit is based around only two transistors, a capacitor, and a photo-resistor. The cases were built from old alarm clocks and the photo sensor and existing snooze button are used for triggering the circuit. Check out the parts list and how-to instructions at the link below.
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Okay, first off it’s “theremin”, with two E’s. The link website spells it correctly, even!
Second, that’s not a theremin, it’s a light-dependent oscillator – aka ‘Optomin’. Just because a circuit changes the frequency of an oscillator, doesn’t make it a theremin – not even if you wave your hand near it to change the note.