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29 Δεκ 2004 · The theremin is played by carefully moving your hands near 2 antennas, one for volume and one for pitch. But how does it work? If you mix the signals of 2 rf oscillators, you will get many output signals. The most important signals are the sum and difference of both frequencies.
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The Theremin has two very high frequency oscillators (around 350 kHz). One of them is fixed, and the other is varied by the capacitance of your hand: it's the difference between the two frequencies which decides the pitch.
The oscilloscope can be connected between C2 and the input to 1C as shown in the image below. The output should be a square wave with a frequency of between 60-75 kHz. The frequency can be set by RV1 during tuning.
27 Ιουν 2024 · The complete JFET-based theremin circuit includes a second oscillator, a mixer, and a circuit for the volume antenna. The second oscillator is stabilized at 470 kHz by a ceramic resonator, and so it must be possible to set the adjustable oscillator to this frequency.
Depending on your hand position and the adjustment of the instrument, the beat frequency can be anywhere from around 65 Hz to about 3 kHz (260 kHz minus 257 kHz). These are audio frequencies, and they correspond to a range that spans from about two octaves below middle C to about three-and-a-half octaves above middle C.
The theremin's sound is produced by the electronic principle of 'heterodyning' - when the frequency of the 'pitch' oscillator is subtracted from the frequency of a fixed oscillator, the resultant frequency produced falls within the range of human hearing, and this is what we hear through a speaker as sound.
The theremin, patented in 1928 by L`eon Theremin, is a musical instrument played without any contact from the musician. The theremin uses the heterodyne technique to generate an audio signal. Two oscillators, one connected to an antenna, operate at nominally the same frequency.
