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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 expected frequency is around 70 kHz with just the fixed capacitor. When you put in the variable capacitor, the frequency reading should change as you change the capacitance (see the video below). The output on the oscilloscope should be a square wave.
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.
Specifically, we leverage the fact that in the frequency ranges from 100 kHz to 40 MHz the electric field around the body behaves as a quasi-static near-field [36,3].
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.
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.
