Eterofono or I'm talking about the Theremin, the first electronic musical instrument and not for this less charm or power of those living today, in fact.
Composed of two antennas mounted on the electronics box, which controls the height and width wavelength, the Theremin involved in the 20, the date of its creation by the Russian physicist Lev Termen, a revolution in art and music. The
eterofono, as had been called by the author, had his operation to the physical principle of the beat of the waves. Two oscillators produced two waves at the same frequency inaudible because over 20000Hz. Through the antennas connected to the capacitors of the oscillator, one could vary the frequency of the waves of origin so as to produce the sound at the approach of hand.
The real trouble with this tool, however, the price really was not very accessible, but the introduction of the transistor to replace the valves, the cost has dropped so acceptable.
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