Es una caja con dos antenas, una de las cuales controla el tono del instrumento y la otra el volumen. Oscilador para control de tono. Oscilador para control de volumen. Circuito de resonancia para amplificador controlado por volumen y voltaje.
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Classifieds The RCA Theremin The RCA Theremin holds a place in history as the first manufactured electronic musical instrument, and is credited with laying the foundation for all electronic music to come. Further distinguishing the theremin from the traditional world of mechanical musical instruments reeds, woodwinds, horns, strings, percussion, etc.
To quote period advertising literature from RCA: Simple and graceful movements of the hands produce and control the tone. Petersburg, Russia, August , died Moscow, November Theremin demonstrated his first working model of the instrument that bears his name in as the Etherphone, soon to be known as the Termenvox, or literally, Voice of Termen.
When properly adjusted and voiced, the RCA Theremin has a pitch range of 3. Quoting Dr. The theremin remained a laboratory curiosity from its inception until March when Theremin performed on the instrument for Lenin.
The following December saw the beginning of several years of touring with the instrument in increasingly wider circles throughout Europe.
Theremin then trained a small group of musicians in the art of playing them. Perhaps the most significant miscalculation on the part of RCA was the perception that the theremin was easy to play. Anyone who can carry a tune can play the Theremin!
In reality, while anyone who moves their hands near the antennas of a theremin can cause it to alter its sounds, relatively few people possess the innate musicality required to play the instrument on pitch, let alone with nuance of expression. For melodic playing, a good sense of relative pitch is a prerequisite, and as with any other instrument, practice is essential to a pleasing technique. RCA ceased production of the theremin after a very limited pilot production run of only instruments in total, making them among the rarest manufactured electronic devices of any kind.
To put this in perspective, in , the year after the last documented sale of a new RCA Theremin, RCA as just one of many manufacturers produced 9, radios per day.
Currently, only RCA Theremins are known to survive. How It Works A non-technical explanation of the principle of operation is necessarily a simplification. To put it succinctly, a low-level electromagnetic field is generated within the circuits of the instrument. This field, which extends to an active distance of a few feet, emanates from the two antennas; the vertical pitch control rod on the top of the cabinet, and the horizontal volume control loop on the side.
The electromagnetic fields are relatively weak; a tiny fraction of a mobile phone in use. Both are set at approximately kilohertz which is in the radio frequency, or RF range. This is well below the AM radio band, but still about ten times beyond human hearing. The like frequencies of the two pitch oscillators cancel each other out, leaving just the difference frequency which is well within the range of human hearing.
By the end of , it had been heard on programs of the New York, Cleveland and Philadelphia symphony orchestras and a number of composers of prominence had written especially for the theremin.
Also that year, a performance of ten theremins was demonstrated at Carnegie Hall as part of an avant-garde multimedia production. In the mid s, Hollywood composers discovered the theremin and began to arrange scores that included its haunting sounds to convey disturbed states of mind or establish suspense.
By the early s, the sound of the theremin began to appear in science fiction films, most notably The Day the Earth Stood Still By the s, theremin sounds began to be heard in experimental and rock music. A popular misconception is that the Beach Boys used a theremin in their studio release of Good Vibrations.
In reality, the eerie sound was produced by an electro-theremin or Tannerin, the creation of session musician Paul Tanner. The sound is nearly the same, but the electro-theremin is a contact instrument. More recently, Yoko Ono has employed theremin, played by Pamelia Kursten.
COSTRUIRE THEREMIN PDF
The pitch of a theremin is controlled by creating a circuit between a variable oscillator and a reference oscillator, which should be available at specialty electronics stores as individual units. Each should be tuned to the same frequency, ideally in the middle of the low frequency radio range. The pitch-reference oscillator should work around kHz, used in conjunction with a 10k potentiometer. The signal this oscillator creates should be fed into the mixer with screened cable. The pitch-variable oscillator should also work around khz, and will be affected by the stray capacitance of the reference unit.
I tried a huge iron nail and later a small plate made of several sheets of aluminum. My hand would serve as the other part of the capacitor, also being connected to me, and therefor the ground. This is the circuit used: The capacitor is not connected to the 0V of the battery because the idea was that via your hand would also be the earth, this however did not work, even when putting out my shoes. Therefor I had to hold the 0V with my other hand. Also strangely enough only a sound was created if I touched the sheet; applying more pressure did lower the frequentie, still I had to touch it. I tried tuning it by using a variable resistor for R2 but no results; I still had to touch it. The weird thing is that this circuit should only create an oscillating signal if a capacitor is present, but by touching both the ground and the sheet your body simply becomes part of the circuit as a resistor, and no other capacitors are present.