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Theremin

Page history last edited by MrTundraMan 10 years, 10 months ago

Theremin Hardware Design

 

 

Specifications - Gathered from various Internet sources

 

  • Original Theremin 1928 patent  #1658953
  • The pitch of the instrument is controlled by the proximity of the player's hand to an antenna (mounted vertically in the original design). A second antenna (traditionally mounted horizontally) senses the proximity of the player's other hand and controls the volume of the tone.
    The digital Theremin uses CMOS oscillators and logic gates to produce two DC levels. One DC level varies with the proximity of the player's hands from the pitch antenna, and the other DC level varies when the volume antenna is approached. This design of circuit is advantageous because it pretty much depends on the imagination of the constructer, what he/she wants to do with these DC levels. Obviously, a basic instrument would have the DC levels controlling a voltage-controlled oscillator (VCO) and voltage-controlled amplifier (VCA). Glasgow Physics Dept.
  • Five-octave pitch range and reliable spacing between notes for sophisticated playability
    Controls
    /Features
    * POWER rocker switch - switches on and off the AC power to theremin.
    * AUDIO OUT - standard 1/4" phone jack, which delivers line level output to your amplifier.
    * PITCH rotary control, for adjusting the response of the pitch antenna.
    * VOLUME rotary control, for adjusting the response of the volume antenna.
    * WAVEFORM rotary control, for adjusting the waveform of the audio output.
    * BRIGHTNESS rotary control, for adjusting the brightness of the audio output.
    * POWER INPUT - receptacle for the special AC adapter that comes with the Etherwave. 110 volt and 220 volt adapters are available.
    * ANTENNA CONNECTORS - threaded connectors which allow the antennas to be removed for travel.
    Moog Specs for the Etherwave Theremin.
  • On Theremin Tone PAIA page.
  • Closer to vertical antenna is higher in frequency. Further from the vertical antenna is lower in frequency. Volume is zero for the horizontal antenna at the lowest and higher for higher.
  • PySynth
  • Arduino Theremin 
  • Strings
    • f =  1/ (2L) *  sqrt{T/u)
      where T is the tension, u is the linear density, and L is the length of the vibrating part of the string. Therefore:
          the shorter the string, the higher the frequency of the fundamental
          the higher the tension, the higher the frequency of the fundamental
          the lighter the string, the higher the frequency of the fundamental

 

Kits

 

 

Performances

 

 

 

 

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