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Model 212 Dodecamodule

The Dodecamodule Model 212 allows even the smallest Electric Music Box system to incorporate the sophistication and diversity of function formerly available only in large studio systems.

Model 212 integrates the following 12 functions into one compact module:

  • Preamplifier – A low-noise preamplifier for amplifying signals from microphones and instrument pickups. Gain is 35 dB; input impedance is 1 mega-ohm; connector is standard phone.
  • Noise source – A source of unpitched noise with high (+3 dB/octave) and low (-3 dB/octave) spectral distributions.
  • Envelope detector – Generates a control voltage proportional to applied signal amplitude. Output pulse and indicator are activated when input signal level exceeds 0 dB.
  • Stored random voltage – A source of unpredictable control voltage that changes when a pulse is applied. Probability distribution (over control voltage range) is flat; correlation is zero.
  • Random voltage source – A source of continuously changing random voltage with a modified Gaussian probability distribution and voltage-controlled spectral bandwidth (probable rate of change).
  • Balanced modulator – Voltage-controlled, balanced modulator enables continuous transition from unmodified to amplitude-modulated and ring-modulated signals. Unit features exceptionally low distortion (.5%) and high carrier rejection (65 dB).
  • Voltage-controlled filter – A voltage controlled bandpass filter with processing inputs for both center frequency and bandwidth. Center frequency range is from 30 Hz to 15 kHz; bandwidth range is from 1 semitone to 4 octaves. Unit has modulation input, resonance control, exceptionally low noise and high dynamic range.
  • Mixer – A nice, simple 3-input mixer.
  • Headset driver – Five-watt stereo amplifier for driving headsets or low-level monitor speakers
  • Triple envelope generator – Three pulse-activated envelope generators with variable attack and decay times and a choice of sustained or transient operation. Pulse outputs permit cascade or feedback modes. Range of attack and decay times is from .001 to 10 seconds.
  • Triple lopass gate – Three voltage-controlled gates with selectable amplitude-dependent spectral characteristics.
  • Output amplifier – Stereo output section for final mixing and line driving. There are 3 inputs, each with gain, stereo location, and reverberation controls. One each of these parameters is voltage-controlled for enhance flexibility.

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