Intellijel Rubicon2 Manual

Thru-zero discrete triangle core vco

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Rubicon
Thru-Zero Discrete Triangle Core VCO 
 
Manual Revision: 2018.05.20 
 
 
2
Rubicon
Manual 
 
 

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Summary of Contents for Intellijel Rubicon2

  • Page 1         Rubicon Manual  2  Rubicon Thru-Zero Discrete Triangle Core VCO        Manual Revision: 2018.05.20     ...
  • Page 2: Table Of Contents

         Rubicon Manual           Table of Contents  Table of Contents  Overview  Installation  Before Your Start  Installing Your Module  Front Panel  Panel Overview  Pitch Controls  Wave Type Switches  FM Index Controls  Symmetry Controls  Miscellaneous Controls  Pulse Width Controls  WARP Controls ...
  • Page 3: Overview

         Rubicon Manual           Overview  Rubicon is the second generation of the classic Rubicon triangle core analog VCO, designed in  collaboration with David G. Dixon.  It features nine simultaneously available waveshape outputs; two sub-oscillators; three  variations of a sine wave;...
  • Page 4: Installation

          Installation  Intellijel Eurorack modules are designed to be used with a Eurorack-compatible case and power  supply.  Before Your Start  Before installing a new module in your case you must ensure your case’s power supply has  sufficient available capacity to power the module: ...
  • Page 5 Eurorack case. Ensure the red stripe on the  cable lines up with the -12V pins on the bus  board. On Intellijel power supplies the pins are  labelled with the words “-12V” and a thick white  stripe, as shown in the the photo to the upper ...
  • Page 6: Front Panel

         Rubicon Manual           Front Panel      Page 5 ...
  • Page 7: Panel Overview

         Rubicon Manual           Panel Overview  Rubicon is a deep and flexible analog oscillator, with numerous controls and jacks working in  tandem to alter the pitch, waveform and harmonic spectrum in many unique ways. To  understand all its features and how they affect the sound, it might be easiest to divide the ...
  • Page 8: Pitch Controls

         Rubicon Manual           Pitch Controls    A. VCO/LFO switch - This switch changes whether the Rubicon operates as a low  frequency oscillator (LFO) or as an audio oscillator (VCO). In VCO mode the oscillator  runs at audio rates with frequencies between 8 Hz and 20 kHz (depending on the ...
  • Page 9: Wave Type Switches

         Rubicon Manual           Wave Type Switches    A. SINE TYPE switch - Sets the shape of the waveform appearing at the SINE OUT jack. If  set to the left, the output is a pure SINE wave. If set to the middle, the output is a  SIGMOID.
  • Page 10      Rubicon Manual           pulses are better for syncing, but center pulses are perhaps more sonically ‘pleasing.’  Ultimately, let your ears be the judge.  The following illustration is indicative of how the PULSE TYPE switch affects a narrow  TRI STATE PULSE. ...
  • Page 11: Fm Index Controls

         Rubicon Manual           FM Index Controls    A. INDEX knob - Sets the base FM INDEX level, which is the amount that a signal patched  into the TZFM input will modulate the VCO frequency. At the clockwise position,  frequency modulation is at its maximum.
  • Page 12: Symmetry Controls

         Rubicon Manual           Symmetry Controls    A. SYMMETRY knob  Symmetry sets the bias of the oscillator — the center point around which a signal  patched into the TZFM input varies the output pitch of the oscillator. Basically, when  SYMMETRY is set to either extreme (fully clockwise or fully counterclockwise), ...
  • Page 13      Rubicon Manual           B. SYM attenuator - You can modulate the SYMMETRY value with a control signal  patched into the Rubicon SYM input. The SYM attenuator adjusts the extent to which  that control signal is added to the value set with the SYMMETRY knob.  NOTE: External CV control of SYMMETRY is possible even with the LOCK switch ...
  • Page 14: Miscellaneous Controls

         Rubicon Manual           Miscellaneous Controls    1. EXP FM attenuverter - Sets the attenuation and polarity of the modulator signal patched  into the FM EXP input.  With the knob at noon, no exponential FM occurs. When set clockwise from the noon  position, Rubicon ’s oscillator increases in pitch when it receives positive voltages at the ...
  • Page 15: Pulse Width Controls

         Rubicon Manual           Pulse Width Controls    A. PW knob - Sets the width of the PULSE, TRI STATE PULSE and, by consequence, the  WARP waveforms. At the noon position, both the PULSE and TRI STATE PULSE  waveforms are square. ...
  • Page 16: Warp Controls

         Rubicon Manual           WARP Controls    A. WARP knob - Controls the amount and direction by which a signal plugged into the X IN  jack is warped by the Tri State Pulse. If no signal is plugged into the X IN jack, then the  Sub Oscillator feeds into the Warp circuit by default.
  • Page 17      Rubicon Manual           sonic characteristic of the Squish circuit is variable from “smooth” to “aggressive,” and  can be adjusted to your own personal taste using a trimpot on the back of the Rubicon.  Because the Warp circuit works by summing two different waveforms together, it’s very  likely that an unsquished WARP output will be “hotter”...
  • Page 18: Inputs

         Rubicon Manual           little sonic change between a squished and an unsquished waveform (other than output  level).  Should you find the Squish circuit too tame, turn the trimpot a bit further clockwise. The  more you turn it, the more wavefolding you introduce into the output signal.  It’s up to you how you want SQUISH to sound.
  • Page 19      Rubicon Manual           D. SYM IN - CV input to modulate the SYMMETRY setting for Thru-Zero FM. The extent to  which this input modulates the SYMMETRY amount is governed by the associated mini  SYM attenuator.  E.
  • Page 20      Rubicon Manual           B. TRIANGLE OUT - Outputs a Triangle wave.  C. SAWTOOTH OUT - Outputs a Sawtooth wave.  D. DOUBLE SAWTOOTH OUT - Outputs a Double Sawtooth wave, which is double the  frequency of a standard sawtooth.  E.
  • Page 21: Rubicon 2 School

         Rubicon Manual           Rubicon School  Rubicon is a fully featured and advanced analog oscillator. As such, it might employ concepts  or features with which you’re not overly familiar. Although this section of the manual isn’t  designed to supplant a proper university, technical bookstore or Google search, it might help ...
  • Page 22: Exponential Vs. Linear Fm

         Rubicon Manual           Exponential vs. Linear FM  In general, there are two distinct types of FM, both of which are supported by the Rubicon :  ● EXPONENTIAL FM is the type found in many vintage analog mono synths of the 1970’s.  When you change the frequency of the modulator, you change the perceived ...
  • Page 23: Why Does Pitch/Tracking Change With The Symmetry Setting

         Rubicon Manual           symmetry results in an output with the same pitch and sonic characteristics as a fully positive  symmetry — the only difference is that the oscillator runs ‘backward,’ meaning its phase is  reversed.
  • Page 24: Understanding Warp

         Rubicon Manual           If the Rubicon PULSE TYPE switch is set to the left (center triggered) position, then the  Tri State Pulse results from a comparison of the PULSE and TRI waves.    If the Rubicon PULSE TYPE switch is set to either the middle or right (edge triggered), then the ...
  • Page 25      Rubicon Manual           Sub Oscillator feeds into the Warp circuit by default. The output of the warped signal appears at  the WARP OUT jack.  Because the Warp circuit adds a Tri State Pulse to the X waveform (if the Warp knob is turned  clockwise), or subtracts a Tri State Pulse from the X waveform (if the Warp knob is turned ...
  • Page 26: Understanding Sync

         Rubicon Manual           When the Rubicon SQUISH switch is in the up position, the Squish circuit is engaged, and the  WARP circuit’s peak-to-peak output voltage is wavefolded and reduced to typical 10V p-p levels.  You can alter the sonic characteristic of the Squish circuit by using the trimpot on the back of the ...
  • Page 27: Technical Specifications

         Rubicon Manual           The following illustration shows an example of how the two types of sync can affect the output  waveform:    Technical Specifications    Width  20 hp  Maximum Depth  38 mm  Current Draw  142 mA @ +12V ...

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