Doepfer A-111-2 High End VCO II/LFO

Here are the most important features of the planned module:

• triangle core
• min. 15 octaves pitch range (typ. 0.5Hz - 20kHz)
• perfect 1V/octave tracking over min. 10 octaves (typ. 20Hz - 20kHz)
• exponential frequency controls and inputs:
  • Tune (~ 1 octave range)
  • Fine (~ 1 semitone range)
  • Octave (range switch with 6 positions)
  • 1V/octave CV input
  • XFM input with attenuator
  • access to bus CV (via jumper, optional)
• linear frequency controls and inputs:
  • LF (manual linear frequency control: fully CW = standard setting for usual VCO applications, fully CCW: close to 0Hz frequency)
    works also as a kind of range control for the exponential section
  • LFM input with attenuator, DC coupled
• Pulsewidth controls and inputs (for rectangle output):
  • PW (manual pulsewidth control from 0%/output = fixed at "low" state up to 100% / output fixed at "high" state)
  • PWM input with attenuator
• Hard Sync input
• Soft Sync input
• Waveform outputs:
  • Sawtooth
  • Rectangle (controlled from pulsewidth section)
  • Triangle
  • Sine
• dual color LED display (to display low frequencies below ~ 25 Hz)
• Nearly "perfect" waveforms (no glitches)
• high end triangle to sine converter with excellent sine waveshape (thank's to Tim Stinchcombe who recommended this circuit)
• the micro precision VCO A-111-3 uses the same VCO core as the A-111-2, but has less inputs, outputs and controls
• Modification final version: additional range switch (between Octave and Tune) to select VCO/LFO mode (see lower picture)

This is a preliminary information about the planned module. The features are still subject to change and all specifications are still preliminary without any obligation !

Breite/Width: 14TE / 14HP / 70.8 mm
Tiefe/Depth: ? mm (gemessen ab der Rückseite der Frontplatte / measured from the rear side of the front panel)
Strombedarf/Current: ? mA