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Doepfer A-111-3 V2 Micro Precision VCO/LFO

Module A-111-3 is an extremely space-saving precision VCO/LFO with a 4HP panel only. Essentially it's the same basic circuit as the A-111-2 but with reduced features:
  • triangle core
  • fully analog design
  • min. 15 octaves pitch range in each mode (VCO/LFO):
    • VCO mode: typ. 0.5 Hz - 20 kHz  (with appropriate external CV)
    • LFO mode: typ. 0.001 Hz - 40 Hz (with appropriate external CV)
  • about 24 octaves total in both modes (typ. 0.001 Hz - 20kHz)
  • perfect 1V/octave tracking over min. 10 octaves (typ. 16Hz - 16kHz in VCO mode)
  • exponential frequency section:
    • Tune control
      • selectable tune control range by means of an internal jumper: about  0.5 / 2 / 10 octaves
      • manual VCO tune range (with jumper pos. 1, without external CV): about 16 Hz- 20kHz
      • manual VCO tune range (with jumper pos. 2, without external CV): about 16 Hz- 70Hz
      • manual VCO tune range (without jumper, without external CV): about 16 Hz- 22Hz
      • the corresponding frequencies in LFO mode are about 1/500 lower, the max. frequency in LFO mode is about 40Hz
    • 1V/octave CV input "1V"
    • exponential frequency modulation XM input with attenuator
    • the XM input socket is normalled to a small positive voltage so that the XM control works as fine tune control when exponential FM is not in use. As a logarithmic potentiometer for finer resolution in the lower range is used, also the fine control is exponential  
      (thank's to Václav of Bastl Instruments for this tip at Superbooth in Berlin)
    • access to internal bus CV (via jumper, optional)
  • linear frequency section:
    • linear frequency modulation input LM (without attenuator), DC coupled
  • Pulsewidth section for rectangle output:
    • Manual pulsewidth control PW, adjusts pulsewidth from 0% (output = fixed at "low" state) up to 100% (output fixed at "high" state)
    • Pulsewidth modulation input PM (without attenuator), about 5Vpp required for full PW range
  • Sync input SY (selectable hard or soft sync via internal jumper)
  • Waveform outputs:
    • Sawtooth, rising edge, output level ~ 10Vpp (voltage range 0 ... +10V)
    • Rectangle (controlled from pulsewidth section), output level ~ 10Vpp (voltage range 0 ... +10V)
    • Triangle, output level ~ 10Vpp (voltage range -5V ... +5V, DC offset can be adjusted also also to 0 ... +10V)
  • Nearly "perfect" waveforms (no glitches)
  • only 4HP panel
  • Modification final version:
  • additional range switch so that the module can be used as VCO or LFO (in LFO mode all frequencies about 1/500 compared to VCO mode)
  • LED (for display in LFO mode)
  • smaller distance between the knobs and smaller knobs (because of the required space for the additional range switch)

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: 4TE / 4HP / 20.0 mm
Tiefe/Depth: 65 mm (gemessen ab der Rückseite der Frontplatte / measured from the rear side of the front panel)
Strombedarf/Current: +40mA (+12V) / -40mA (-12V)