Doepfer A-111-3 Micro Precision VCO

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)
• 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)
• 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
• linear frequency section
• Pulsewidth section for rectangle output
• Sync input SY (selectable hard or soft sync via internal jumper, CEM3340 hard sync type)
• Waveform outputs
• Nearly “perfect” waveforms
• LED (for display in LFO mode)
• only 4HP panel