A-111-3 Micro Precision VCO / VCLFO


The Doepfer A-111-3 Micro Precision VCO is a 100% analog triangle-core VCO based on the A-111-2 Precision VCO but in a mere 4HP. The module features precision rectangle, sawtooth, and triangle waveforms and boasts a generous frequency range from 0.001Hz to 20kHz. Additionally, the module tracks at an impressive 15 octaves and features a switch that toggles between LFO and VCO modes. There are both exponential modulation and frequency modulation inputs, plus an additional PWM input with dedicated adjustment knob.

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exponential frequency section:

Tune control (~ 0.5 or ~ 2 or ~ 10 octaves range, selectable via internal jumper)

1V/octave CV input

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

(thank's to Václav of Bastl Instruments for this tip at Superbooth in Berlin)

access to bus CV (via jumper, optional)

linear frequency section:

LM input (without attenuator), DC coupled

Pulsewidth section for rectangle output:

PW (manual pulsewidth control from 0%/output = fixed at "low" state up to 100% / output fixed at "high" state)

PWM input (without attenuator), about 5Vpp for full PW range

Sync input (selectable hard or soft sync via internal jumper)

Waveform outputs:

Sawtooth, output level ~ 8Vpp

Rectangle (controlled from pulsewidth section), output level ~ 8Vpp

Triangle, output level ~ 8Vpp

Nearly "perfect" waveforms (no glitches)

only 4HP panel

Modifications version (prototype 2):

Range switch so that the module can be used as VCO or LFO (in LFO mode all frequencies about 1/100 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)


Data sheet


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