Key Features
- Fully analog design for great sounds
- VCO tune range can be adjusted to a high level of precision
- Exponential and linear FM for tonal shaping
- LFO switch for using the module as a modulation source
Doepfer A-111-2 High End VCO II Overview
The Doepfer A-111-2 High End VCO II is a fully analog VCO that has many tone-shaping features and possibilities for modulation. This VCO is based on a triangle core and achieves all other waveforms from the triangle using waveshapers. This makes for nearly perfect waveforms. The waveforms this can output are sawtooth, rectangle, triangle and sine waves. The oscillator can also track pitch at 1V/Oct and can also be coarsely and fine adjusted.
The A-111-2 features a range of inputs and control options with exponential and linear frequency modulation and pulse width modulation. All these include attenuators so the input voltage can be adjusted to different levels. This module features the same basic circuitry but has more inputs, outputs and controls than the smaller A-111-3 and A-111-3v modules.
Product Ref: 220489
Full Description
View Full DescriptionAnalog oscillator
The A-111-2 has a fully analog triangle core circuit. It can be used in VCO mode for audio signals and LFO mode for modulation. The rates of each mode are:
- VCO mode: 0.5 Hz - 20 kHz (with appropriate external CV)
- LFO mode: 0.001 Hz - 40 Hz (with appropriate external CV)
These modes can be switched between using the switch on the front panel. The LFO mode's frequencies are about 1/500 of the VCO's. The oscillator can pitch track at 1V/Oct for 10 octaves. The available outputs are sine, sawtooth, rectangle (controllable with PW) and triangle. The tune knob allows for coarse adjustments of the pitch of around an octave, with a jumper this can be increased to 3 octaves. There is an octave switch to change between a 6-octave range. A fine-tuning knob also allows precise tuning adjustments of +/- 1 semitone.
Modulation
There are 3 ways to modulate this oscillator. There are exponential and linear frequency modulations and for the rectangular waveform, the pulse width can also be modulated. There is an exponential frequency modulation input with an attenuator on the front marked XFM. The linear frequency modulation has a control knob (LF) and a control input marked LFM, this also has an attenuator (also marked LFM). This is DC coupled so audio rate signals can be patched in as well.
The pulse width can be manually adjusted using the PW knob from 0 percent (constantly at low) to 100 percent (constantly at high). The pulse width can also be modulated with the PM input and the control voltage can be attenuated (PWM). There are hard and soft sync inputs for synchronising with other control voltages.
Specifications
- Size: 14HP / 70.8mm
- Depth: 55mm (measured from the rear side of the front panel)
- Current:
- +12v: +70mA
- -12V: -50mA
- Product code: A-111-2
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