doepfer-a-110-2

Doepfer A-110-2 Basic VCO

Compact analog VCO with linear FM, dual sync, and PWM

8 HP Eurorack module

The Doepfer A-110-2 Basic VCO is an 8 HP analog oscillator built around a sawtooth core. It provides sawtooth, pulse, and triangle outputs, calibrated 1V/octave pitch control, exponential and linear FM inputs, hard and soft synchronization, and voltage-controlled pulse width. A three-position octave switch selects the base register, while a rear jumper chooses the Tune knob's overall span.

Features

  • Analog sawtooth-core oscillator
  • Three simultaneous waveforms: sawtooth, variable-width pulse, and triangle
  • Calibrated 1V/octave pitch input
  • Separate exponential and linear FM inputs
  • Hard-sync and soft-sync inputs
  • Manual and voltage-controlled pulse width
  • Three-position octave switch
  • Rear jumper selects wide or fine Tune range
  • 8 HP Eurorack format

Controls & Jacks (15)

  • PWM— Attenuates the PWM input before it modulates pulse width.
  • Tune— Sets the oscillator frequency within the range selected by the rear tune-range jumper.
  • PW— Sets the base pulse width of the pulse waveform.
  • XFM— Attenuates the exponential FM input before it is summed into oscillator pitch.
  • Linear FM In— Linear frequency-modulation input for changing frequency without exponential pitch scaling.
  • 1V/Oct In— Calibrated exponential pitch input following the 1 volt per octave standard.
  • Exponential FM In— Exponential frequency-modulation input whose depth is set by the XFM knob.
  • Soft Sync In— Soft-sync input that pulls the oscillator into synchronization while retaining a gentler waveform transition.
  • Hard Sync In— Hard-sync input that resets the oscillator cycle from an external oscillator waveform.
  • Sawtooth Out— Sawtooth waveform output from the oscillator core.
  • Range— Three-position octave switch selecting -1, 0, or +1 octave around the base register.
  • PWM In— Pulse-width modulation input whose depth is set by the PWM knob.
  • Pulse Out— Pulse waveform output shaped by PW and the PWM modulation path.
  • Triangle Out— Triangle waveform output derived from the sawtooth oscillator core.
  • Sine output— Sine wave output, pure fundamental without harmonics.

How-To Guides

  • Basic Oscillator Voice
  • Classic PWM
  • Hard-Sync Sweep
  • Soft-Sync Texture
  • Exponential Vibrato
  • Linear FM

Explore the interactive A-110-2 Basic VCO panel on BleepDex — tap any control to learn what it does.

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