Doepfer A-110 Standard VCO User Manual

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doepfer
System A - 100
VCO
A-110
1
1. Introduction
Module A-110 (VCO) is a voltage-controlled oscilla-
tor.
This VCO’s frequency range is about ten octaves. It
can produce four waveforms simultaneously: square,
sawtooth, triangle, and sine wave.
The Frequency or pitch of the VCO is determined by
the position of the octave (Range) switch and tuning
(Tune) knob, and by the voltage present at the CV
inputs. Frequency modulation (FM) of the VCO is
therefore a possibility. Footage (the octave of the
fundamental) is set by the Range control, and Fine
tuning controlled by the Tune knob.
You can control the pulse width of the square wave
either by hand, or by voltage control - Pulse Width
Modulation or PWM.
H
Because of the analog nature of the design,
the VCO may need about 20 minutes’ warm-
up time for the tuning to become completely
stable.
SYNC
CV 2
CV 2
PW CV 1
PW CV 2
PW CV 2
PW
CV 1
Range
A-110
VCO
Tune
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Summary of Contents

Page 1 - 1. Introduction

doepferSystem A - 100VCO A-11011. IntroductionModule A-110 (VCO) is a voltage-controlled oscilla-tor.This VCO’s frequency range is about ten octave

Page 2 - 2. VCO Overview

A-110 VCOSystem A - 100doepfer10Fig. 9: exponential FM using the A-110With FM in the audio range, the ear doesn’t resolvethese octave transitions,

Page 3 - 3. Basics

doepferSystem A - 100VCO A-11011Pulse Width ModulationIf you modulate the pulse width of a square wave withan LFO or ADSR (Pulse Width Modulation, o

Page 4 - Triangle wave

A-110 VCOSystem A - 100doepfer127. Patch-SheetThe following diagrams of the module can help yourecall your own Patches. They’re designed so thata c

Page 5 - Frequency Modulation (FM)

A-110 VCOSystem A - 100doepfer22. VCO OverviewControls:1 Range: 5-position Octave or Footage switch2 Tune: Fine tuning control3 CV 2: Attenuator

Page 6 - 4. Controls

doepferSystem A - 100VCO A-11033. BasicsModule A-110 puts out four waveforms simultaneously.All these signals have the same pitch, since all arecon

Page 7

A-110 VCOSystem A - 100doepfer4A symmetrical Pulse wave (i.e. an exact squarewave, with a pulse width of 50 %), has only oddharmonics of its fundam

Page 8

doepferSystem A - 100VCO A-1105Sine WaveSine waves are pure waves: they just contain thefundamental, without any harmonics (see Fig. 5). Theyare th

Page 9 - FM in the audio range

A-110 VCOSystem A - 100doepfer64. Controls1 RangeFootage (the octave of the fundamental) is controlledwith this knob. Five settings are available,

Page 10

doepferSystem A - 100VCO A-11075. In / Outputs! SYNCSocket ! is the Sync Input for the VCO. What syncmeans in this context is that the waveform of

Page 11 - VCO and WAVEFORM PROCESSOR

A-110 VCOSystem A - 100doepfer8Input " is normally connected to a control voltagegoverning pitch (for instance from a MIDI-CV interface,or a m

Page 12 - VCO

doepferSystem A - 100VCO A-11096. User examplesFM in the audio rangeUsing audio range oscillators for FM can produceinteresting sounds. Thanks to

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