Doepfer A-111-1 High End VCO User Manual

doepferSystem A - 100VCO 2 A-11111. IntroductionModule A-111 (VCO 2) is a voltage controlled oscil-lator.The VCO has a range of about 12 octaves, a

A-111 VCO 2System A - 100doepfer10Soft SyncIn contrast with hard sync, soft sync produces nochange in the waveform of the slave VCO. Themaster VCO s

doepferSystem A - 100VCO 2 A-111114. Controls1 RangeFootage (the octave of the fundamental) is controlledwith this knob. Seven settings are availab

A-111 VCO 2System A - 100doepfer125. In- / Outputs! CV 1 • " CV 2Sockets ! and " are the voltage control inputs forcontrolling

doepferSystem A - 100VCO 2 A-11113$ H-Sync • % S-SyncSockets $ and % are the synchronisation inputs.Socket $ is for hard sync, and socket

A-111 VCO 2System A - 100doepfer147. AppendixThe diagram on the right shows the layout of the A-111main circuit board.If you want to disconnect the

A-111 VCO 2System A - 100doepfer22. VCO 2 - OverviewControls:1 Range : 7-position switch for octave selection2 Tune : Control for coarse tuning3

doepferSystem A - 100VCO 2 A-11133. Basics3.1 WaveformsModule A-111 puts out four waveforms simulta-neously. All these signals have the same pitch

A-111 VCO 2System A - 100doepfer4Fig. 3: Harmonic spectrum of a true square waveThe further the pulse width deviates from 50% (seeFig. 2, b and c),

doepferSystem A - 100VCO 2 A-1115Sine waveSine waves are pure waves: they just contain thefundamental, without any harmonics (see Fig. 5).They are t

A-111 VCO 2System A - 100doepfer6Completely different sounds will emerge, though, if themodulation frequency is in the audio range.Exponential FM i

doepferSystem A - 100VCO 2 A-1117Fig. 8: Exponential FM in the audio rangeWhenever you change pitch using exponential FM, theinevitable side effect

A-111 VCO 2System A - 100doepfer8Fig. 9: fM = fCFig. 10: fM = 2 x fCIf you choose non-related frequencies for the carrierand modulator, you can p

doepferSystem A - 100VCO 2 A-1119If it’s the other way round, and the slave is at a higherfrequency than the master (fM < fS) then it still follo