Doepfer A-151v Bedienungsanleitung


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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
A-110 VCO System A - 100 doepfer
2
2. VCO Overview Controls:
1 Range: 5-position Octave or Footage switch
2 Tune: Fine tuning control
3 CV 2: Attenuator for voltage at CV 2 (!)
4 PW: Manual control for Pulse Width
5 PW CV 2: Attenuator for PWM voltage at PW
CV 2 (")
In / outputs:
! SYNC: Sync input
" CV 1: Voltage control input 1
§ CV 2: Voltage control input 2, level ad-
justable with
$ PW CV 1: PWM input 1
% PW CV 2: PWM input 2, level adjustable with
&: Sawtooth output
/: Square wave output
(: Triangle wave output
): Sine wave output
VCO
CV 1
CV 2
PW CV 1
Tune
CV 2
PW
PW CV 2
Range
SYNC
%
&
!
'
"
+,-.
PW CV 2
0
0 10
010
010
0 10
-2
+2
STANDARD VCO
doepfer System A - 100 VCO A-110
3
3. Basics
Module A-110 puts out four waveforms simultaneously.
All these signals have the same pitch, since all are
controlled by the same voltages present at inputs "
and §.
Sawtooth
The VCO’s sawtooth waveform is present at output &.
It has a ‘cutting’ sound, rich in overtones. All the
harmonics of the fundamental are present, with a linear
reduction in intensity as the harmonic series progres-
ses - so that the second harmonic is half as
Fig. 1: Harmonic spectrum of a sawtooth
strong, the third is one third, the fourth a quarter, and
so on (see Fig. 1).
Sawtooth waves are ideal for synthesizing sounds
which are rich in harmonics, such as percussion, brass
or vocal timbres.
Square wave
The VCO produces a square / rectangle wave at output
/. You can alter its pulse width manually, or by voltage
control (Pulse Width Modulation).
Fig 2: Square waves with different pulse widths
f
1
f
2
f
3
f
4
f
5
f
6
f
7
f
8
f f
9
Harmonics
0%
100%
1/f 1/f
ab
c


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Marke: Doepfer
Kategorie: Nicht kategorisiert
Modell: A-151v

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