Doepfer A-111-5 User Manual
DOEPFER System A-100 Synthesizer Voice A-111-5
1. Introduction
Fig. 1: A-111-5 sketch
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Synthesizer Voice A-111-5 System A-100 DOEPFER
Module A-111-5 is a complete monophonic synthesizer
module that includes these components:
VCO
• manual tune control (with an internal jumper the range
can be set to ~ +/-1 half an octave or ~ +/-2.5 octaves)
• range switch -1 / 0 / +1 octave
• frequency range about 10Hz ... 12kHz
• FM (frequency modulation) control with modulation
source switch (LFO1 / off / ADSR)
• manual pulsewidth control for rectangle waveform
• PWM control with modulation source switch (LFO2 / off
/ ADSR)
• waveform switch (sawtooth / off / triangle)
• the sum of the waveform chosen by this switch and the
rectangle is fed into the VCF (to turn the rectangle off
the PW control has to be set fully CCW)
• external CV input for VCO frequency (1V/octave)
• external CV input for external PWM of the rectangle
• internal CV input for frequency (1V/octave) connected
to the A-100 bus via jumper, the jumper can be used to
interrupt this internal connection if not wanted
VCF
• 24 dB low pass
• ~ 12 octaves frequency range
• manual frequency control
• tracking switch half - off - full (internally connected to
the external frequency CV input of the VCO, i.e. the
VCF tracks to the VCO if the switch is set to "half" or
"full" position)
• XM: exponential FM (frequency modulation) control
with modulation source switch (LFO2 / off / ADSR)
• LM: linear FM (frequency modulation) control to
modulate the VCF by the triangle of the VCO in a linear
(!) manner
• manual resonance control (up to self oscillation)
• external audio input (this signal is added to the VCO
signal)
• external CV input for filter frequency
• 1V/octave tracking for usage of the VCF as a sine
wave oscillator (not as precise as the VCO but much
better than most of the other filters)
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DOEPFER System A-100 Synthesizer Voice A-111-5
VCA
• manual amplitude control
• AM (amplitude modulation) control with modulation
source switch (LFO1 / off / ADSR)
• external CV input for VCA amplitude
• special control scale: exponential scale in the range from
about -20dB to -80/90dB, linear scale from about -20dB
to 0dB
Remark: this special control scale results in a loudness
behaviour that is a bit different from pure linear or
exponential VCAs
LFO1 and LFO2
• manual frequency control
• waveform switch (triangle / off / rectangle)
• range switch (low, audio, medium)
• LED display (dual green/red color for positive/negative
share of the signal)
• the inverted LFO1 signal is available as an additional
socket (to use the LFO1 signal for external modules)
• an internal jumper can be used to select between the
LFO1 signal or the inverted LFO1 signal
ADSR
• manual controls for Attack, Decay, Sustain, Release
• range switch (long, short, medium)
• blue LED display
• ADSR signal is available as an additional socket (to use
the ADSR signal for external modules)
• Gate input connected to the A-100 bus via jumper, the
jumper can be used to interrupt this internal connection if
not wanted
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Synthesizer Voice A-111-5 System A-100 DOEPFER
Remarks:
• As the LFO frequencies can go up to moderate audio
range (~ 5kHz) even audio FM effects of VCO (pitch
and pulsewidth), VCF and ADSR are possible !
• If the VCO is turned off (waveform switch = center
position, pulsewidth control = fully CCW) and the VCF
resonance is set to maximum the module can be used
as a sine oscillator. The sine can be modulated in a
linear manner from the triangle wave of the VCO and
by LFO2 in an exponential manner at the same time !
• from the factory the socket labelled "LFO1" outputs the
inverted LFO1 signal. But as the module has several
internal pin headers available even another signal may
appear at this socket by changing the internal module
patch. These six pin headers are available: LFO1
output, LFO2 output, ADSR output, inverter input,
inverter output, output socket. The internal default
patch is LFO1 -> inverter input, inverter output ->
output socket (i.e. socket = inverted LFO1). But even
another signal can be patched to this socket (e.g.
inverted ADSR, non-inverted LFO1, inverted or noninverted LFO2). It is also possible to add a blind panel
next to the A-111-5 with a couple of sockets that are
connected to the corresponding pins of the A-111-5 pc
board. The in- and outputs of the VCO, VCF and VCA
are not available as pin headers because the VCO,
VCF and VCA are internally connected in the circuit
which is used in this module.
Additional specifications:
• Front panel width: 24 HP / 121.6 mm
• Module depth: 40 mm (measured from the rear side of
the front panel)
• Current: 80 mA
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DOEPFER System A-100 Synthesizer Voice A-111-5
2. Overview
Fig. 2:
Front Panel
(full view)
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Synthesizer Voice A-111-5 System A-100 DOEPFER
1
2
3b
3a
5
4
6b
10
11
Fig. 2a: Front Panel
(VCO and VCF)
7
1 VCO Tune
8
2 VCO Range Switch (Octave Switch)
3a VCO FM Source Switch
3b VCO FM Level
9b
4 VCO Waveshape Switch
5 VCO Rectangle Pulsewidth
6a VCO Pulsewidth Modulation Source
9a
6b VCO Pulsewidth Modulation Level
7 VCF Frequency
8 VCF Tracking Switch
9a VCF exponential FM Source Switch
9b VCF exponential FM Level
10 VCF linear FM Level
11 VCF Resonance
6a
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DOEPFER System A-100 Synthesizer Voice A-111-5
Fig. 2b: Front Panel
(VCA, LFO, ADSR)
12
16
13b
13a
14a
14b
14c
15a
17
18
19
12 VCA Amplitude (Manual Gain)
13a VCA AM Source Switch
13b VCA AM Level
14a LFO1 Frequency
14b LFO1 Frequency Range Switch
14c LFO1 Waveform Switch
15a LFO2 Frequency
15b LFO2 Frequency Range Switch
15c LFO2 Waveform Switch
16 ADSR Range Switch
17 ADSR Attack Time
18 ADSR Decay Time
19 ADSR Sustain Level
20 ADSR Release Time
15b
20
15c
7
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