Doepfer A-198 User Manual
doepfer
A-198
Trautonium / Ribbon Ctr.
Gate
Pos ition
Hold
System A - 100
1. Introduction
Module A-198 is a so-called Trautonium resp. Ribbon Controller. It provides variable Control Voltages
and Gate signals generated by combined
Off
On
pressure sensor. The controlling element of the A198 is a linear position sensor (length about 50 cm)
that has available a pressure sensor too.
Trautonium / Ribbon Controller
A-198
position /
CV
Gate
CV
Control
Board
Scale
Pressure
Thres
Scale
Touching the sensor with a finger generates a Control Voltage
the finger. The Scale - i.e. the relation between
position difference and voltage difference - is adjustable
Hold switch is used to determine if the CV voltage is
held after removing the finger or if the voltage jumps to
0V. In the last case (Hold = off) a
derived from the CV voltage whenever a finger touches the sensor (e.g. for triggering an Envelope Generator / ADSR).
A pressure sensor made of conductive rubber arranged below the position sensor generates a
Control Voltage that increases with higher pressure
of the finger. Even for this CV the Scale is adjustable.
A
second Gate
pressure exceeds a certain value. The Gate Threshold is adjustable at the front panel.
that is
with a potentiometer at the front panel. A
proportional to the position of
signal is
Gate
second
signal is triggered as soon as the
1
A-198
Trautonium / Ribbon Controller
System A - 100
doepfer
2. Overview
3
"
!
5
$
§
2
1
4
6
%
Controls:
1 Scale : Scale / spread control for Position Con-
trol Voltage output
Hold : Hold function switch
2
3 LED : Gate signal indicator for Position Gate at
output " (active only if Hold = off)
Thres : Threshold control for Pressure Gate si-
4
gnal at output
LED : Gate signal indicator for Pressure Gate at
5
output $
6
: Scale / spread control for Pressure Con-
Scale
trol Voltage output
!
$
§
In / Outputs:
: Position Control Voltage output
CV
!
Gate : Position Gate output (active only if Hold =
"
off)
: Pressure Control Voltage output
CV
§
Gate : Pressure Gate output
$
Contr. Board
%
: Connector for manual (USB type)
Do not connect USB devices to this socket!
A
2
doepfer
System A - 100
Trautonium / Ribbon Controller
A-198
3. Controls
1 Scale
The position sensor of the A-198 is in principle a
linear potentiometer that is activated whenever a
finger touches the sensor. Consequently the relation
between the position of the finger and the Control
Voltage CV
CV
is linear
POS
Ribbon Sensor
PO S
Fig. 1: Connection between position, Control Vol-
tage CV
The
, i.e. the connection between position diffe-
Scale
rence and voltage difference, is adjusted with control
1 (see fig. 1).
too (see fig. 1).
and Scale
POS
Scale
Pos it ion
P
If CV
is used to control the VCO pitch
POS
the scale is adjusted with control 1 so that
the position difference corresponds to the
desired spread, e.g. 25 cm for one octave.
2 Hold
This switch determines the behaviour of the position
control voltage CV
the sensor:
Off :CV
drops to 0V and the Gate output "
POS
turns from high to low. This is the same mode
that was available in the Trautonium.
The last control voltage before the finger was
On :
removed is held with an internal S&H circuit.
In this mode the Gate function at output " is
not active (Gate is permanently high). This
mode was not available in the Trautonium.
In the Off position of the Hold switch the control
voltage CV
drops to 0V as soon as the finger is
POS
removed. If the Gate output " is used to trigger an
Envelope Generator (e.g. A-140, A-141), that controls
the loudness of a VCA or the timbre of a VCF, the
Release time of the Envelope Generator should be
set to zero so that the dropping tone is muted. This is
identical to the behaviour of the Trautonium. Even for
if the finger is removed from
POS
3
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