Doepfer A-198 Trautonium / Ribbon Controller - Manual

doepfer System A - 100 Trautonium / Ribbon Controller A-198
1
1. Introduction
Module A-198 is a so-called Trautonium resp. Rib-
bon Controller. It provides variable Control Voltages
and Gate signals generated by combined position /
pressure sensor. The controlling element of the A-
198 is a linear position sensor (length about 50 cm)
that has available a pressure sensor too.
Touching the sensor with a finger generates a Con-
trol Voltage that is proportional to the position of
the finger. The Scale - i.e. the relation between
position difference and voltage difference - is ad-
justable with a potentiometer at the front panel. A
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 Gate signal is
derived from the CV voltage whenever a finger tou-
ches the sensor (e.g. for triggering an Envelope Gene-
rator / ADSR).
A pressure sensor made of conductive rubber arran-
ged below the position sensor generates a second
Control Voltage that increases with higher pressure
of the finger. Even for this CV the Scale is adjustable.
A second Gate signal is triggered as soon as the
pressure exceeds a certain value. The Gate Thres-
hold is adjustable at the front panel.
A-198
Trautonium / Ribbon Ctr.
Scale CV
Gate
Position
Scale CV
Gate
Pressure
Control
Board
Off
On Hold
Thres