Doepfer Drehbank Midi Control Box (device no longer available) User Manual

Page 35

A P P E N D I X

The jack, through which the control voltage is transmitted, must be configured as
follows:

You can also use a mono jack (pin hot).

In the default settings, the external inputs 1, 2, 3, 4 correspond with the controller
knobs 31, 15, 47, 63 and are set for control voltage mode.

When the supplied control voltage does not cover the complete voltage range from
0...+5V the full Midi data range is not available. In this case the range of the
corresponding control knob may be adjusted by altering the settings for the lower
and upper reference voltage of the ADC (analog digital converter). See

!MAIN

EDITOR Window (Edit Control: ADC_REF and ADC_GND)

Foot controller Operation

When a foot controller is connected to the external input it does not supply a
control voltage but represents a variable resistor (voltage divisor or potentiometer).
The Drehbank sends a fixed control voltage of +5V to the input (connected to the
ring of the ¼" jack), so the potentiometer inside the foot controller can generate a
variable control voltage going back to the Drehbank (connected to the tip of the ¼"
jack, same as in CV mode). The required potentiometer needs to have 3
connections: low position, middle position (wiper), and high position. The
potentiometer in the foot controller should have a total resistance within the range
between 5k...25k. Some foot controllers are fitted with potentiometers that have
only 2 connections, these cannot be used with Drehbank.

When working with a foot controller the stereo jack must be configurated as
follows,

Be careful as to which foot controller you buy, make sure that it is compatible with
the Drehbank. We recommend the Doepfer FP5/DB foot controller (special version
for the Drehbank, the FP5 version used with our keyboards is not compatible as
the jack connection is different !).

Ground (GND)

Jack configuration

for cv mode

Control voltage (CV)

Unused (N.C.)

Low position (GND)

Jack configuration

for fc mode

Middle position (CV)

High position (= +5V)