Doepfer A-138 a/b Mixer (linear / logarithimc) - Manual (Page 3)

doepfer System A - 100 MIXER A-138
3
3. Controls and markings
1 lin. / exp.
Check which little circle is filled in, to see which version,
linear or exponential (logarithmic), the VCA is.
2 In 1 ... 5 In 4
Attenuators 1 to 4 control the level for inputs ! to $.
6 Out
The output level of the mixer is controlled by attenua-
tor 5. Unlike on most A-100 modules, the output has an
attenuator, so that it can act as the end of the audio
chain, and interface directly with a mixing desk, ampli-
fier, etc.
From about middle of 2004 the module is equipped with
an additional offset function for input 1. The pin header
labelled JP4 (located behind input 1 on the pc board) is
used for this option. With no jumper on JP4 the offset
option is disabled. If a jumper is put to JP4 in the right
position (near the edge of the pc board) a positive offset
voltage (~ 0...+5V) is generated by control 1 provided
that no plug is inserted into socket 1. If a jumper is put to
JP4 in the left position (direction to the front panel) a
negative offset voltage (~ 0...-5V) is generated.
4. In / Outputs
! Input 1 ... $ Input 4
Sockets ! to $ are the mixer’s inputs. Patch in what
you want to mix via these sockets.
H You can use the mixer for either control volta-
ges or audio signals (see chapter 5, user
examples)
% OUT
The mixed signal is available at the output.