Doepfer A-138-a-b User Manual
doepfer
In 1
In 2
In 3
In 4
Input 1
Input 2
Input 3
Input 4
A-138
MIXER
Output
System A - 100
1. Introduction
Module A-138 (MIXER) is a four channel mixer, which
can be used with either control voltages or audio signals.
Each of the four inputs has an attenuator, and there’s a
master attenuator, so that the mixer can be used at the
end of the audio chain - ie. it can be used to interface
directly with an external mixer, amplifier, etc..
The module can be supplied in two versions:
•
•
Out
From about middle of 2004 the module is equipped with
an additional offset function for input 1. An internal
jumper is used to decide if control input 1 works as a
positive or negative DC offset generator provided that
no plug is inserted into input 1.
MIXER
A-138 a: potentiometers with linear response, so
especially suitable for control voltage mixing.
A-138 b: potentiometers with logarithmic response,
so especially suitable for audio signal mixing.
A-138
1
A-138
MIXER
System A - 100
doepfer
2. MIXER - Overview
A-138
lin
Input 1
0
Input 2
0
Input 3
0
Input 4
0
Output
0
MIXER
exp
In 1
10
In 2
10
In 3
10
In 4
10
Out
10
➀
➁
➂
➃
➄
➅
Controls and markings:
1 lin. / exp.: indication of type of mixer:
A-138 a: linear potentiometers
A-138 b: logarithmic potentiometers
2 In 1: Attenuator for input !
3 In 2: Attenuator for input "
4 In 3: Attenuator for input §
In 4: Attenuator for input
5
Out: Output attenuator
6
$
In / Outputs:
Input 1
!
Input 2
"
Input 3
§
$ Input 4
% Output
2
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