Doepfer A-138u Dual Micro Mixer (2x3)

Simple, low-cost mixer with two units. Each unit is equipped with three inputs and one output. The upper unit has for each input a trimming potentiometer available that allows to adjust the amplification in the range 0 to 1 for each input (factory setting is 1 for all inputs). The inputs of the lower unit all have the same amplification factor 1.

The output of the upper unit is normalled to the first input of the lower unit. That way the module can be used also as a mixer with five inputs: for this the inputs 1, 2 and 3 of the upper unit and the inputs 2 and 3 of the lower unit are used. The sum output for all five signals is then the output of the lower unit. As soon as a plug is inserted into input 1 of the lower unit the module becomes a dual 3-in-1 mixer again.
The inputs and outputs are DC-coupled, i.e. audio and control signals can be mixed.