Doepfer A-138p Performance Mixer

A-138p features:

• 4 channels
• controls and inputs for each channel
  • input (3.5 mm mono socket)
  • signal LED (as a coarse monitor of the incoming level, the level is measured after the gain control)
  • mute switch
  • gain (control to adapt different audio levels)
  • Level (the main volume control)
  • Aux
  • Pan
  • internal jumper for each channel to choose between Aux pre/post main Level control
• internal connection to the output module and to other A-138p modules
• A-138p requires A-138o (no stand-alone use)

A-138o features:

• level controls for Left, Right and Aux
• output sockets for Left, Right and Aux (3.5 mm mono sockets)
• A-138o requires at least one A-138p (no stand-alone use)
• Application example for Aux Send and Aux Return: looping in another module for effects (e.g. DSP module A-187-1, BBD module A-188-1, Spring Reverb A-199)
• Application example for Aux Send only: pre-listening in combination with the headphone amplifier module A-139-2

The following document shows the positions and functions of the jumpers and trimming potentiometers of the module: A138p_3_trimming_potentiometers_and_jumpers.pdf

A voltage controlled version of a performance mixer is also in the planning state. But this is a totally different project and noticeable more expensive because 4 high end VCAs are required for each input channel (i.e. 16 VCAs for the voltage controlled version of the A-138p). In addition 16 CV inputs with attenuators and LED displays for all functions are required.

A-138o:
Breite/Width:4TE / 4HP / 20.0 mm
Tiefe/Depth: 40 mm (gemessen ab der Rückseite der Frontplatte / measured from the rear side of the front panel)
Strombedarf/Current: + 20 mA (+12V) / - 20 mA (-12V)