GMSN! Pure ADSR Eurorack Module
GMSN! Pure ADSR Eurorack Module

GMSN! Pure ADSR Eurorack Module

The GMSN! Pure ADSR is used to create CV envelope, which can be patched into other modules to control pitch, filter cutoff and volume. These are either triggered externally or manually via the trigger button.

There are three envelope modes to choose from:

  • ADSR - Once triggered the envelope goes through all 4 stages: Attack, Decay, Sustain & Release
  • AR - The envelope will go straight into the Release phase as soon as Attack is completed. Great for drum synthesis
  • Trap Mode - This is a looping trapezoidal envelope with 4 stages: Attack, On, Release, Off. This can be retriggered externally or via the trigger button and can be used to create looping LFO shapes.

The design is based on the same chip used in the Arduino Uno, which means the same code, libraries and IDE can be used.

Module Specifications:
Output Voltage: 0 - 10v
Width: 8HP
Depth: 22mm
Power: 30mA +12v; 4mA -12v

Open Source Documentation:
Schematic PDF
Eagle Schematic
Eagle PCB
Illustrator Panel Artwork
Panel Outlines.dxf
Bill of Materials
Mouser BoM
GMSN! Pure ADSR Arduino Sketch

To do list:
Hardware debounce on trigger switch
Adjust knob ranges

Creative Commons License
This Open Source Design is licensed under a Creative Commons Attribution 4.0 International License.

Check out the tutorial for more information on how to get involved in Open Source Projects with Github.

For more info on how to Order PCBs check out the SDIY Blog.