MRG FOLD (1st gen) Assembly Guide

Theory of operation:

  1. If you bought the PCB+Panel only, acquire needed components (See Bill of Materials . All components used in this guide are already included in the full DIY kit.
  2. Build the Main PCB.
  3. Build the Front PCB.
  4. Install the front panel.

Main PCB build

Step A1. Start by soldering all horizontal resistors and the two 5V1 Zener diodes.

Step A2. Solder all ceramic capacitors.

Step A3. Solder the two voltage regulators.

Step A4. Solder the 10-pin header Eurorack connector.

Step A5. Solder the two 22uF electrolytic capacitors.

Step A6. Solder the TL074, TLV274 and the TL072 opamps. If desired, you can solder IC sockets at this stage (two 14-pins and one 8-pins), and insert the ICs in the sockets later on.

Everything apart from the two 14-pin headers are soldered on the board now. It is time to solder the front PCB.

Front PCB Build

Step C1. Check the alignment of the PCB (label U1 is the top row), arrange the jack sockets and the potentiometers.

Step C2. Solder the components. Tip: in order to be sure to align the components to the front panel, install the front panel as in photo below and solder the components on the back.

Step C3. Solder the socket headers. Tip: In order to align the Main PCB’s pin headers to the Front PCB’s socket headers, assemble the two PCBs together, as in picture, and solder them in place.

Congratulations! The build is nearly done. All that’s left is installing the front panel.

Final Module Assembly

All that’s left now is to install the front panel, using nuts and washers to keep it attached, and adding the knobs to the potentiometers.

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