Multiple

ST-01 Multiple

A 3HP Eurorack passive multiple from Schenktronics: two banks of four jacks, and a latching button that links them into one eight-jack multiple. The button doubles as a performance mute. No power needed.

Features

• 3HP, 15 mm deep behind the panel (skiff-friendly), no power needed
• Two 4-jack banks, or one 8-jack multiple when linked
• Latching link button between the banks: in = linked, out = split
• All through-hole, 30 solder joints: a good first kit

Documentation

Repository layout

hardware/
  ST01_Multiple.step          3D model of the assembled module
  multiple/                   Main PCB (KiCad 5.1 schematic, KiCad 10 PCB)
    Multiple.sch                 Schematic
    Multiple.kicad_pcb           PCB layout
    Multiple.step                3D model
    BOM.ods                      Original BOM spreadsheet
  panel/                      Faceplate (KiCad 10, made as an aluminum PCB)
    MultipleFaceplate.kicad_pcb  Faceplate layout
    MultipleFaceplate.step       3D model
  jig/                        3D-printable solder jig (see below)
    ST-01_Solder_Jig.stl         Holds the jacks and button while you solder
docs/                         Manual, assembly guide, BOM, images
  pdf/                          PDF versions of the manual and assembly guide

The .github/ folder holds the automation that builds the PDFs. You can ignore it.

Fabrication

Sourcing your own parts

The BOM lists every part. The jack pads are oval so the board can also take panel-mount style jacks, which may be easier to source. The CUI MJ-3507 is one example: its sleeve is a solder lug rather than a pin, so each one needs a short wire from that lug to the jack's square pad.

Solder jig (optional)

hardware/jig/ST-01_Solder_Jig.stl is a 3D-printable jig (28 x 112 x 12 mm) that holds the eight jacks and the button square and centered while you solder them. It replaces the faceplate as the alignment guide, so all nine parts can be soldered in one go.

1. Print it in PLA, pockets facing up. It needs no supports.
2. Take the nuts off the jacks and leave the cap off the button.
3. Fit the jacks and the button into the front of the PCB, the side with the part outlines, as in the Assembly Guide. Don't solder anything yet.
4. Lower the jig over the parts, pockets down, with the end engraved "J1" over J1. Wiggle it until every jack and the button seat into their pockets. Each pocket only fits its part one way round, and the pocket mouths are chamfered to guide the parts in.
5. Turn the whole stack over so the jig sits on the bench and the back of the PCB (printed "ST-01 v1.1") faces up. Solder all the joints. The board sits 4 mm above the jig, so the plastic stays well clear of the iron.
6. Lift the board out of the jig, fit the button cap, and continue from the faceplate step of the Assembly Guide.

The pockets are a close fit (0.1 mm per side). If your printer makes holes small and the jack threads won't drop in, try a slightly larger horizontal-expansion or hole-compensation setting in your slicer.

License

This hardware design and its documentation are licensed under CC BY-NC-SA 4.0. See LICENSE.

The Schenktronics name and logo are trademarks of Schenktronics LLC and are not covered by the CC BY-NC-SA 4.0 license.

Links

• Shop: https://schenktronics.com/product/st-01/
• Docs page: https://schenktronics.com/docs/st-01/
• Website: https://schenktronics.com