SwitchPCB

3PDT Footswitch Board (SwitchPCB v2)

A small board that solders onto a standard 3PDT stomp switch and gives every Super-Freq pedal the same true-bypass wiring. It's a KiCad 10 update of the Eagle SwitchPCB (2022).

Circuit (same as the Eagle board)

• Engaged: input jack → IN, OUT → output jack, and LED cathode → GND (LED on).
• Bypassed:
  • input jack → output jack, through the BYPASS link;
  • the circuit's IN is shorted to GND (stops oscillation and pops).

Pads (seen from inside the box, left to right)

• Ribbon: the middle four pads line up with the pedal boards' 1×4 header (IN / LED / GND / OUT, 2.54 mm), so a 4-way ribbon runs straight with no twist.
• Jack grounds: wire them to the pedal board's IG/OG pads, as before.

Build

1. Push the switch's lugs through the board from the unprinted side. The printed side, with the labels, faces into the box. This matches the pedal boards, where the front faces inside.
2. Solder the nine lugs.
3. Wire the pads.

Changes from the Eagle version

• Lug slots: the lug holes are now plated slots, 2.8 × 1.3 mm (the PedalDivision size), on the switch's lug grid: 5.3 mm between poles × 4.7 mm between throws, as in your Eagle 3PDT_PCM. The pads are 3.8 × 2.4 mm. The slots hold the switch square while you solder. (Eagle v1 used 2.8 mm round holes.)
• Which row is "engaged" changed. It's now the row nearest the pads. Electrically it's the same switch, but every track now runs straight on the front copper: no vias, nothing on the back.
• Pad order is reversed from v1, on purpose. The old Eagle pedal boards had their pots on the top layer, so from inside the box their pads read OUT · G · LED · IN, which matched the v1 switch board (you confirmed the ribbon ran straight on 2026-10-06). The new KiCad pedal boards (UF1, UF3 v1.1, Hyper, Rat, Trem v2, Penfold) put the pots on the back, so from inside they read IN · LED · GND · OUT. v2 matches them.
  • v2 switch + new KiCad pedal board: straight ribbon.
  • v1 switch + new KiCad pedal board: fit the v1 board upside down, with the lugs through from its printed side. The pads are plated through, and the order then matches. Or cross the four wires.
  • v2 switch + old Eagle pedal board: the same: flip it, or cross the wires.
• Board size: 17.15 × 20.95 mm (same as before).
• Tracks: 0.5 mm.
• Labels: IJ / IN / LED / G / OUT / OJ, plus "SUPER-FREQ 3PDT v2".
• 3D model: the blue 3PDT model is attached.

Files

• production/SwitchPCB.zip: Gerbers + drill files for JLCPCB (no assembly; everything is hand-soldered).

• scripts/:

  • build_switchpcb.py: writes the schematic and library;
  • buildpcb_switchpcb.py: places the board;
  • route_switchpcb.py: adds the hand-placed tracks.

  Don't re-run them after editing the board in KiCad; they overwrite it.