Reference Sheet · Hardware Standards

Eurorack Power & Audio Jack Normalling Reference

Pinout, polarity, and cascaded switched-jack routing reference for Doepfer A-100 10-pin power headers, 1N5819WS Schottky protection, and WQP-PJ398SM (Thonkiconn) 3.5mm jacks.

1. Standard 10-Pin (`2x5`) Eurorack Power Header & Protection

`Conn_02x05_Odd_Even` pinout and reverse-polarity protection wiring
Header Pins	Raw Net	Protection & Bulk Filtering	Protected Rail
`j_pwr[1, 2]` Red Stripe (-12V)	`-12V_RAW`	`d_neg["K"]` at `-12V_RAW` ← `d_neg["A"]` at `-12V` `c_bulk_neg[1]` (`+`) at `GND`, `c_bulk_neg[2]` (`-`) at `-12V`	`-12V` (`vee`) `NetClass("Power", 0.5mm)`
`j_pwr[3, 4, 5, 6, 7, 8]` Centre Ground	`GND`	Direct connection to stitched `F.Cu` and `B.Cu` ground planes	`GND` (`gnd`) `NetClass("Power", 0.5mm)`
`j_pwr[9, 10]` Top Pair (+12V)	`+12V_RAW`	`d_pos["A"]` at `+12V_RAW` → `d_pos["K"]` at `+12V` `c_bulk_pos[1]` (`+`) at `+12V`, `c_bulk_pos[2]` (`-`) at `GND`	`+12V` (`vcc`) `NetClass("Power", 0.5mm)`

2. `WQP-PJ398SM` (Thonkiconn) Switched Jack Pinout

`Connector_Audio:AudioJack2_SwitchT` symbol pins and mechanical behaviour
Symbol Pin ID	Contact Role	Unpatched State (No Plug)	Patched State (3.5mm Plug Inserted)	SKiDL Connection in `buffered_multiple.py`
`j["T"]`	Tip (Signal)	Spring-loaded contact touches `TN`	Connects to patch cable Tip; lifts off `TN`	Input: `in_jack += j_in["T"]` Output: `jack_tip += j_out["T"]`
`j["TN"]`	Switched Tip Normal	Conducts default normalled signal into `T`	Mechanically disconnected (open circuit)	Input: `norm_in += j_in["TN"]` Output: `j_out["TN"] += builtins.NC`
`j["S"]`	Sleeve (Ground)	Connected to `GND`	Connects patch cable shield/sleeve to `GND`	`gnd += j["S"]`

3. Cascaded Normalling Matrix (`1:3` / `1:6` / `1:9`)

Output routing across all patching combinations of `IN_1` (`J2`), `IN_2` (`J6`), and `IN_3` (`J10`)
`IN_1` (`J2`)	`IN_2` (`J6`)	`IN_3` (`J10`)	Outputs `1A–1C`	Outputs `2A–2C`	Outputs `3A–3C`	Effective Mode
Unpatched	Unpatched	Unpatched	`0V` (`GND` via `J2.TN`)	`0V` (`CH1_BUF` via `J6.TN`)	`0V` (`CH2_BUF` via `J10.TN`)	All 9 outputs quiet at `0.00V`
Patched (`V1`)	Unpatched	Unpatched	`V1` (3×)	`V1` (3× via `CH1_BUF`)	`V1` (3× via `CH2_BUF`)	1-to-9 Buffered Multiple
Patched (`V1`)	Unpatched	Patched (`V3`)	`V1` (3×)	`V1` (3× via `CH1_BUF`)	`V3` (3×)	1-to-6 (CH1+2) + 1-to-3 (CH3)
Patched (`V1`)	Patched (`V2`)	Unpatched	`V1` (3×)	`V2` (3×)	`V2` (3× via `CH2_BUF`)	1-to-3 (CH1) + 1-to-6 (CH2+3)
Patched (`V1`)	Patched (`V2`)	Patched (`V3`)	`V1` (3×)	`V2` (3×)	`V3` (3×)	Triple Independent 1-to-3