Add PCB layout and panel design

PCB: - 28x100mm 2-layer board outline - Mounting holes for M3 screws - Component placement guide with coordinates - Routing guidelines and design rules Panel: - 6HP (30x128.5mm) Eurorack panel specification - SVG design with hole positions - Supports aluminum, PCB, or acrylic manufacturing Updated main README with full project documentation.
2026-01-23 03:40:00 +01:00
parent 64f9e34fc3
commit c4e1a43dfa
7 changed files with 739 additions and 17 deletions
@@ -1,35 +1,117 @@
-# SN-L00
+# SN-L00 Latency Tester

-Eurorack latency testing module by SubModular.
+Eurorack module for measuring round-trip latency in audio/CV signal chains.

-## Overview
+**Organization**: [SubModular](https://git.sub-net.at/submodular) / Sub-Net e.U.

-SN-L00 measures round-trip latency in Eurorack signal chains. Useful for testing delay through effects, digital modules, audio interfaces, and DAW processing.
+## Features
+
+- Measures latency from 0.01ms to 999ms
+- 128×32 OLED display showing milliseconds
+- Three modes: Single shot, Continuous, Statistics
+- Skiff-friendly depth (<25mm)
+- USB serial output for logging
+
+## Specifications
+
+| Parameter | Value |
+|-----------|-------|
+| Width | 6 HP (30mm) |
+| Depth | <25mm |
+| Power +12V | ~25mA |
+| Power -12V | 0mA |
+| Resolution | 0.01ms |
+| Output | 0-3.3V trigger |
+| Input | 0-10V tolerant |

 ## Project Structure

 ```
-hardware/
-  kicad/      # Schematics and PCB
-  panel/      # Front panel design
-firmware/     # Microcontroller code (if applicable)
-docs/         # Documentation and user manual
+SN-L00/
+├── hardware/
+│   ├── BOM.md              # Bill of materials with LCSC part numbers
+│   ├── kicad/              # KiCad schematic and PCB
+│   │   ├── SN-L00.kicad_pro
+│   │   ├── SN-L00.kicad_sch
+│   │   ├── SN-L00.kicad_pcb
+│   │   ├── README.md       # ASCII schematic reference
+│   │   └── PCB_LAYOUT.md   # Placement guide
+│   └── panel/
+│       ├── PANEL_SPEC.md   # Dimensions and specifications
+│       └── SN-L00_panel.svg # Panel design
+├── firmware/
+│   ├── CMakeLists.txt      # Pico SDK build
+│   ├── README.md           # Build instructions
+│   ├── include/            # Header files
+│   └── src/                # Source files
+└── docs/
+    └── DESIGN.md           # Technical design document
 ```

-## Specifications
+## Hardware

- Width: TBD HP
- Power: TBD mA (+12V), TBD mA (-12V)
- Depth: TBD mm
+### Components

-## Status
+| Part | Description |
+|------|-------------|
+| MCU | RP2040-Zero (Waveshare) |
+| Display | 0.91" OLED 128×32 I2C |
+| Output buffer | 74LVC1G17 Schmitt trigger |
+| Input buffer | MCP6001 op-amp |
+| Regulator | AMS1117-3.3 LDO |

-Early development - concept phase.
+Full BOM with LCSC part numbers in [hardware/BOM.md](hardware/BOM.md).
+
+### Manufacturing
+
+- PCB: 2-layer, 28×100mm
+- Assembly: PCBWay or similar (SMD parts)
+- Hand-solder: RP2040-Zero module, OLED module
+- Panel: Aluminum or PCB (6HP)
+
+## Firmware
+
+Built with Raspberry Pi Pico SDK.
+
+```bash
+export PICO_SDK_PATH=/path/to/pico-sdk
+cd firmware
+mkdir build && cd build
+cmake .. && make
+```
+
+Flash `sn_l00.uf2` via USB bootloader.
+
+See [firmware/README.md](firmware/README.md) for details.
+
+## Usage
+
+1. Connect **TRIG OUT** to your signal chain input
+2. Connect your signal chain output to **RETURN IN**
+3. Press button to measure latency
+4. Long press to toggle continuous mode
+
+### Modes
+
+- **SINGLE**: Press to measure once
+- **CONT**: Auto-measures every 500ms, shows live reading
+- **STATS**: Shows min/max/average after continuous mode
+
+## Typical Latency Values
+
+| Source | Expected Latency |
+|--------|------------------|
+| Analog modules | <0.1ms |
+| Digital Eurorack (DSP) | 1-5ms |
+| Audio interface round-trip | 3-20ms |
+| DAW + plugins | 5-50ms+ |

 ## License

 TBD

---
+## Links

-*SubModular - Eurorack hardware by Sub-Net e.U.*
+- Repository: https://git.sub-net.at/submodular/SN-L00
+- Organization: https://git.sub-net.at/submodular
+- Parent: [Sub-Net e.U.](https://sub-net.at)
@@ -0,0 +1,216 @@
+# SN-L00 PCB Layout Guide
+
+## Board Dimensions
+
+| Parameter | Value | Notes |
+|-----------|-------|-------|
+| Width | 28.0mm | 6HP panel = 30mm, PCB 1mm clearance each side |
+| Height | 100.0mm | Fits standard 3U with clearance |
+| Thickness | 1.6mm | Standard PCB |
+| Layers | 2 | Front + Back copper |
+| Depth (mounted) | ~22mm | Skiff-friendly (<25mm) |
+
+## Mounting Holes
+
+| Hole | Position | Size |
+|------|----------|------|
+| MH1 (top) | 14.0, 5.0 | 3.2mm (M3) |
+| MH2 (bottom) | 14.0, 95.0 | 3.2mm (M3) |
+
+## Component Placement (Top to Bottom)
+
+```
+     0mm                    28mm
+      │←────── 28mm ───────→│
+      ┌────────────────────┐ ─┬─ 0mm
+      │    ○ MH1 (M3)      │  │
+      │                    │  │ 5mm
+      ├────────────────────┤ ─┤
+      │                    │  │
+      │  ┌──────────────┐  │  │
+      │  │    OLED      │  │  │ 10-25mm
+      │  │   MOD2       │  │  │
+      │  │  (128x32)    │  │  │
+      │  └──────────────┘  │  │
+      │                    │  │
+      ├────────────────────┤ ─┤
+      │       [BTN]        │  │ 28-35mm
+      │        SW1         │  │
+      ├────────────────────┤ ─┤
+      │                    │  │
+      │  ┌──────────────┐  │  │
+      │  │  RP2040-Zero │  │  │ 38-55mm
+      │  │    MOD1      │  │  │
+      │  │  (18x23mm)   │  │  │
+      │  └──────────────┘  │  │
+      │                    │  │
+      ├────────────────────┤ ─┤
+      │  SMD Components    │  │
+      │  U1 U2 U3          │  │ 58-75mm
+      │  C1-C5 R1-R6       │  │
+      │  D1-D4 D2(LED)     │  │
+      ├────────────────────┤ ─┤
+      │                    │  │
+      │  ○ J2    ○ J3      │  │ 78-88mm
+      │  TRIG   RETURN     │  │
+      │                    │  │
+      ├────────────────────┤ ─┤
+      │  ═══════════════   │  │ 88-95mm
+      │       J1           │  │
+      │  (Eurorack 2x5)    │  │
+      ├────────────────────┤ ─┤
+      │    ○ MH2 (M3)      │  │ 95mm
+      └────────────────────┘ ─┴─ 100mm
+```
+
+## Detailed Placement Coordinates
+
+### Modules (Hand-solder)
+
+| Ref | Component | Center X | Center Y | Rotation |
+|-----|-----------|----------|----------|----------|
+| MOD2 | OLED 128x32 | 14.0 | 17.5 | 0° |
+| MOD1 | RP2040-Zero | 14.0 | 46.5 | 0° |
+
+### User Interface
+
+| Ref | Component | Center X | Center Y | Rotation |
+|-----|-----------|----------|----------|----------|
+| SW1 | Tactile 6x6mm | 14.0 | 31.5 | 0° |
+| D2 | Power LED | 24.0 | 31.5 | 0° |
+| R2 | LED resistor 1K | 24.0 | 36.0 | 90° |
+
+### Connectors
+
+| Ref | Component | Center X | Center Y | Rotation |
+|-----|-----------|----------|----------|----------|
+| J2 | Thonkiconn TRIG | 7.0 | 83.0 | 0° |
+| J3 | Thonkiconn RETURN | 21.0 | 83.0 | 0° |
+| J1 | 2x5 Eurorack | 14.0 | 92.0 | 0° |
+
+### Power Section (Back side recommended)
+
+| Ref | Component | Center X | Center Y | Rotation | Side |
+|-----|-----------|----------|----------|----------|------|
+| D1 | SS14 Schottky | 7.0 | 65.0 | 0° | Back |
+| U1 | AMS1117-3.3 | 14.0 | 65.0 | 0° | Back |
+| C1 | 10uF input | 10.0 | 60.0 | 0° | Back |
+| C2 | 10uF output | 18.0 | 60.0 | 0° | Back |
+| C3 | 100nF output | 21.0 | 60.0 | 0° | Back |
+
+### Signal Conditioning
+
+| Ref | Component | Center X | Center Y | Rotation | Side |
+|-----|-----------|----------|----------|----------|------|
+| U2 | 74LVC1G17 | 7.0 | 72.0 | 0° | Front |
+| C4 | 100nF (U2) | 7.0 | 68.0 | 0° | Front |
+| R3 | 100R trig | 7.0 | 76.0 | 90° | Front |
+| U3 | MCP6001 | 21.0 | 72.0 | 0° | Front |
+| C5 | 100nF (U3) | 21.0 | 68.0 | 0° | Front |
+| R4 | 10K input | 21.0 | 76.0 | 90° | Front |
+| R5 | 10K divider | 18.0 | 76.0 | 90° | Front |
+| R6 | 22K divider | 18.0 | 72.0 | 90° | Front |
+| D3 | BAT54 clamp | 24.0 | 70.0 | 90° | Front |
+| D4 | BAT54 clamp | 24.0 | 74.0 | 90° | Front |
+
+### Button
+
+| Ref | Component | Center X | Center Y | Rotation |
+|-----|-----------|----------|----------|----------|
+| R1 | 10K pullup | 10.0 | 35.0 | 0° |
+
+## Routing Guidelines
+
+### Net Classes
+
+| Class | Width | Clearance | Via Drill |
+|-------|-------|-----------|-----------|
+| Default | 0.25mm | 0.2mm | 0.3mm |
+| Power | 0.5mm | 0.3mm | 0.4mm |
+| Signal | 0.2mm | 0.2mm | 0.3mm |
+
+### Power Routing
+
+1. **+12V** path: J1 pin 4 → D1 → C1 → U1 VIN
+2. **+3.3V** path: U1 VOUT → C2/C3 → distribute to all ICs
+3. **GND**: Use ground pour on back layer, via stitch near decoupling caps
+
+### Signal Routing Priority
+
+1. I2C (SDA/SCL): Keep short, parallel, 0.5mm spacing
+2. TRIG_OUT: Direct from RP2040 GP2 → U2 → R3 → J2
+3. RETURN_IN: J3 → R4 → divider → U3 → RP2040 GP3
+4. BTN: RP2040 GP4 → R1 → SW1 → GND
+
+### Ground Plane
+
+- Fill back copper with GND zone
+- Via stitch every 5-10mm
+- Keep clear around power input for thermal relief
+- Connect GND pins of J2/J3 directly to plane
+
+## Design Rules (PCBWay Compatible)
+
+| Parameter | Value |
+|-----------|-------|
+| Min trace width | 0.15mm (0.2mm preferred) |
+| Min clearance | 0.15mm (0.2mm preferred) |
+| Min via drill | 0.3mm |
+| Min via diameter | 0.6mm |
+| Min hole size | 0.3mm |
+| Min annular ring | 0.15mm |
+
+## Silkscreen
+
+### Front
+
+- Component references (small, 0.8mm text)
+- Jack labels: "TRIG" and "RETURN"
+- "SN-L00 v0.1" at bottom
+- "SubModular" at top
+
+### Back
+
+- "SN-L00" centered
+- Pin 1 indicators for ICs
+- Polarity markers for D1, power header
+- "git.sub-net.at/submodular/SN-L00"
+
+## Gerber Output
+
+When exporting for PCBWay:
+
+```
+Required files:
+- F.Cu (Front copper)
+- B.Cu (Back copper)
+- F.SilkS (Front silkscreen)
+- B.SilkS (Back silkscreen)
+- F.Mask (Front soldermask)
+- B.Mask (Back soldermask)
+- Edge.Cuts (Board outline)
+- *.drl (Drill file)
+
+Settings:
+- Format: Gerber X2
+- Drill: Excellon
+- Units: mm
+- Coordinate format: 4.6
+```
+
+## Assembly Notes
+
+1. PCBWay can assemble all SMD parts on both sides
+2. Hand-solder: MOD1 (RP2040-Zero), MOD2 (OLED)
+3. Jacks (J2, J3) can be assembled or hand-soldered
+4. Power header (J1) usually hand-soldered for alignment
+
+## Checking Before Order
+
+- [ ] DRC passes with no errors
+- [ ] All nets connected (no airwires)
+- [ ] Mounting holes align with panel
+- [ ] Jacks align with panel holes
+- [ ] Power header polarity marked
+- [ ] Silkscreen readable and not over pads
+- [ ] Ground plane connected properly
@@ -0,0 +1,191 @@
+(kicad_pcb
+  (version 20240108)
+  (generator "pcbnew")
+  (generator_version "8.0")
+  (general
+    (thickness 1.6)
+    (legacy_teardrops no)
+  )
+  (paper "A4")
+  (title_block
+    (title "SN-L00 Latency Tester")
+    (date "2026-01-23")
+    (rev "0.1")
+    (company "SubModular")
+  )
+  (layers
+    (0 "F.Cu" signal)
+    (31 "B.Cu" signal)
+    (32 "B.Adhes" user "B.Adhesive")
+    (33 "F.Adhes" user "F.Adhesive")
+    (34 "B.Paste" user)
+    (35 "F.Paste" user)
+    (36 "B.SilkS" user "B.Silkscreen")
+    (37 "F.SilkS" user "F.Silkscreen")
+    (38 "B.Mask" user)
+    (39 "F.Mask" user)
+    (40 "Dwgs.User" user "User.Drawings")
+    (41 "Cmts.User" user "User.Comments")
+    (42 "Eco1.User" user "User.Eco1")
+    (43 "Eco2.User" user "User.Eco2")
+    (44 "Edge.Cuts" user)
+    (45 "Margin" user)
+    (46 "B.CrtYd" user "B.Courtyard")
+    (47 "F.CrtYd" user "F.Courtyard")
+    (48 "B.Fab" user)
+    (49 "F.Fab" user)
+    (50 "User.1" user)
+    (51 "User.2" user)
+    (52 "User.3" user)
+    (53 "User.4" user)
+    (54 "User.5" user)
+    (55 "User.6" user)
+    (56 "User.7" user)
+    (57 "User.8" user)
+    (58 "User.9" user)
+  )
+  (setup
+    (pad_to_mask_clearance 0)
+    (allow_soldermask_bridges_in_footprints no)
+    (pcbplotparams
+      (layerselection 0x00010fc_ffffffff)
+      (plot_on_all_layers_selection 0x0000000_00000000)
+      (disableapertmacros no)
+      (usegerberextensions no)
+      (usegerberattributes yes)
+      (usegerberadvancedattributes yes)
+      (creategerberjobfile yes)
+      (dashed_line_dash_ratio 12.000000)
+      (dashed_line_gap_ratio 3.000000)
+      (svgprecision 4)
+      (plotframeref no)
+      (viasonmask no)
+      (mode 1)
+      (useauxorigin no)
+      (hpglpennumber 1)
+      (hpglpenspeed 20)
+      (hpglpendiameter 15.000000)
+      (pdf_front_fp_property_popups yes)
+      (pdf_back_fp_property_popups yes)
+      (dxfpolygonmode yes)
+      (dxfimperialunits yes)
+      (dxfusepcbnewfont yes)
+      (psnegative no)
+      (psa4output no)
+      (plotreference yes)
+      (plotvalue yes)
+      (plotfptext yes)
+      (plotinvisibletext no)
+      (sketchpadsonfab no)
+      (subtractmaskfromsilk no)
+      (outputformat 1)
+      (mirror no)
+      (drillshape 1)
+      (scaleselection 1)
+      (outputdirectory "")
+    )
+  )
+  (net 0 "")
+  (net 1 "GND")
+  (net 2 "+12V")
+  (net 3 "+3.3V")
+  (net 4 "SDA")
+  (net 5 "SCL")
+  (net 6 "TRIG_OUT")
+  (net 7 "RETURN_IN")
+  (net 8 "BTN")
+
+  ;; Board outline - 6HP Eurorack PCB
+  ;; Width: 28mm (6HP = 30mm panel, PCB slightly narrower)
+  ;; Height: 100mm (fits behind panel with clearance)
+  (gr_rect
+    (start 0 0)
+    (end 28 100)
+    (stroke
+      (width 0.15)
+      (type solid)
+    )
+    (fill none)
+    (layer "Edge.Cuts")
+    (uuid "board-outline")
+  )
+
+  ;; Mounting holes (M3, 3.2mm)
+  ;; Top mounting hole
+  (footprint "MountingHole:MountingHole_3.2mm_M3"
+    (layer "F.Cu")
+    (uuid "mh1")
+    (at 14 5)
+    (property "Reference" "MH1"
+      (at 0 -3 0)
+      (layer "F.SilkS")
+      (effects (font (size 1 1) (thickness 0.15)))
+    )
+    (property "Value" "MountingHole"
+      (at 0 3 0)
+      (layer "F.Fab")
+      (effects (font (size 1 1) (thickness 0.15)))
+    )
+    (pad "" np_thru_hole circle
+      (at 0 0)
+      (size 3.2 3.2)
+      (drill 3.2)
+      (layers "*.Cu" "*.Mask")
+    )
+  )
+
+  ;; Bottom mounting hole
+  (footprint "MountingHole:MountingHole_3.2mm_M3"
+    (layer "F.Cu")
+    (uuid "mh2")
+    (at 14 95)
+    (property "Reference" "MH2"
+      (at 0 -3 0)
+      (layer "F.SilkS")
+      (effects (font (size 1 1) (thickness 0.15)))
+    )
+    (property "Value" "MountingHole"
+      (at 0 3 0)
+      (layer "F.Fab")
+      (effects (font (size 1 1) (thickness 0.15)))
+    )
+    (pad "" np_thru_hole circle
+      (at 0 0)
+      (size 3.2 3.2)
+      (drill 3.2)
+      (layers "*.Cu" "*.Mask")
+    )
+  )
+
+  ;; Component placement guide (active from top to bottom):
+  ;; Y=10-25: OLED module (MOD2)
+  ;; Y=28-35: Button (SW1)
+  ;; Y=38-55: RP2040-Zero (MOD1)
+  ;; Y=58-75: SMD components (LDO, buffers, passives)
+  ;; Y=78-90: Jacks (J2, J3) and Power header (J1)
+
+  ;; Text annotations for assembly
+  (gr_text "SN-L00 v0.1"
+    (at 14 98 0)
+    (layer "F.SilkS")
+    (uuid "title-text")
+    (effects
+      (font (size 1.2 1.2) (thickness 0.2))
+      (justify center)
+    )
+  )
+
+  (gr_text "SubModular"
+    (at 14 2 0)
+    (layer "F.SilkS")
+    (uuid "company-text")
+    (effects
+      (font (size 0.8 0.8) (thickness 0.15))
+      (justify center)
+    )
+  )
+
+  ;; Ground plane zones would be added here
+  ;; (zone ...)
+
+)
@@ -0,0 +1,161 @@
+# SN-L00 Panel Specification
+
+## Eurorack 6HP Panel Dimensions
+
+| Parameter | Value | Notes |
+|-----------|-------|-------|
+| Width | 30.00mm | 6 × 5.08mm (6HP) |
+| Height | 128.50mm | 3U standard |
+| Thickness | 1.5-2.0mm | Aluminum or PCB |
+| Corner radius | 0mm | Square corners |
+
+## Mounting Holes
+
+Eurorack standard mounting rail positions:
+
+| Hole | X | Y | Diameter | Notes |
+|------|---|---|----------|-------|
+| Top Left | 7.5mm | 3.0mm | 3.2mm | Horizontal slot optional |
+| Top Right | 22.5mm | 3.0mm | 3.2mm | Horizontal slot optional |
+| Bottom Left | 7.5mm | 125.5mm | 3.2mm | Horizontal slot optional |
+| Bottom Right | 22.5mm | 125.5mm | 3.2mm | Horizontal slot optional |
+
+**Note**: Slots (elongated holes) of 3.2mm × 4mm allow for rail tolerance.
+
+## Component Holes
+
+| Component | X | Y | Diameter | Notes |
+|-----------|---|---|----------|-------|
+| OLED cutout | 15.0mm | 25.0mm | 28×12mm rect | Rectangular window |
+| Button | 15.0mm | 45.0mm | 7.0mm | For 6mm tactile + cap |
+| LED (power) | 24.0mm | 45.0mm | 3.0mm | For 3mm LED or light pipe |
+| Jack TRIG | 7.5mm | 95.0mm | 6.0mm | Thonkiconn PJ398SM |
+| Jack RETURN | 22.5mm | 95.0mm | 6.0mm | Thonkiconn PJ398SM |
+
+## Panel Layout Drawing
+
+```
+      ←───── 30.00mm ─────→
+
+      ┌─────────────────────┐ ─┬─ 0.00mm
+      │  ○           ○      │  │ 3.00mm (mounting holes)
+      │                     │  │
+      │      SubModular     │  │ 12.00mm
+      │                     │  │
+      │  ┌───────────────┐  │  │
+      │  │               │  │  │
+      │  │     OLED      │  │  │ 19-31mm (display window)
+      │  │   DISPLAY     │  │  │
+      │  │               │  │  │
+      │  └───────────────┘  │  │
+      │                     │  │
+      │       SN-L00        │  │ 38.00mm
+      │                     │  │
+      │         ◯     •     │  │ 45.00mm (button + LED)
+      │        BTN   PWR    │  │
+      │                     │  │
+      │                     │  │
+      │                     │  │
+      │   ┌───┐     ┌───┐   │  │
+      │   │   │     │   │   │  │
+      │   │ ○ │     │ ○ │   │  │ 95.00mm (jacks)
+      │   │   │     │   │   │  │
+      │   └───┘     └───┘   │  │
+      │   TRIG     RETURN   │  │ 105.00mm (labels)
+      │                     │  │
+      │    LATENCY TESTER   │  │ 115.00mm
+      │                     │  │
+      │  ○           ○      │  │ 125.50mm (mounting holes)
+      └─────────────────────┘ ─┴─ 128.50mm
+```
+
+## OLED Display Window
+
+The 0.91" 128×32 OLED module dimensions:
+
+| Parameter | Value |
+|-----------|-------|
+| Module size | ~38 × 12mm |
+| Active area | ~22 × 6mm |
+| Mounting | Pin header on edge |
+
+**Panel cutout**: 28mm × 10mm rectangle, centered at (15.0, 25.0)
+
+Alternatively, a slightly larger window (30 × 12mm) gives tolerance for module alignment.
+
+## Material Options
+
+### Option A: Aluminum (Professional)
+
+- Material: 1.5mm aluminum 5052-H32
+- Finish: Brushed, anodized black
+- Printing: Laser engraved or UV printed
+- Cost: ~€10-15/panel (qty 5)
+
+### Option B: PCB Panel (DIY-friendly)
+
+- Material: 1.6mm FR4
+- Finish: Black soldermask, ENIG
+- Printing: Silkscreen white
+- Cost: ~€2-5/panel (qty 5 from PCBWay)
+
+### Option C: Acrylic (Budget)
+
+- Material: 3mm black acrylic
+- Finish: Laser cut
+- Printing: Engraved or adhesive labels
+- Cost: ~€3-5/panel
+
+## PCB Panel Design
+
+If using a PCB as the panel:
+
+```
+Front copper: None (for clean look) or decorative pattern
+Back copper: Optional ground plane
+Silkscreen: All text and graphics
+Soldermask: Black (or custom color)
+```
+
+## Graphics & Text
+
+### Suggested Layout
+
+| Element | Position | Size | Font |
+|---------|----------|------|------|
+| "SubModular" | Top center, Y=12mm | 2.5mm | Bold sans-serif |
+| "SN-L00" | Above button, Y=38mm | 3.0mm | Bold |
+| "TRIG" | Below left jack, Y=105mm | 2.0mm | Regular |
+| "RETURN" | Below right jack, Y=105mm | 2.0mm | Regular |
+| "LATENCY TESTER" | Bottom, Y=115mm | 1.5mm | Light |
+
+### Icon Ideas
+
+- Small waveform graphic near jacks
+- Clock/timer icon
+- Sub-Net logo (if available)
+
+## Hole Tolerances
+
+| Hole Type | Nominal | Tolerance |
+|-----------|---------|-----------|
+| Mounting | 3.2mm | +0.1/-0.0 |
+| Jack | 6.0mm | +0.1/-0.0 |
+| Button | 7.0mm | +0.2/-0.0 |
+| LED | 3.0mm | +0.1/-0.0 |
+
+## Files to Create
+
+For manufacturing:
+
+1. **DXF/DWG** - For laser cutting (aluminum/acrylic)
+2. **KiCad PCB** - For PCB panel
+3. **SVG** - For graphics reference
+4. **PDF** - Dimensional drawing
+
+## Assembly
+
+1. Mount OLED module with M2 standoffs or double-sided tape
+2. Jacks mount through panel, secured with nut
+3. Button may need extension shaft or cap
+4. LED can use light pipe for front visibility
@@ -0,0 +1,72 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg"
+     width="30mm" height="128.5mm"
+     viewBox="0 0 30 128.5">
+
+  <title>SN-L00 Eurorack Panel</title>
+  <desc>6HP Eurorack panel for SN-L00 Latency Tester</desc>
+
+  <defs>
+    <style>
+      .panel { fill: #1a1a1a; }
+      .hole { fill: none; stroke: #ff0000; stroke-width: 0.1; }
+      .cutout { fill: none; stroke: #00ff00; stroke-width: 0.1; }
+      .text { fill: #ffffff; font-family: Arial, sans-serif; }
+      .text-small { font-size: 2px; }
+      .text-medium { font-size: 2.5px; }
+      .text-large { font-size: 3px; }
+      .silkscreen { fill: none; stroke: #ffffff; stroke-width: 0.2; }
+    </style>
+  </defs>
+
+  <!-- Panel background -->
+  <rect class="panel" x="0" y="0" width="30" height="128.5"/>
+
+  <!-- Mounting holes (3.2mm) - RED for drill -->
+  <!-- Top mounting holes -->
+  <circle class="hole" cx="7.5" cy="3" r="1.6"/>
+  <circle class="hole" cx="22.5" cy="3" r="1.6"/>
+  <!-- Bottom mounting holes -->
+  <circle class="hole" cx="7.5" cy="125.5" r="1.6"/>
+  <circle class="hole" cx="22.5" cy="125.5" r="1.6"/>
+
+  <!-- OLED display window (28x10mm rectangle) - GREEN for cutout -->
+  <rect class="cutout" x="1" y="20" width="28" height="10" rx="0.5"/>
+
+  <!-- Button hole (7mm) -->
+  <circle class="hole" cx="15" cy="45" r="3.5"/>
+
+  <!-- LED hole (3mm) -->
+  <circle class="hole" cx="24" cy="45" r="1.5"/>
+
+  <!-- Jack holes (6mm) -->
+  <circle class="hole" cx="7.5" cy="95" r="3"/>
+  <circle class="hole" cx="22.5" cy="95" r="3"/>
+
+  <!-- Text labels - WHITE silkscreen -->
+  <text class="text text-medium" x="15" y="12" text-anchor="middle">SubModular</text>
+
+  <text class="text text-large" x="15" y="38" text-anchor="middle" font-weight="bold">SN-L00</text>
+
+  <text class="text text-small" x="15" y="52" text-anchor="middle">BTN</text>
+  <text class="text text-small" x="24" y="52" text-anchor="middle">PWR</text>
+
+  <text class="text text-small" x="7.5" y="105" text-anchor="middle">TRIG</text>
+  <text class="text text-small" x="22.5" y="105" text-anchor="middle">RETURN</text>
+
+  <text class="text text-small" x="15" y="115" text-anchor="middle">LATENCY TESTER</text>
+
+  <!-- Decorative elements -->
+  <!-- Jack nut indicators (circles around jacks) -->
+  <circle class="silkscreen" cx="7.5" cy="95" r="5"/>
+  <circle class="silkscreen" cx="22.5" cy="95" r="5"/>
+
+  <!-- Display frame -->
+  <rect class="silkscreen" x="0.5" y="19.5" width="29" height="11" rx="0.5"/>
+
+  <!-- Horizontal lines for visual separation -->
+  <line class="silkscreen" x1="2" y1="55" x2="28" y2="55"/>
+  <line class="silkscreen" x1="2" y1="85" x2="28" y2="85"/>
+  <line class="silkscreen" x1="2" y1="110" x2="28" y2="110"/>
+
+</svg>