diff --git a/hardware/kicad/SN-L00.kicad_pcb b/hardware/kicad/SN-L00.kicad_pcb
index aa52ce8..a7c4c8e 100644
--- a/hardware/kicad/SN-L00.kicad_pcb
+++ b/hardware/kicad/SN-L00.kicad_pcb
@@ -34,15 +34,6 @@
     (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)
@@ -51,7 +42,7 @@
       (layerselection 0x00010fc_ffffffff)
       (plot_on_all_layers_selection 0x0000000_00000000)
       (disableapertmacros no)
-      (usegerberextensions no)
+      (usegerberextensions yes)
       (usegerberattributes yes)
       (usegerberadvancedattributes yes)
       (creategerberjobfile yes)
@@ -82,9 +73,11 @@
       (mirror no)
       (drillshape 1)
       (scaleselection 1)
-      (outputdirectory "")
+      (outputdirectory "../manufacturing/gerbers/")
     )
   )
+
+  ;; Net definitions
   (net 0 "")
   (net 1 "GND")
   (net 2 "+12V")
@@ -94,98 +87,506 @@
   (net 6 "TRIG_OUT")
   (net 7 "RETURN_IN")
   (net 8 "BTN")
+  (net 9 "TRIG_BUF")
+  (net 10 "RET_DIV")
+  (net 11 "RET_BUF")
 
-  ;; Board outline - 6HP Eurorack PCB
-  ;; Width: 28mm (6HP = 30mm panel, PCB slightly narrower)
-  ;; Height: 100mm (fits behind panel with clearance)
+  ;; Net classes
+  (net_class "Default" ""
+    (clearance 0.2)
+    (trace_width 0.25)
+    (via_dia 0.6)
+    (via_drill 0.3)
+    (uvia_dia 0.3)
+    (uvia_drill 0.1)
+  )
+  (net_class "Power" ""
+    (clearance 0.3)
+    (trace_width 0.5)
+    (via_dia 0.8)
+    (via_drill 0.4)
+    (uvia_dia 0.3)
+    (uvia_drill 0.1)
+    (add_net "+12V")
+    (add_net "+3.3V")
+    (add_net "GND")
+  )
+
+  ;; Board outline - 6HP Eurorack PCB (28mm x 100mm)
   (gr_rect
     (start 0 0)
     (end 28 100)
-    (stroke
-      (width 0.15)
-      (type solid)
-    )
+    (stroke (width 0.15) (type solid))
     (fill none)
     (layer "Edge.Cuts")
     (uuid "board-outline")
   )
 
-  ;; Mounting holes (M3, 3.2mm)
-  ;; Top mounting hole
+  ;; ============================================
+  ;; MOUNTING HOLES
+  ;; ============================================
+
+  ;; Top mounting hole (MH1)
   (footprint "MountingHole:MountingHole_3.2mm_M3"
     (layer "F.Cu")
-    (uuid "mh1")
+    (uuid "00000000-0000-0000-0000-000000000001")
     (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")
-    )
+    (property "Reference" "MH1" (at 0 -3 0) (layer "F.SilkS") (effects (font (size 0.8 0.8) (thickness 0.15))))
+    (property "Value" "MountingHole" (at 0 3 0) (layer "F.Fab") (effects (font (size 0.8 0.8) (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
+  ;; Bottom mounting hole (MH2)
   (footprint "MountingHole:MountingHole_3.2mm_M3"
     (layer "F.Cu")
-    (uuid "mh2")
+    (uuid "00000000-0000-0000-0000-000000000002")
     (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")
-    )
+    (property "Reference" "MH2" (at 0 -3 0) (layer "F.SilkS") (effects (font (size 0.8 0.8) (thickness 0.15))))
+    (property "Value" "MountingHole" (at 0 3 0) (layer "F.Fab") (effects (font (size 0.8 0.8) (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)
+  ;; ============================================
+  ;; MODULES (Hand-solder)
+  ;; ============================================
+
+  ;; OLED 128x32 I2C Module (MOD2) - 4-pin header
+  (footprint "SN-L00:OLED_128x32_I2C"
+    (layer "F.Cu")
+    (uuid "00000000-0000-0000-0000-000000000010")
+    (at 14 17.5)
+    (property "Reference" "MOD2" (at 0 -7 0) (layer "F.SilkS") (effects (font (size 1 1) (thickness 0.15))))
+    (property "Value" "OLED_128x32" (at 0 7 0) (layer "F.Fab") (effects (font (size 1 1) (thickness 0.15))))
+    (fp_line (start -14 -5) (end 14 -5) (stroke (width 0.12) (type solid)) (layer "F.SilkS"))
+    (fp_line (start 14 -5) (end 14 5) (stroke (width 0.12) (type solid)) (layer "F.SilkS"))
+    (fp_line (start 14 5) (end -14 5) (stroke (width 0.12) (type solid)) (layer "F.SilkS"))
+    (fp_line (start -14 5) (end -14 -5) (stroke (width 0.12) (type solid)) (layer "F.SilkS"))
+    (pad "1" thru_hole circle (at -3.81 0) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask") (net 1 "GND"))
+    (pad "2" thru_hole circle (at -1.27 0) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask") (net 3 "+3.3V"))
+    (pad "3" thru_hole circle (at 1.27 0) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask") (net 5 "SCL"))
+    (pad "4" thru_hole circle (at 3.81 0) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask") (net 4 "SDA"))
+  )
+
+  ;; RP2040-Zero Module (MOD1) - 2x9 header
+  (footprint "SN-L00:RP2040-Zero"
+    (layer "F.Cu")
+    (uuid "00000000-0000-0000-0000-000000000011")
+    (at 14 46.5)
+    (property "Reference" "MOD1" (at 0 -13 0) (layer "F.SilkS") (effects (font (size 1 1) (thickness 0.15))))
+    (property "Value" "RP2040-Zero" (at 0 13 0) (layer "F.Fab") (effects (font (size 1 1) (thickness 0.15))))
+    (fp_line (start -9.5 -11.5) (end 9.5 -11.5) (stroke (width 0.12) (type solid)) (layer "F.SilkS"))
+    (fp_line (start 9.5 -11.5) (end 9.5 11.5) (stroke (width 0.12) (type solid)) (layer "F.SilkS"))
+    (fp_line (start 9.5 11.5) (end -9.5 11.5) (stroke (width 0.12) (type solid)) (layer "F.SilkS"))
+    (fp_line (start -9.5 11.5) (end -9.5 -11.5) (stroke (width 0.12) (type solid)) (layer "F.SilkS"))
+    ;; Left column (pins 1-9)
+    (pad "1" thru_hole rect (at -7.62 -10.16) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask"))
+    (pad "2" thru_hole circle (at -7.62 -7.62) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask") (net 1 "GND"))
+    (pad "3" thru_hole circle (at -7.62 -5.08) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask") (net 3 "+3.3V"))
+    (pad "4" thru_hole circle (at -7.62 -2.54) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask"))
+    (pad "5" thru_hole circle (at -7.62 0) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask"))
+    (pad "6" thru_hole circle (at -7.62 2.54) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask") (net 6 "TRIG_OUT"))
+    (pad "7" thru_hole circle (at -7.62 5.08) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask") (net 7 "RETURN_IN"))
+    (pad "8" thru_hole circle (at -7.62 7.62) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask") (net 8 "BTN"))
+    (pad "9" thru_hole circle (at -7.62 10.16) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask"))
+    ;; Right column (pins 10-18)
+    (pad "10" thru_hole circle (at 7.62 -10.16) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask") (net 3 "+3.3V"))
+    (pad "11" thru_hole circle (at 7.62 -7.62) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask") (net 1 "GND"))
+    (pad "12" thru_hole circle (at 7.62 -5.08) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask") (net 4 "SDA"))
+    (pad "13" thru_hole circle (at 7.62 -2.54) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask") (net 5 "SCL"))
+    (pad "14" thru_hole circle (at 7.62 0) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask"))
+    (pad "15" thru_hole circle (at 7.62 2.54) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask"))
+    (pad "16" thru_hole circle (at 7.62 5.08) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask"))
+    (pad "17" thru_hole circle (at 7.62 7.62) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask"))
+    (pad "18" thru_hole circle (at 7.62 10.16) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask"))
+  )
+
+  ;; ============================================
+  ;; USER INTERFACE
+  ;; ============================================
+
+  ;; SW1 - Tactile Switch 6x6mm
+  (footprint "Button_Switch_SMD:SW_Push_1P1T_NO_6x6mm_H9.5mm"
+    (layer "F.Cu")
+    (uuid "00000000-0000-0000-0000-000000000020")
+    (at 14 31.5)
+    (property "Reference" "SW1" (at 0 -5 0) (layer "F.SilkS") (effects (font (size 0.8 0.8) (thickness 0.15))))
+    (property "Value" "6x6mm" (at 0 5 0) (layer "F.Fab") (effects (font (size 0.8 0.8) (thickness 0.15))))
+    (fp_line (start -3 -3) (end 3 -3) (stroke (width 0.12) (type solid)) (layer "F.SilkS"))
+    (fp_line (start 3 -3) (end 3 3) (stroke (width 0.12) (type solid)) (layer "F.SilkS"))
+    (fp_line (start 3 3) (end -3 3) (stroke (width 0.12) (type solid)) (layer "F.SilkS"))
+    (fp_line (start -3 3) (end -3 -3) (stroke (width 0.12) (type solid)) (layer "F.SilkS"))
+    (pad "1" smd rect (at -3.85 2.25) (size 1.6 1.4) (layers "F.Cu" "F.Paste" "F.Mask") (net 8 "BTN"))
+    (pad "2" smd rect (at 3.85 2.25) (size 1.6 1.4) (layers "F.Cu" "F.Paste" "F.Mask") (net 1 "GND"))
+    (pad "3" smd rect (at -3.85 -2.25) (size 1.6 1.4) (layers "F.Cu" "F.Paste" "F.Mask") (net 8 "BTN"))
+    (pad "4" smd rect (at 3.85 -2.25) (size 1.6 1.4) (layers "F.Cu" "F.Paste" "F.Mask") (net 1 "GND"))
+  )
+
+  ;; R1 - Button pullup 10K (0603)
+  (footprint "Resistor_SMD:R_0603_1608Metric"
+    (layer "F.Cu")
+    (uuid "00000000-0000-0000-0000-000000000021")
+    (at 10 35)
+    (property "Reference" "R1" (at 0 -1.5 0) (layer "F.SilkS") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (property "Value" "10K" (at 0 1.5 0) (layer "F.Fab") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (pad "1" smd roundrect (at -0.825 0) (size 0.8 0.95) (layers "F.Cu" "F.Paste" "F.Mask") (roundrect_rratio 0.25) (net 3 "+3.3V"))
+    (pad "2" smd roundrect (at 0.825 0) (size 0.8 0.95) (layers "F.Cu" "F.Paste" "F.Mask") (roundrect_rratio 0.25) (net 8 "BTN"))
+  )
+
+  ;; D2 - Power LED Green (0603)
+  (footprint "LED_SMD:LED_0603_1608Metric"
+    (layer "F.Cu")
+    (uuid "00000000-0000-0000-0000-000000000022")
+    (at 24 31.5 90)
+    (property "Reference" "D2" (at 0 -1.5 0) (layer "F.SilkS") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (property "Value" "Green" (at 0 1.5 0) (layer "F.Fab") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (pad "1" smd roundrect (at -0.75 0) (size 0.65 0.65) (layers "F.Cu" "F.Paste" "F.Mask") (roundrect_rratio 0.25))
+    (pad "2" smd roundrect (at 0.75 0) (size 0.65 0.65) (layers "F.Cu" "F.Paste" "F.Mask") (roundrect_rratio 0.25))
+  )
+
+  ;; R2 - LED resistor 1K (0603)
+  (footprint "Resistor_SMD:R_0603_1608Metric"
+    (layer "F.Cu")
+    (uuid "00000000-0000-0000-0000-000000000023")
+    (at 24 36 90)
+    (property "Reference" "R2" (at 0 -1.5 0) (layer "F.SilkS") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (property "Value" "1K" (at 0 1.5 0) (layer "F.Fab") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (pad "1" smd roundrect (at -0.825 0) (size 0.8 0.95) (layers "F.Cu" "F.Paste" "F.Mask") (roundrect_rratio 0.25) (net 3 "+3.3V"))
+    (pad "2" smd roundrect (at 0.825 0) (size 0.8 0.95) (layers "F.Cu" "F.Paste" "F.Mask") (roundrect_rratio 0.25))
+  )
+
+  ;; ============================================
+  ;; CONNECTORS
+  ;; ============================================
+
+  ;; J1 - Eurorack Power Header 2x5
+  (footprint "Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical"
+    (layer "F.Cu")
+    (uuid "00000000-0000-0000-0000-000000000030")
+    (at 14 92)
+    (property "Reference" "J1" (at 0 -7 0) (layer "F.SilkS") (effects (font (size 1 1) (thickness 0.15))))
+    (property "Value" "Eurorack_2x5" (at 0 7 0) (layer "F.Fab") (effects (font (size 1 1) (thickness 0.15))))
+    (fp_line (start -6.35 -5.08) (end 6.35 -5.08) (stroke (width 0.12) (type solid)) (layer "F.SilkS"))
+    (fp_line (start 6.35 -5.08) (end 6.35 5.08) (stroke (width 0.12) (type solid)) (layer "F.SilkS"))
+    (fp_line (start 6.35 5.08) (end -6.35 5.08) (stroke (width 0.12) (type solid)) (layer "F.SilkS"))
+    (fp_line (start -6.35 5.08) (end -6.35 -5.08) (stroke (width 0.12) (type solid)) (layer "F.SilkS"))
+    ;; Row 1 (top)
+    (pad "1" thru_hole rect (at -5.08 -2.54) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask") (net 1 "GND"))
+    (pad "2" thru_hole circle (at -5.08 2.54) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask") (net 1 "GND"))
+    (pad "3" thru_hole circle (at -2.54 -2.54) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask") (net 1 "GND"))
+    (pad "4" thru_hole circle (at -2.54 2.54) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask") (net 2 "+12V"))
+    (pad "5" thru_hole circle (at 0 -2.54) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask") (net 1 "GND"))
+    (pad "6" thru_hole circle (at 0 2.54) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask") (net 2 "+12V"))
+    (pad "7" thru_hole circle (at 2.54 -2.54) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask") (net 1 "GND"))
+    (pad "8" thru_hole circle (at 2.54 2.54) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask"))
+    (pad "9" thru_hole circle (at 5.08 -2.54) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask") (net 1 "GND"))
+    (pad "10" thru_hole circle (at 5.08 2.54) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask"))
+  )
+
+  ;; J2 - Thonkiconn TRIG jack
+  (footprint "Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles"
+    (layer "F.Cu")
+    (uuid "00000000-0000-0000-0000-000000000031")
+    (at 7 83)
+    (property "Reference" "J2" (at 0 -6 0) (layer "F.SilkS") (effects (font (size 1 1) (thickness 0.15))))
+    (property "Value" "TRIG" (at 0 6 0) (layer "F.Fab") (effects (font (size 1 1) (thickness 0.15))))
+    (fp_circle (center 0 0) (end 4 0) (stroke (width 0.12) (type solid)) (fill none) (layer "F.SilkS"))
+    (pad "T" thru_hole circle (at 0 0) (size 2.8 2.8) (drill 2.0) (layers "*.Cu" "*.Mask") (net 9 "TRIG_BUF"))
+    (pad "S" thru_hole circle (at -3 3) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask") (net 1 "GND"))
+    (pad "TN" thru_hole circle (at 3 3) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask"))
+  )
+
+  ;; J3 - Thonkiconn RETURN jack
+  (footprint "Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles"
+    (layer "F.Cu")
+    (uuid "00000000-0000-0000-0000-000000000032")
+    (at 21 83)
+    (property "Reference" "J3" (at 0 -6 0) (layer "F.SilkS") (effects (font (size 1 1) (thickness 0.15))))
+    (property "Value" "RETURN" (at 0 6 0) (layer "F.Fab") (effects (font (size 1 1) (thickness 0.15))))
+    (fp_circle (center 0 0) (end 4 0) (stroke (width 0.12) (type solid)) (fill none) (layer "F.SilkS"))
+    (pad "T" thru_hole circle (at 0 0) (size 2.8 2.8) (drill 2.0) (layers "*.Cu" "*.Mask") (net 10 "RET_DIV"))
+    (pad "S" thru_hole circle (at -3 3) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask") (net 1 "GND"))
+    (pad "TN" thru_hole circle (at 3 3) (size 1.7 1.7) (drill 1.0) (layers "*.Cu" "*.Mask"))
+  )
+
+  ;; ============================================
+  ;; POWER SECTION (Back side)
+  ;; ============================================
+
+  ;; D1 - SS14 Schottky diode (SMA)
+  (footprint "Diode_SMD:D_SMA"
+    (layer "B.Cu")
+    (uuid "00000000-0000-0000-0000-000000000040")
+    (at 7 65)
+    (property "Reference" "D1" (at 0 -2.5 0) (layer "B.SilkS") (effects (font (size 0.8 0.8) (thickness 0.15)) (justify mirror)))
+    (property "Value" "SS14" (at 0 2.5 0) (layer "B.Fab") (effects (font (size 0.8 0.8) (thickness 0.15)) (justify mirror)))
+    (pad "1" smd rect (at -2.1 0) (size 1.6 1.4) (layers "B.Cu" "B.Paste" "B.Mask") (net 2 "+12V"))
+    (pad "2" smd rect (at 2.1 0) (size 1.6 1.4) (layers "B.Cu" "B.Paste" "B.Mask"))
+  )
+
+  ;; U1 - AMS1117-3.3 LDO (SOT-223)
+  (footprint "Package_TO_SOT_SMD:SOT-223-3_TabPin2"
+    (layer "B.Cu")
+    (uuid "00000000-0000-0000-0000-000000000041")
+    (at 14 65)
+    (property "Reference" "U1" (at 0 -4 0) (layer "B.SilkS") (effects (font (size 0.8 0.8) (thickness 0.15)) (justify mirror)))
+    (property "Value" "AMS1117-3.3" (at 0 4 0) (layer "B.Fab") (effects (font (size 0.8 0.8) (thickness 0.15)) (justify mirror)))
+    (fp_line (start -3.4 -1.6) (end 3.4 -1.6) (stroke (width 0.12) (type solid)) (layer "B.SilkS"))
+    (fp_line (start 3.4 -1.6) (end 3.4 1.6) (stroke (width 0.12) (type solid)) (layer "B.SilkS"))
+    (fp_line (start 3.4 1.6) (end -3.4 1.6) (stroke (width 0.12) (type solid)) (layer "B.SilkS"))
+    (fp_line (start -3.4 1.6) (end -3.4 -1.6) (stroke (width 0.12) (type solid)) (layer "B.SilkS"))
+    (pad "1" smd rect (at -2.3 3.2) (size 1 1.5) (layers "B.Cu" "B.Paste" "B.Mask") (net 1 "GND"))
+    (pad "2" smd rect (at 0 3.2) (size 1 1.5) (layers "B.Cu" "B.Paste" "B.Mask") (net 3 "+3.3V"))
+    (pad "3" smd rect (at 2.3 3.2) (size 1 1.5) (layers "B.Cu" "B.Paste" "B.Mask"))
+    (pad "2" smd rect (at 0 -3.2) (size 3.5 2) (layers "B.Cu" "B.Paste" "B.Mask") (net 3 "+3.3V"))
+  )
+
+  ;; C1 - 10uF input cap (0805)
+  (footprint "Capacitor_SMD:C_0805_2012Metric"
+    (layer "F.Cu")
+    (uuid "00000000-0000-0000-0000-000000000042")
+    (at 10 60)
+    (property "Reference" "C1" (at 0 -1.5 0) (layer "F.SilkS") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (property "Value" "10uF" (at 0 1.5 0) (layer "F.Fab") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (pad "1" smd roundrect (at -1 0) (size 1 1.45) (layers "F.Cu" "F.Paste" "F.Mask") (roundrect_rratio 0.25))
+    (pad "2" smd roundrect (at 1 0) (size 1 1.45) (layers "F.Cu" "F.Paste" "F.Mask") (roundrect_rratio 0.25) (net 1 "GND"))
+  )
+
+  ;; C2 - 10uF output cap (0805)
+  (footprint "Capacitor_SMD:C_0805_2012Metric"
+    (layer "F.Cu")
+    (uuid "00000000-0000-0000-0000-000000000043")
+    (at 18 60)
+    (property "Reference" "C2" (at 0 -1.5 0) (layer "F.SilkS") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (property "Value" "10uF" (at 0 1.5 0) (layer "F.Fab") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (pad "1" smd roundrect (at -1 0) (size 1 1.45) (layers "F.Cu" "F.Paste" "F.Mask") (roundrect_rratio 0.25) (net 3 "+3.3V"))
+    (pad "2" smd roundrect (at 1 0) (size 1 1.45) (layers "F.Cu" "F.Paste" "F.Mask") (roundrect_rratio 0.25) (net 1 "GND"))
+  )
+
+  ;; C3 - 100nF output cap (0603)
+  (footprint "Capacitor_SMD:C_0603_1608Metric"
+    (layer "F.Cu")
+    (uuid "00000000-0000-0000-0000-000000000044")
+    (at 21 60)
+    (property "Reference" "C3" (at 0 -1.5 0) (layer "F.SilkS") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (property "Value" "100nF" (at 0 1.5 0) (layer "F.Fab") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (pad "1" smd roundrect (at -0.775 0) (size 0.9 0.95) (layers "F.Cu" "F.Paste" "F.Mask") (roundrect_rratio 0.25) (net 3 "+3.3V"))
+    (pad "2" smd roundrect (at 0.775 0) (size 0.9 0.95) (layers "F.Cu" "F.Paste" "F.Mask") (roundrect_rratio 0.25) (net 1 "GND"))
+  )
+
+  ;; ============================================
+  ;; TRIGGER OUTPUT CIRCUIT
+  ;; ============================================
+
+  ;; U2 - 74LVC1G17 Schmitt trigger (SOT-23-5)
+  (footprint "Package_TO_SOT_SMD:SOT-23-5"
+    (layer "F.Cu")
+    (uuid "00000000-0000-0000-0000-000000000050")
+    (at 7 72)
+    (property "Reference" "U2" (at 0 -2.5 0) (layer "F.SilkS") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (property "Value" "74LVC1G17" (at 0 2.5 0) (layer "F.Fab") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (pad "1" smd rect (at -1.1 0.95) (size 0.6 1.1) (layers "F.Cu" "F.Paste" "F.Mask") (net 6 "TRIG_OUT"))
+    (pad "2" smd rect (at -1.1 -0.95) (size 0.6 1.1) (layers "F.Cu" "F.Paste" "F.Mask") (net 1 "GND"))
+    (pad "3" smd rect (at 1.1 -0.95) (size 0.6 1.1) (layers "F.Cu" "F.Paste" "F.Mask"))
+    (pad "4" smd rect (at 1.1 0) (size 0.6 1.1) (layers "F.Cu" "F.Paste" "F.Mask") (net 9 "TRIG_BUF"))
+    (pad "5" smd rect (at 1.1 0.95) (size 0.6 1.1) (layers "F.Cu" "F.Paste" "F.Mask") (net 3 "+3.3V"))
+  )
+
+  ;; C4 - 100nF decoupling for U2 (0603)
+  (footprint "Capacitor_SMD:C_0603_1608Metric"
+    (layer "F.Cu")
+    (uuid "00000000-0000-0000-0000-000000000051")
+    (at 7 68)
+    (property "Reference" "C4" (at 0 -1.5 0) (layer "F.SilkS") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (property "Value" "100nF" (at 0 1.5 0) (layer "F.Fab") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (pad "1" smd roundrect (at -0.775 0) (size 0.9 0.95) (layers "F.Cu" "F.Paste" "F.Mask") (roundrect_rratio 0.25) (net 3 "+3.3V"))
+    (pad "2" smd roundrect (at 0.775 0) (size 0.9 0.95) (layers "F.Cu" "F.Paste" "F.Mask") (roundrect_rratio 0.25) (net 1 "GND"))
+  )
+
+  ;; R3 - 100R trigger series resistor (0603)
+  (footprint "Resistor_SMD:R_0603_1608Metric"
+    (layer "F.Cu")
+    (uuid "00000000-0000-0000-0000-000000000052")
+    (at 7 76 90)
+    (property "Reference" "R3" (at 0 -1.5 0) (layer "F.SilkS") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (property "Value" "100R" (at 0 1.5 0) (layer "F.Fab") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (pad "1" smd roundrect (at -0.825 0) (size 0.8 0.95) (layers "F.Cu" "F.Paste" "F.Mask") (roundrect_rratio 0.25) (net 9 "TRIG_BUF"))
+    (pad "2" smd roundrect (at 0.825 0) (size 0.8 0.95) (layers "F.Cu" "F.Paste" "F.Mask") (roundrect_rratio 0.25))
+  )
+
+  ;; ============================================
+  ;; RETURN INPUT CIRCUIT
+  ;; ============================================
+
+  ;; U3 - MCP6001 op-amp (SOT-23-5)
+  (footprint "Package_TO_SOT_SMD:SOT-23-5"
+    (layer "F.Cu")
+    (uuid "00000000-0000-0000-0000-000000000060")
+    (at 21 72)
+    (property "Reference" "U3" (at 0 -2.5 0) (layer "F.SilkS") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (property "Value" "MCP6001" (at 0 2.5 0) (layer "F.Fab") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (pad "1" smd rect (at -1.1 0.95) (size 0.6 1.1) (layers "F.Cu" "F.Paste" "F.Mask") (net 11 "RET_BUF"))
+    (pad "2" smd rect (at -1.1 -0.95) (size 0.6 1.1) (layers "F.Cu" "F.Paste" "F.Mask") (net 1 "GND"))
+    (pad "3" smd rect (at 1.1 -0.95) (size 0.6 1.1) (layers "F.Cu" "F.Paste" "F.Mask") (net 11 "RET_BUF"))
+    (pad "4" smd rect (at 1.1 0) (size 0.6 1.1) (layers "F.Cu" "F.Paste" "F.Mask") (net 10 "RET_DIV"))
+    (pad "5" smd rect (at 1.1 0.95) (size 0.6 1.1) (layers "F.Cu" "F.Paste" "F.Mask") (net 3 "+3.3V"))
+  )
+
+  ;; C5 - 100nF decoupling for U3 (0603)
+  (footprint "Capacitor_SMD:C_0603_1608Metric"
+    (layer "F.Cu")
+    (uuid "00000000-0000-0000-0000-000000000061")
+    (at 21 68)
+    (property "Reference" "C5" (at 0 -1.5 0) (layer "F.SilkS") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (property "Value" "100nF" (at 0 1.5 0) (layer "F.Fab") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (pad "1" smd roundrect (at -0.775 0) (size 0.9 0.95) (layers "F.Cu" "F.Paste" "F.Mask") (roundrect_rratio 0.25) (net 3 "+3.3V"))
+    (pad "2" smd roundrect (at 0.775 0) (size 0.9 0.95) (layers "F.Cu" "F.Paste" "F.Mask") (roundrect_rratio 0.25) (net 1 "GND"))
+  )
+
+  ;; R4 - 10K input resistor (0603)
+  (footprint "Resistor_SMD:R_0603_1608Metric"
+    (layer "F.Cu")
+    (uuid "00000000-0000-0000-0000-000000000062")
+    (at 21 76 90)
+    (property "Reference" "R4" (at 0 -1.5 0) (layer "F.SilkS") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (property "Value" "10K" (at 0 1.5 0) (layer "F.Fab") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (pad "1" smd roundrect (at -0.825 0) (size 0.8 0.95) (layers "F.Cu" "F.Paste" "F.Mask") (roundrect_rratio 0.25) (net 10 "RET_DIV"))
+    (pad "2" smd roundrect (at 0.825 0) (size 0.8 0.95) (layers "F.Cu" "F.Paste" "F.Mask") (roundrect_rratio 0.25))
+  )
+
+  ;; R5 - 10K voltage divider top (0603)
+  (footprint "Resistor_SMD:R_0603_1608Metric"
+    (layer "F.Cu")
+    (uuid "00000000-0000-0000-0000-000000000063")
+    (at 18 76 90)
+    (property "Reference" "R5" (at 0 -1.5 0) (layer "F.SilkS") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (property "Value" "10K" (at 0 1.5 0) (layer "F.Fab") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (pad "1" smd roundrect (at -0.825 0) (size 0.8 0.95) (layers "F.Cu" "F.Paste" "F.Mask") (roundrect_rratio 0.25))
+    (pad "2" smd roundrect (at 0.825 0) (size 0.8 0.95) (layers "F.Cu" "F.Paste" "F.Mask") (roundrect_rratio 0.25) (net 10 "RET_DIV"))
+  )
+
+  ;; R6 - 22K voltage divider bottom (0603)
+  (footprint "Resistor_SMD:R_0603_1608Metric"
+    (layer "F.Cu")
+    (uuid "00000000-0000-0000-0000-000000000064")
+    (at 18 72 90)
+    (property "Reference" "R6" (at 0 -1.5 0) (layer "F.SilkS") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (property "Value" "22K" (at 0 1.5 0) (layer "F.Fab") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (pad "1" smd roundrect (at -0.825 0) (size 0.8 0.95) (layers "F.Cu" "F.Paste" "F.Mask") (roundrect_rratio 0.25) (net 10 "RET_DIV"))
+    (pad "2" smd roundrect (at 0.825 0) (size 0.8 0.95) (layers "F.Cu" "F.Paste" "F.Mask") (roundrect_rratio 0.25) (net 1 "GND"))
+  )
+
+  ;; D3 - BAT54 clamp diode to GND (SOD-323)
+  (footprint "Diode_SMD:D_SOD-323"
+    (layer "F.Cu")
+    (uuid "00000000-0000-0000-0000-000000000065")
+    (at 24 70 90)
+    (property "Reference" "D3" (at 0 -1.5 0) (layer "F.SilkS") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (property "Value" "BAT54" (at 0 1.5 0) (layer "F.Fab") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (pad "1" smd rect (at -1.15 0) (size 0.6 0.6) (layers "F.Cu" "F.Paste" "F.Mask") (net 10 "RET_DIV"))
+    (pad "2" smd rect (at 1.15 0) (size 0.6 0.6) (layers "F.Cu" "F.Paste" "F.Mask") (net 1 "GND"))
+  )
+
+  ;; D4 - BAT54 clamp diode to 3.3V (SOD-323)
+  (footprint "Diode_SMD:D_SOD-323"
+    (layer "F.Cu")
+    (uuid "00000000-0000-0000-0000-000000000066")
+    (at 24 74 90)
+    (property "Reference" "D4" (at 0 -1.5 0) (layer "F.SilkS") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (property "Value" "BAT54" (at 0 1.5 0) (layer "F.Fab") (effects (font (size 0.6 0.6) (thickness 0.12))))
+    (pad "1" smd rect (at -1.15 0) (size 0.6 0.6) (layers "F.Cu" "F.Paste" "F.Mask") (net 3 "+3.3V"))
+    (pad "2" smd rect (at 1.15 0) (size 0.6 0.6) (layers "F.Cu" "F.Paste" "F.Mask") (net 10 "RET_DIV"))
+  )
+
+  ;; ============================================
+  ;; SILKSCREEN LABELS
+  ;; ============================================
 
-  ;; 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)
-    )
+    (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)
+    (effects (font (size 0.8 0.8) (thickness 0.15)) (justify center))
+  )
+
+  (gr_text "TRIG"
+    (at 7 77 0)
+    (layer "F.SilkS")
+    (uuid "trig-label")
+    (effects (font (size 0.8 0.8) (thickness 0.15)) (justify center))
+  )
+
+  (gr_text "RETURN"
+    (at 21 77 0)
+    (layer "F.SilkS")
+    (uuid "return-label")
+    (effects (font (size 0.8 0.8) (thickness 0.15)) (justify center))
+  )
+
+  (gr_text "SN-L00"
+    (at 14 50 0)
+    (layer "B.SilkS")
+    (uuid "back-title")
+    (effects (font (size 1.5 1.5) (thickness 0.2)) (justify center mirror))
+  )
+
+  (gr_text "git.sub-net.at/submodular/SN-L00"
+    (at 14 55 0)
+    (layer "B.SilkS")
+    (uuid "back-url")
+    (effects (font (size 0.6 0.6) (thickness 0.12)) (justify center mirror))
+  )
+
+  ;; ============================================
+  ;; GROUND ZONE (Back copper)
+  ;; ============================================
+
+  (zone
+    (net 1)
+    (net_name "GND")
+    (layer "B.Cu")
+    (uuid "gnd-zone-back")
+    (hatch edge 0.5)
+    (connect_pads (clearance 0.3))
+    (min_thickness 0.25)
+    (fill yes (thermal_gap 0.5) (thermal_bridge_width 0.5))
+    (polygon
+      (pts
+        (xy 0 0)
+        (xy 28 0)
+        (xy 28 100)
+        (xy 0 100)
+      )
     )
   )
 
-  ;; Ground plane zones would be added here
-  ;; (zone ...)
+  ;; ============================================
+  ;; GROUND ZONE (Front copper - partial)
+  ;; ============================================
+
+  (zone
+    (net 1)
+    (net_name "GND")
+    (layer "F.Cu")
+    (uuid "gnd-zone-front")
+    (hatch edge 0.5)
+    (connect_pads (clearance 0.3))
+    (min_thickness 0.25)
+    (fill yes (thermal_gap 0.5) (thermal_bridge_width 0.5))
+    (polygon
+      (pts
+        (xy 0 0)
+        (xy 28 0)
+        (xy 28 100)
+        (xy 0 100)
+      )
+    )
+  )
 
 )