Updated 386EX to V5, with 4-layer PCB and major internal power and digital/signal trace rework.

.gitignore

@@ -76,3 +76,6 @@ asm/*.lst
 # These are backup files generated by rustfmt
 **/*.rs.bk
 
+# macOS .DS_Store files
+*.DS_Store
+

shields/386EX_V4/kicad/Components/Diodes Inc S1A-13-F 50V 1A standard diode/DIOM5226X240N.kicad_mod

@@ -0,0 +1,32 @@
+(module "DIOM5226X240N" (layer F.Cu)
+  (descr "SMA-1")
+  (tags "Schottky Diode")
+  (attr smd)
+  (fp_text reference D** (at 0 0) (layer F.SilkS)
+    (effects (font (size 1.27 1.27) (thickness 0.254)))
+  )
+  (fp_text user %R (at 0 0) (layer F.Fab)
+    (effects (font (size 1.27 1.27) (thickness 0.254)))
+  )
+  (fp_text value "DIOM5226X240N" (at 0 0) (layer F.SilkS) hide
+    (effects (font (size 1.27 1.27) (thickness 0.254)))
+  )
+  (fp_line (start -3.575 -1.71) (end 3.575 -1.71) (layer F.CrtYd) (width 0.05))
+  (fp_line (start 3.575 -1.71) (end 3.575 1.71) (layer F.CrtYd) (width 0.05))
+  (fp_line (start 3.575 1.71) (end -3.575 1.71) (layer F.CrtYd) (width 0.05))
+  (fp_line (start -3.575 1.71) (end -3.575 -1.71) (layer F.CrtYd) (width 0.05))
+  (fp_line (start -2.598 -1.302) (end 2.598 -1.302) (layer F.Fab) (width 0.1))
+  (fp_line (start 2.598 -1.302) (end 2.598 1.302) (layer F.Fab) (width 0.1))
+  (fp_line (start 2.598 1.302) (end -2.598 1.302) (layer F.Fab) (width 0.1))
+  (fp_line (start -2.598 1.302) (end -2.598 -1.302) (layer F.Fab) (width 0.1))
+  (fp_line (start -2.598 -0.528) (end -1.822 -1.302) (layer F.Fab) (width 0.1))
+  (fp_line (start 2.598 -1.302) (end -2.925 -1.302) (layer F.SilkS) (width 0.2))
+  (fp_line (start -2.598 1.302) (end 2.598 1.302) (layer F.SilkS) (width 0.2))
+  (pad 1 smd rect (at -2.15 0 90) (size 1.55 2.35) (layers F.Cu F.Paste F.Mask))
+  (pad 2 smd rect (at 2.15 0 90) (size 1.55 2.35) (layers F.Cu F.Paste F.Mask))
+  (model S1A-13-F.stp
+    (at (xyz 0 0 0))
+    (scale (xyz 1 1 1))
+    (rotate (xyz 0 0 0))
+  )
+)

shields/386EX_V4/kicad/Components/Diodes Inc S1A-13-F 50V 1A standard diode/S1A-13-F.dcm

@@ -0,0 +1,9 @@
+EESchema-DOCLIB  Version 2.0
+#
+$CMP S1A-13-F
+D Diodes Inc S1A-13-F, SMT Switching Diode, 50V 1A, 3000ns, 2-Pin DO-214AC
+K
+F https://componentsearchengine.com/Datasheets/2/S1A-13-F.pdf
+$ENDCMP
+#
+#End Doc Library

shields/386EX_V4/kicad/Components/Diodes Inc S1A-13-F 50V 1A standard diode/S1A-13-F.epw

@@ -0,0 +1,6 @@
+262160
+Message from SamacSys:
+To use this model save to your preferred location and then open within the ECAD Part Wizard tool.
+If you do not yet have a copy of the ECAD Part Wizard tool then please refer to the Instructions provided with this model.
+Source=octopart
+262160/1061990/2.50/2/0/Schottky Diode

shields/386EX_V4/kicad/Components/Diodes Inc S1A-13-F 50V 1A standard diode/S1A-13-F.kicad_sym

@@ -0,0 +1,114 @@
+(kicad_symbol_lib (version 20211014) (generator SamacSys_ECAD_Model)
+  (symbol "S1A-13-F" (in_bom yes) (on_board yes) (pin_names hide)
+    (property "Reference" "D" (at 12.7 8.89 0)
+      (effects (font (size 1.27 1.27)) (justify left top))
+    )
+    (property "Value" "S1A-13-F" (at 12.7 6.35 0)
+      (effects (font (size 1.27 1.27)) (justify left top))
+    )
+    (property "Footprint" "DIOM5226X240N" (at 12.7 -93.65 0)
+      (effects (font (size 1.27 1.27)) (justify left top) hide)
+    )
+    (property "Datasheet" "https://componentsearchengine.com/Datasheets/2/S1A-13-F.pdf" (at 12.7 -193.65 0)
+      (effects (font (size 1.27 1.27)) (justify left top) hide)
+    )
+    (property "ki_description" "Diodes Inc S1A-13-F, SMT Switching Diode, 50V 1A, 3000ns, 2-Pin DO-214AC" (at 12.7 -293.65 0)
+      (effects (font (size 1.27 1.27)) (justify left top) hide)
+    )
+    (property "Height" "2.4" (at 12.7 -393.65 0)
+      (effects (font (size 1.27 1.27)) (justify left top) hide)
+    )
+    (property "Manufacturer_Name" "Diodes Incorporated" (at 12.7 -493.65 0)
+      (effects (font (size 1.27 1.27)) (justify left top) hide)
+    )
+    (property "Manufacturer_Part_Number" "S1A-13-F" (at 12.7 -593.65 0)
+      (effects (font (size 1.27 1.27)) (justify left top) hide)
+    )
+    (property "Mouser Part Number" "621-S1A-F" (at 12.7 -693.65 0)
+      (effects (font (size 1.27 1.27)) (justify left top) hide)
+    )
+    (property "Mouser Price/Stock" "https://www.mouser.co.uk/ProductDetail/Diodes-Incorporated/S1A-13-F?qs=rEOKvymgOgY48KFtcFFe3g%3D%3D" (at 12.7 -793.65 0)
+      (effects (font (size 1.27 1.27)) (justify left top) hide)
+    )
+    (property "Arrow Part Number" "S1A-13-F" (at 12.7 -893.65 0)
+      (effects (font (size 1.27 1.27)) (justify left top) hide)
+    )
+    (property "Arrow Price/Stock" "https://www.arrow.com/en/products/s1a-13-f/diodes-incorporated?region=nac" (at 12.7 -993.65 0)
+      (effects (font (size 1.27 1.27)) (justify left top) hide)
+    )
+    (polyline
+      (pts
+        (xy 7.62 2.54)
+        (xy 7.62 -2.54)
+      )
+      (stroke (width 0.254) (type default))
+      (fill (type none))
+    )
+    (polyline
+      (pts
+        (xy 7.62 2.54)
+        (xy 8.636 2.54)
+      )
+      (stroke (width 0.254) (type default))
+      (fill (type none))
+    )
+    (polyline
+      (pts
+        (xy 8.636 1.524)
+        (xy 8.636 2.54)
+      )
+      (stroke (width 0.254) (type default))
+      (fill (type none))
+    )
+    (polyline
+      (pts
+        (xy 7.62 -2.54)
+        (xy 6.604 -2.54)
+      )
+      (stroke (width 0.254) (type default))
+      (fill (type none))
+    )
+    (polyline
+      (pts
+        (xy 6.604 -1.524)
+        (xy 6.604 -2.54)
+      )
+      (stroke (width 0.254) (type default))
+      (fill (type none))
+    )
+    (polyline
+      (pts
+        (xy 5.08 0)
+        (xy 7.62 0)
+      )
+      (stroke (width 0.254) (type default))
+      (fill (type none))
+    )
+    (polyline
+      (pts
+        (xy 12.7 0)
+        (xy 15.24 0)
+      )
+      (stroke (width 0.254) (type default))
+      (fill (type none))
+    )
+    (polyline
+      (pts
+        (xy 7.62 0)
+        (xy 12.7 2.54)
+        (xy 12.7 -2.54)
+        (xy 7.62 0)
+      )
+      (stroke (width 0.254) (type default))
+      (fill (type outline))
+    )
+    (pin passive line (at 2.54 0 0) (length 2.54)
+      (name "K" (effects (font (size 1.27 1.27))))
+      (number "1" (effects (font (size 1.27 1.27))))
+    )
+    (pin passive line (at 17.78 0 180) (length 2.54)
+      (name "A" (effects (font (size 1.27 1.27))))
+      (number "2" (effects (font (size 1.27 1.27))))
+    )
+  )
+)

shields/386EX_V4/kicad/Components/Diodes Inc S1A-13-F 50V 1A standard diode/S1A-13-F.lib

@@ -0,0 +1,30 @@
+EESchema-LIBRARY Version 2.3
+#encoding utf-8
+#SamacSys ECAD Model S1A-13-F
+#/262160/1061990/2.50/2/0/Schottky Diode
+DEF S1A-13-F D 0 30 Y Y 1 F N
+F0 "D" 500 350 50 H V L CNN
+F1 "S1A-13-F" 500 250 50 H V L CNN
+F2 "DIOM5226X240N" 500 150 50 H I L CNN
+F3 "https://componentsearchengine.com/Datasheets/2/S1A-13-F.pdf" 500 50 50 H I L CNN
+F4 "Diodes Inc S1A-13-F, SMT Switching Diode, 50V 1A, 3000ns, 2-Pin DO-214AC" 500 -50 50 H I L CNN "Description"
+F5 "2.4" 500 -150 50 H I L CNN "Height"
+F6 "Diodes Incorporated" 500 -250 50 H I L CNN "Manufacturer_Name"
+F7 "S1A-13-F" 500 -350 50 H I L CNN "Manufacturer_Part_Number"
+F8 "621-S1A-F" 500 -450 50 H I L CNN "Mouser Part Number"
+F9 "https://www.mouser.co.uk/ProductDetail/Diodes-Incorporated/S1A-13-F?qs=rEOKvymgOgY48KFtcFFe3g%3D%3D" 500 -550 50 H I L CNN "Mouser Price/Stock"
+F10 "S1A-13-F" 500 -650 50 H I L CNN "Arrow Part Number"
+F11 "https://www.arrow.com/en/products/s1a-13-f/diodes-incorporated?region=nac" 500 -750 50 H I L CNN "Arrow Price/Stock"
+DRAW
+X ~ 1 100 0 100 R 50 50 0 0 P
+X ~ 2 700 0 100 L 50 50 0 0 P
+P 2 0 1 6 300 100 300 -100 N
+P 3 0 1 6 300 100 340 100 340 60 N
+P 3 0 1 6 300 -100 260 -100 260 -60 N
+P 2 0 1 6 200 0 300 0 N
+P 2 0 1 6 500 0 600 0 N
+P 4 0 1 10 300 0 500 100 500 -100 300 0 F
+ENDDRAW
+ENDDEF
+#
+#End Library