big update

* drawn contacts
* done board outline in cad
* reverted to high-side monitoring with ad-hoc ic

hw/symbols/custom_library.kicad_sym

@@ -437,6 +437,186 @@
 		)
 		(embedded_fonts no)
 	)
+	(symbol "TPA191Ax"
+		(exclude_from_sim no)
+		(in_bom yes)
+		(on_board yes)
+		(property "Reference" "U"
+			(at 2.794 -7.62 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+			)
+		)
+		(property "Value" "TPA191Ax"
+			(at 0 0 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+			)
+		)
+		(property "Footprint" "Package_TO_SOT_SMD:SOT-363_SC-70-6"
+			(at 0 0 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+				(hide yes)
+			)
+		)
+		(property "Datasheet" "https://static.3peak.com/res/doc/ds/Datasheet_TPA191.pdf"
+			(at 0 0 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+				(hide yes)
+			)
+		)
+		(property "Description" "Zero-Drift, Bi-Directional Current Sense Amplifier"
+			(at 0 0 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+				(hide yes)
+			)
+		)
+		(property "ki_keywords" "Zero-Drift Bi-Directional Current Sense Amplifier"
+			(at 0 0 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+				(hide yes)
+			)
+		)
+		(symbol "TPA191Ax_1_1"
+			(rectangle
+				(start -6.35 6.35)
+				(end 6.35 -6.35)
+				(stroke
+					(width 0)
+					(type solid)
+				)
+				(fill
+					(type color)
+					(color 255 255 194 1)
+				)
+			)
+			(pin passive line
+				(at -8.89 0 0)
+				(length 2.54)
+				(name "REF"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+				(number "1"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+			)
+			(pin power_in line
+				(at -8.89 -2.54 0)
+				(length 2.54)
+				(name "VS"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+				(number "3"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+			)
+			(pin passive line
+				(at -3.81 8.89 270)
+				(length 2.54)
+				(name "IN+"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+				(number "4"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+			)
+			(pin power_in line
+				(at 0 -8.89 90)
+				(length 2.54)
+				(name "GND"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+				(number "2"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+			)
+			(pin passive line
+				(at 3.81 8.89 270)
+				(length 2.54)
+				(name "IN-"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+				(number "5"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+			)
+			(pin output line
+				(at 8.89 0 180)
+				(length 2.54)
+				(name "OUT"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+				(number "6"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+			)
+		)
+		(embedded_fonts no)
+	)
 	(symbol "CH224Q"
 		(extends "CH224A")
 		(property "Reference" "U"