diff --git a/KiCad/0002-PC817-Series-PhotoCoupler-Tester/0002-PC817-Series-PhotoCoupler-Tester-backups/0002-PC817-Series-PhotoCoupler-Tester-2025-10-08_195018.zip b/KiCad/0002-PC817-Series-PhotoCoupler-Tester/0002-PC817-Series-PhotoCoupler-Tester-backups/0002-PC817-Series-PhotoCoupler-Tester-2025-10-08_195018.zip
new file mode 100644
index 0000000..53afc61
Binary files /dev/null and b/KiCad/0002-PC817-Series-PhotoCoupler-Tester/0002-PC817-Series-PhotoCoupler-Tester-backups/0002-PC817-Series-PhotoCoupler-Tester-2025-10-08_195018.zip differ
diff --git a/KiCad/0002-PC817-Series-PhotoCoupler-Tester/0002-PC817-Series-PhotoCoupler-Tester.kicad_sch b/KiCad/0002-PC817-Series-PhotoCoupler-Tester/0002-PC817-Series-PhotoCoupler-Tester.kicad_sch
index 3bfa051..ab8ec0b 100644
--- a/KiCad/0002-PC817-Series-PhotoCoupler-Tester/0002-PC817-Series-PhotoCoupler-Tester.kicad_sch
+++ b/KiCad/0002-PC817-Series-PhotoCoupler-Tester/0002-PC817-Series-PhotoCoupler-Tester.kicad_sch
@@ -6,8 +6,8 @@
 	(paper "A4")
 	(title_block
 		(title "ToGo Lab PC817 Optocoupler Tester")
-		(date "2025-10-07")
-		(rev "#0001")
+		(date "2025-10-08")
+		(rev "#0002")
 		(company "ToGo-Lab")
 		(comment 1 " - https://togo-lab.io/")
 		(comment 2 " - Email: tgohle@togo-lab.io")
@@ -2188,9 +2188,20 @@
 		)
 		(uuid "fd14dcb9-0f87-4c7f-8aad-8decfeebdade")
 	)
+	(text "To avoid inductance:\nall R (carbon)\nThin-film resistors\nAccuracy 5% sufficient"
+		(exclude_from_sim no)
+		(at 178.054 65.532 0)
+		(effects
+			(font
+				(size 1.27 1.27)
+			)
+			(justify left)
+		)
+		(uuid "25e63d0b-0be7-47d7-8c9a-1ffb1a4ca34e")
+	)
 	(text "Adjust Jumper for\nFrequency Response\nCheck\n"
 		(exclude_from_sim no)
-		(at 186.436 75.184 0)
+		(at 178.054 75.438 0)
 		(effects
 			(font
 				(size 1.27 1.27)
diff --git a/StripBoard/0002-PC817-Series-PhotoCoupler-Tester_SB.BAK b/StripBoard/0002-PC817-Series-PhotoCoupler-Tester_SB.BAK
index d28d73f..29879ab 100644
Binary files a/StripBoard/0002-PC817-Series-PhotoCoupler-Tester_SB.BAK and b/StripBoard/0002-PC817-Series-PhotoCoupler-Tester_SB.BAK differ
diff --git a/StripBoard/0002-PC817-Series-PhotoCoupler-Tester_SB.OLD b/StripBoard/0002-PC817-Series-PhotoCoupler-Tester_SB.OLD
index fe714de..1977971 100644
Binary files a/StripBoard/0002-PC817-Series-PhotoCoupler-Tester_SB.OLD and b/StripBoard/0002-PC817-Series-PhotoCoupler-Tester_SB.OLD differ
diff --git a/StripBoard/0002-PC817-Series-PhotoCoupler-Tester_SB.jpg b/StripBoard/0002-PC817-Series-PhotoCoupler-Tester_SB.jpg
index b9b5e08..a0887e5 100644
Binary files a/StripBoard/0002-PC817-Series-PhotoCoupler-Tester_SB.jpg and b/StripBoard/0002-PC817-Series-PhotoCoupler-Tester_SB.jpg differ
diff --git a/StripBoard/0002-PC817-Series-PhotoCoupler-Tester_SB.lm4 b/StripBoard/0002-PC817-Series-PhotoCoupler-Tester_SB.lm4
index 2f6e1e4..e267c10 100644
Binary files a/StripBoard/0002-PC817-Series-PhotoCoupler-Tester_SB.lm4 and b/StripBoard/0002-PC817-Series-PhotoCoupler-Tester_SB.lm4 differ