diff --git a/keymatrix.sch b/keymatrix.sch
index c1e44ca..801e8fb 100644
--- a/keymatrix.sch
+++ b/keymatrix.sch
@@ -1,4 +1,5 @@
 EESchema Schematic File Version 4
+LIBS:taschenrechner-cache
 EELAYER 30 0
 EELAYER END
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-F 0 "SW?" H 4850 5231 50  0000 C CNN
-F 1 "=" H 4850 5140 50  0000 C CNN
-F 2 "" H 4850 4950 50  0001 C CNN
-F 3 "~" H 4850 4950 50  0001 C CNN
-	1    4850 4950
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 	1    0    0    -1  
 $EndComp
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diff --git a/powersupply.sch b/powersupply.sch
new file mode 100644
index 0000000..707c48a
--- /dev/null
+++ b/powersupply.sch
@@ -0,0 +1,17 @@
+EESchema Schematic File Version 4
+LIBS:taschenrechner-cache
+EELAYER 30 0
+EELAYER END
+$Descr A4 11693 8268
+encoding utf-8
+Sheet 1 1
+Title ""
+Date ""
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+Comp ""
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+$EndDescr
+$EndSCHEMATC
diff --git a/taschenrechner.sch b/taschenrechner.sch
index d4191b3..c221e13 100644
--- a/taschenrechner.sch
+++ b/taschenrechner.sch
@@ -1,4 +1,5 @@
 EESchema Schematic File Version 4
+LIBS:taschenrechner-cache
 EELAYER 30 0
 EELAYER END
 $Descr A4 11693 8268
@@ -14,9 +15,15 @@ Comment3 ""
 Comment4 ""
 $EndDescr
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 U 5DC3ED85
 F0 "Sheet5DC3ED84" 50
 F1 "keymatrix.sch" 50
 $EndSheet
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+F1 "powersupply.sch" 50
+$EndSheet
 $EndSCHEMATC