diff --git a/RT77-oper/14-shmidt-trigger.CIR b/RT77-oper/14-shmidt-trigger.CIR
new file mode 100755
index 0000000..9b9c22c
--- /dev/null
+++ b/RT77-oper/14-shmidt-trigger.CIR
@@ -0,0 +1,1003 @@
+[Main]
+FileType=CIR
+Version=10.01
+Program=Micro-Cap
+Component Version=10.00
+Shape Version=10.01
+Screen=1280,1024
+MCAPVersion=10.0.8.2
+Key ID=0
+NLCnt=21
+TXCnt=7
+
+[shapedef]
+Name=Battery
+Line=0,0,22,0
+Line=22,-3,22,3
+Line=26,-7,26,7
+Line=26,0,48,0
+Current=32,8,16,8
+
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+Line=0,0,12,0
+Line=12,-8,12,8
+Line=18,-4,18,4
+Line=24,0,24,0
+
+[shapedef]
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+
+[shapedef]
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+Line=48,24,72,24
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+Line=12,10,12,14
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+Line=4,0,6,0
+
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+Root="Plus.root",25,-4,0
+Root="Minus.root",25,52,0
+Line=32,56,32,34
+Line=32,-8,32,13
+
+[shapedef]
+Name=Plus.root
+Line=-2,0,2,0
+Line=0,-2,0,2
+
+[shapedef]
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+Current=32,8,16,8
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+Line=26,-2,22,2
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+Line=22,4,24,6
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+Ellipse=12,-12,36,12
+FColor=None
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+Root="Plus.root",41,7,0
+Current=32,16,16,16
+
+[compdef]
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+memo=Dual General-Purpose JFET-Input Opamp
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+PinCnt=5
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+Pin="Minus input",0,6,-36,17
+Pin="VEE",4,7,6,5
+Pin="Output",9,3,-13,-4
+Pin="VCC",4,-1,6,4
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+[compdef]
+Name=Battery
+Definition=Battery
+Shape=Battery
+Mask=5633
+Used=9
+memo=Battery
+Label Offset=19,7,10,13
+PinCnt=2
+Pin="Plus",6,0,-4,-5
+Pin="Minus",0,0,-10,-5
+
+[compdef]
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+Shape=Ground
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+Used=44
+memo=Ground
+Label Offset=0,0,0,0
+PinCnt=1
+Pin="PinA",0,0,-3,-7
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+[compdef]
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+Definition=Resistor
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+memo=Resistor
+Label Offset=18,6,8,11
+PinCnt=2
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+Pin="Minus",0,0,-14,-4
+
+[compdef]
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+Definition=Sine source
+Shape=Sine_Source
+Mask=5889
+Used=6
+memo=Sine Source
+Label Offset=18,12,15,12
+PinCnt=2
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+Pin="Minus",0,0,-19,-6
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+[Attr]
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+[Attr]
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+[Attr]
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+[Comp]
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+[Attr]
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+[Attr]
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+[Comp]
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+[Attr]
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+[Attr]
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+V
+
+[Wire]
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+
+[Wire]
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+
+[Wire]
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+
+[Wire]
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+
+[Wire]
+Grids=49,46,52,46
+
+[Wire]
+Grids=49,46,49,55
+
+[Wire]
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+
+[Wire]
+Grids=49,40,50,40
+
+[Wire]
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+
+[Comp]
+Name=Ground
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+
+[Comp]
+Name=Sine Source
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+[Attr]
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+[Attr]
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+
+[Attr]
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+V
+
+[Comp]
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+[Wire]
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+[Comp]
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+[Attr]
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+[Attr]
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+[Attr]
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+
+[Grid Text]
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+[Grid Text]
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+[Grid Text]
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+[Grid Text]
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+[Grid Text]
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+[Grid Text]
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+[Grid Text]
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+[Schematic]
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+
+[Tools]
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+[Section]
+Index=0
+Name="15-shmidt-trigger"
+Type=Main
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+[Page]
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+[Page]
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+[Page]
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+[Page]
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+[Page]
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+[Text Area]
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+[Text Area]
+Section=0
+Page=2
+Font=Height=-15,FStyle=0,Color=#000000,Name=Courier New
+Comment Color=#008000
+Background Color=#FFFFFF
+Text=*** From file C:\MC10\library\UTILITY.LBR
+Text=*** 60HZ Sinusoidal Source
+Text=.MODEL 60HZ SIN (F=100)
+Text=.MODEL SINE SIN (F=100)
+Text=*** From file C:\MC10\library\UTILITY.LBR
+Text=*** 1MHz Sinusoidal Source
+Text=.MODEL 1MHZ SIN (A=5 F=10 PH=1)
+
+[Transient]
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+Data Point Labels Color Back=#FFFF00
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+[Tools]
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+[APage]
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+
+[Monte Carlo Options]
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+
+[Limits]
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+
+[WaveForm]
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+[WaveForm]
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+[Limits]
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+[Limits]
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+[Pane]
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+
+[Pane]
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+[Pane]
+Analysis=DC
+
+[Pane]
+Analysis=HmDistortion
+
+[Pane]
+Analysis=ImDistortion
+
+[Watch]
+Analysis=Transient
+Format=3
+ExprPercentWidth=80
+
+[OPMethods]
+Analysis=Transient
+Standard Newton-Raphson=0,0
+Source Stepping=0,0
+Diagonal Gmin Stepping=0,0
+Junction Gmin Stepping=0,0
+Pseudo Transient=0,0
+
+[OPMethods]
+Analysis=AC
+Standard Newton-Raphson=0,0
+Source Stepping=0,0
+Diagonal Gmin Stepping=0,0
+Junction Gmin Stepping=0,0
+Pseudo Transient=0,0
+
+[OPMethods]
+Analysis=DC
+Standard Newton-Raphson=0,0
+Source Stepping=0,0
+Diagonal Gmin Stepping=0,0
+Junction Gmin Stepping=0,0
+Pseudo Transient=0,0
diff --git a/RT77-oper/15-multivibrator.CIR b/RT77-oper/15-multivibrator.CIR
new file mode 100755
index 0000000..3c7b37d
--- /dev/null
+++ b/RT77-oper/15-multivibrator.CIR
@@ -0,0 +1,1311 @@
+[Main]
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+Shape Version=10.01
+Screen=1280,1024
+MCAPVersion=10.0.8.2
+Key ID=0
+NLCnt=31
+TXCnt=7
+
+[shapedef]
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+Line=22,-3,22,3
+Line=26,-7,26,7
+Line=26,0,48,0
+Current=32,8,16,8
+
+[shapedef]
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+Line=26,-8,26,8
+Line=26,0,48,0
+Current=32,12,16,12
+
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+Line=32,-8,32,13
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+
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+Label Offset=19,7,10,13
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+PinCnt=1
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+
+[compdef]
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+
+[compdef]
+Name=Resistor
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+
+[Grid Text]
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+[Schematic]
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+
+[Tools]
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diff --git a/RT77-oper/15-multivibrator.bmp b/RT77-oper/15-multivibrator.bmp
new file mode 100755
index 0000000..3aa4afc
Binary files /dev/null and b/RT77-oper/15-multivibrator.bmp differ