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diff --git a/analog circuits/differential amplifier using op amp/differential amplifier using op amp-cache.lib b/analog circuits/differential amplifier using op amp/differential amplifier using op amp-cache.lib
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+++ b/analog circuits/differential amplifier using op amp/differential amplifier using op amp-cache.lib
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+EESchema-LIBRARY Version 2.4
+#encoding utf-8
+#
+# Device:Opamp_Dual_Generic
+#
+DEF Device:Opamp_Dual_Generic U 0 20 Y Y 3 F N
+F0 "U" 0 200 50 H V L CNN
+F1 "Device:Opamp_Dual_Generic" 0 -200 50 H V L CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ SOIC*3.9x4.9mm*P1.27mm*
+ DIP*W7.62mm*
+ MSOP*3x3mm*P0.65mm*
+ SSOP*2.95x2.8mm*P0.65mm*
+ TSSOP*3x3mm*P0.65mm*
+ VSSOP*P0.5mm*
+ TO?99*
+$ENDFPLIST
+DRAW
+P 4 1 1 10 -200 200 200 0 -200 -200 -200 200 f
+P 4 2 1 10 -200 200 200 0 -200 -200 -200 200 f
+X ~ 1 300 0 100 L 50 50 1 1 O
+X - 2 -300 -100 100 R 50 50 1 1 I
+X + 3 -300 100 100 R 50 50 1 1 I
+X + 5 -300 100 100 R 50 50 2 1 I
+X - 6 -300 -100 100 R 50 50 2 1 I
+X ~ 7 300 0 100 L 50 50 2 1 O
+X V- 4 -100 -300 150 U 50 50 3 1 W
+X V+ 8 -100 300 150 D 50 50 3 1 W
+ENDDRAW
+ENDDEF
+#
+# Device:R
+#
+DEF Device:R R 0 0 N Y 1 F N
+F0 "R" 80 0 50 V V C CNN
+F1 "Device:R" 0 0 50 V V C CNN
+F2 "" -70 0 50 V I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ R_*
+$ENDFPLIST
+DRAW
+S -40 -100 40 100 0 1 10 N
+X ~ 1 0 150 50 D 50 50 1 1 P
+X ~ 2 0 -150 50 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# power:GND
+#
+DEF power:GND #PWR 0 0 Y Y 1 F P
+F0 "#PWR" 0 -250 50 H I C CNN
+F1 "power:GND" 0 -150 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+P 6 0 1 0 0 0 0 -50 50 -50 0 -100 -50 -50 0 -50 N
+X GND 1 0 0 0 D 50 50 1 1 W N
+ENDDRAW
+ENDDEF
+#
+# power:PWR_FLAG
+#
+DEF power:PWR_FLAG #FLG 0 0 N N 1 F P
+F0 "#FLG" 0 75 50 H I C CNN
+F1 "power:PWR_FLAG" 0 150 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+P 6 0 1 0 0 0 0 50 -40 75 0 100 40 75 0 50 N
+X pwr 1 0 0 0 U 50 50 0 0 w
+ENDDRAW
+ENDDEF
+#
+# power:VDD
+#
+DEF power:VDD #PWR 0 0 Y Y 1 F P
+F0 "#PWR" 0 -150 50 H I C CNN
+F1 "power:VDD" 0 150 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+C 0 75 25 0 1 0 N
+P 2 0 1 0 0 0 0 50 N
+X VDD 1 0 0 0 U 50 50 1 1 W N
+ENDDRAW
+ENDDEF
+#
+# power:VSS
+#
+DEF power:VSS #PWR 0 0 Y Y 1 F P
+F0 "#PWR" 0 -150 50 H I C CNN
+F1 "power:VSS" 0 150 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+C 0 75 25 0 1 0 N
+P 2 0 1 0 0 0 0 50 N
+X VSS 1 0 0 0 U 50 50 1 1 W N
+ENDDRAW
+ENDDEF
+#
+# pspice:VSOURCE
+#
+DEF pspice:VSOURCE V 0 40 Y Y 1 F N
+F0 "V" -250 300 50 H V C CNN
+F1 "pspice:VSOURCE" 0 0 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+C 0 0 200 0 1 0 N
+T 0 -320 -10 50 0 0 1 V Normal 0 C C
+P 2 0 1 0 -250 -250 -250 150 F
+P 3 0 1 0 -300 150 -250 250 -200 150 F
+X E1 1 0 300 100 D 50 50 1 1 I
+X E2 2 0 -300 100 U 50 50 1 1 I
+ENDDRAW
+ENDDEF
+#
+#End Library