Version 4
SHEET 1 1200 1172
WIRE 128 -48 128 -80
WIRE 32 -16 -320 -16
WIRE -320 32 -320 -16
WIRE 128 64 128 32
WIRE -320 128 -320 112
WIRE 128 176 128 144
WIRE 32 192 32 -16
WIRE 96 192 32 192
WIRE 288 208 160 208
WIRE 352 208 288 208
WIRE 96 224 -320 224
WIRE -320 256 -320 224
WIRE 288 256 288 208
WIRE 128 272 128 240
WIRE -320 352 -320 336
WIRE 288 384 288 336
FLAG 128 64 0
FLAG -320 352 0
FLAG 352 208 out
IOPIN 352 208 Out
FLAG -320 224 in+
FLAG 128 144 V+
FLAG 128 -80 V+
FLAG 128 272 0
FLAG -320 128 0
FLAG -320 -16 in-
FLAG 288 384 0
SYMBOL voltage 128 -64 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 10
SYMBOL opamp2 128 144 R0
SYMATTR InstName U1
SYMATTR Value LM324
SYMBOL voltage -320 240 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value SINE(0 1 50)
SYMBOL voltage -320 16 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value PULSE(-1.1 1 0 0.5m 0.5m 0 1m)
SYMBOL Misc\\EuropeanResistor 272 240 R0
SYMATTR InstName R1
SYMATTR Value 2k
TEXT -440 -272 Left 2 !.tran 0 2m 0 .5u
TEXT 256 128 Left 2 ;Universal Symbol \n"opamp2" used
TEXT -128 -464 Left 2 ;LM324 from TI\n \nThe LM324 is used with the universal symbol "opamp2" \nfrom the standard LTSPICE [Opamps] menue. Simply\nplace this symbol "opamp2" on the schematic. Then replace\nthe text "opamp2" with  LM324. Don't forget to \nset the model path with a Spiceline\n.include LM324.5_1\nKeep the model fle in the same directory where this schematic is saved.
TEXT -440 -304 Left 2 !.options plotwinsize=0
TEXT -440 -392 Left 2 !.include LM324.5_1