Version 4
SHEET 1 880 680
WIRE 176 112 16 112
WIRE 304 112 240 112
WIRE 16 160 16 112
WIRE 304 160 304 112
WIRE 16 304 16 240
WIRE 176 304 176 128
WIRE 304 304 304 240
FLAG 16 304 0
FLAG 304 304 0
FLAG 176 304 0
SYMBOL voltage 16 144 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 2
SYMBOL Digital\\schmtinv 176 48 R0
WINDOW 123 -51 -8 Left 2
WINDOW 39 -6 10 Left 2
SYMATTR InstName A1
SYMBOL res 288 144 R0
SYMATTR InstName R1
SYMATTR Value 1k
TEXT 48 272 Left 2 !;tran 1s
TEXT 56 256 Left 2 !.dc V1 0 5 0.5