Version 4
SHEET 1 880 680
WIRE 240 64 112 64
WIRE 368 80 304 80
WIRE 112 144 112 64
WIRE 368 144 368 80
WIRE 368 144 112 144
WIRE 112 176 112 144
WIRE 112 288 112 256
FLAG 112 352 0
FLAG 368 224 0
SYMBOL Digital\\schmitt 240 0 R0
WINDOW 3 0 0 Invisible 2
SYMATTR Value Vt=2.5 Vh=1 Ref=2.5
SYMATTR InstName A1
SYMATTR SpiceLine Td=5n Trise=5n Tfall=5n
SYMATTR SpiceLine2 Vhigh=5 Vlow=0  Ref=2.5
SYMBOL res 96 160 R0
SYMATTR InstName R1
SYMATTR Value 100000
SYMBOL cap 96 288 R0
SYMATTR InstName C1
SYMATTR Value 100n
SYMBOL res 352 128 R0
SYMATTR InstName R2
SYMATTR Value 1000
TEXT 96 376 Left 2 !.tran 0 10m 0 100n