Version 4
SHEET 1 880 680
WIRE 256 48 112 48
WIRE 464 48 336 48
WIRE 288 112 208 112
WIRE 464 112 464 48
WIRE 464 112 432 112
WIRE 16 128 -48 128
WIRE 112 128 112 48
WIRE 112 128 96 128
WIRE 144 128 112 128
WIRE 288 128 288 112
WIRE 368 128 288 128
WIRE -48 160 -48 128
FLAG 144 160 0
FLAG -48 240 0
FLAG 464 192 0
FLAG 368 160 0
SYMBOL Digital\\schmitt 144 64 R0
SYMATTR InstName A1
SYMBOL voltage -48 144 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value SINE(.5 .5 1k)
SYMBOL res 448 96 R0
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL Digital\\schmitt 368 64 R0
SYMATTR InstName A2
SYMBOL res 112 112 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 5k
SYMBOL res 352 32 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 10k
TEXT 224 240 Left 2 !.tran 0 2m 0 1u