Version 4
SHEET 1 880 680
WIRE 192 64 144 64
WIRE 320 64 272 64
WIRE 0 176 -192 176
WIRE 32 176 0 176
WIRE 144 176 144 64
WIRE 144 176 112 176
WIRE 208 176 144 176
WIRE 320 176 320 64
WIRE 320 176 272 176
WIRE 352 176 320 176
WIRE -192 272 -192 176
WIRE 0 320 0 176
WIRE 208 320 0 320
WIRE 352 320 272 320
FLAG 352 176 out1
IOPIN 352 176 Out
FLAG 352 320 out2
IOPIN 352 320 Out
FLAG -192 352 0
FLAG -192 176 in
SYMBOL res 128 160 R90
WINDOW 0 5 56 VBottom 0
WINDOW 3 27 56 VTop 0
SYMATTR InstName Rs
SYMATTR Value 100k
SYMBOL res 288 48 R90
WINDOW 0 5 56 VBottom 0
WINDOW 3 27 56 VTop 0
SYMATTR InstName Rf
SYMATTR Value 1Meg
SYMBOL voltage -192 256 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value PULSE(0V 5V 0s 1s 1s 0s 2s)
SYMBOL Digital\\buf1 208 112 R0
WINDOW 39 -19 104 Left 0
SYMATTR SpiceLine Vhigh=5V
SYMATTR InstName A1
SYMBOL Digital\\buf1 208 256 R0
WINDOW 39 -14 104 Left 0
SYMATTR SpiceLine Vhigh=5V
SYMATTR InstName A2
TEXT -200 72 Left 0 !.tran 0 2s 0