Version 4
SHEET 1 1144 800
WIRE -112 80 -128 80
WIRE -16 80 -32 80
WIRE 544 96 544 80
WIRE 640 96 544 96
WIRE -16 112 -16 80
WIRE 640 112 640 96
WIRE -368 144 -368 112
WIRE 544 176 544 96
WIRE -208 192 -208 80
WIRE -208 192 -272 192
WIRE -112 192 -128 192
WIRE -16 192 -16 176
WIRE -16 192 -32 192
WIRE 48 192 -16 192
WIRE 240 192 208 192
WIRE 400 192 320 192
WIRE 512 192 400 192
WIRE 640 208 640 192
WIRE 640 208 576 208
WIRE 784 208 640 208
WIRE 448 224 352 224
WIRE 512 224 448 224
WIRE -368 256 -368 224
WIRE 544 272 544 240
WIRE 48 288 48 192
WIRE 352 288 352 224
WIRE 352 288 48 288
FLAG -368 256 0
FLAG -368 112 +5V
FLAG -272 192 0
FLAG 544 80 +5V
FLAG 544 272 0
FLAG 784 208 out
FLAG 208 192 0
FLAG 448 224 in
FLAG 400 192 threshold
SYMBOL voltage -368 128 R0
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL voltage -112 192 R90
WINDOW 3 32 56 VTop 0
WINDOW 0 -32 56 VBottom 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value PULSE(0 3.3 0 .5m .5m 0 1m)
SYMATTR InstName V2
SYMBOL res 624 96 R0
WINDOW 0 36 40 Invisible 0
SYMATTR InstName R1
SYMATTR Value 10K
SYMBOL Comparators\\LTC1841 544 208 R0
WINDOW 0 16 -32 Invisible 0
SYMATTR InstName U1
SYMBOL voltage 336 192 R90
WINDOW 3 32 56 VTop 0
WINDOW 0 -32 56 VBottom 0
SYMATTR Value 1V
SYMATTR InstName V3
SYMBOL res -16 176 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R2
SYMATTR Value 100
SYMBOL res -16 64 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R4
SYMATTR Value 100
SYMBOL voltage -112 80 R90
WINDOW 3 32 56 VTop 0
WINDOW 0 -32 56 VBottom 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value SINE(0 0.35 1e5 0 0 0 0)
SYMATTR InstName V4
SYMBOL cap -32 112 R0
SYMATTR InstName C1
SYMATTR Value .1µ
TEXT 608 360 Left 0 !.tran 1m