Version 4
SHEET 1 1264 800
WIRE 928 64 736 64
WIRE 1040 64 928 64
WIRE 1136 64 1040 64
WIRE 736 80 736 64
WIRE 1040 80 1040 64
WIRE 1136 80 1136 64
WIRE 928 112 928 64
WIRE 848 160 816 160
WIRE 736 176 736 160
WIRE 1040 176 1040 160
WIRE 1040 176 1008 176
WIRE 560 240 528 240
WIRE 816 240 816 160
WIRE 816 240 640 240
WIRE 848 240 816 240
WIRE 1136 256 1136 160
WIRE 1136 256 1008 256
WIRE 848 304 832 304
WIRE 976 400 976 384
WIRE 880 416 880 384
FLAG 736 176 0
FLAG 528 240 0
FLAG 880 416 0
SYMBOL voltage 736 64 R0
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL voltage 656 240 R90
WINDOW 3 32 56 VTop 2
WINDOW 123 74 56 VTop 2
WINDOW 39 53 56 VTop 2
WINDOW 0 -32 56 VBottom 2
SYMATTR Value PULSE(0 3.3 0 .5m .5m 0 1m)
SYMATTR InstName V2
SYMBOL res 1024 64 R0
SYMATTR InstName R1
SYMATTR Value 10K
SYMBOL res 1120 64 R0
SYMATTR InstName R2
SYMATTR Value 10K
SYMBOL Comparators\\LTC1843 928 240 R0
SYMATTR InstName U1
TEXT 1120 344 Left 2 !.tran 3m