Version 4
SHEET 1 880 680
WIRE 16 -32 -160 -32
WIRE 80 -32 16 -32
WIRE 448 -32 80 -32
WIRE -160 -16 -160 -32
WIRE 448 0 448 -32
WIRE -160 80 -160 64
WIRE 80 128 80 -32
WIRE 128 128 80 128
WIRE 544 128 384 128
WIRE -16 160 -160 160
WIRE -160 176 -160 160
WIRE -16 192 -16 160
WIRE 128 192 -16 192
WIRE 448 192 448 80
WIRE 448 192 384 192
WIRE 544 192 448 192
WIRE 128 256 32 256
WIRE 432 256 384 256
WIRE -160 272 -160 256
WIRE 128 320 80 320
WIRE 432 320 432 256
WIRE 432 320 384 320
WIRE -16 352 -160 352
WIRE 32 352 32 256
WIRE 32 352 -16 352
WIRE 80 352 80 320
WIRE 432 352 432 320
WIRE -160 368 -160 352
WIRE -160 464 -160 448
FLAG 16 -32 +5V
FLAG 80 352 0
FLAG 432 352 0
FLAG -160 272 0
FLAG -160 464 0
FLAG -16 160 in+
FLAG -16 352 in-
FLAG 544 128 out
FLAG 544 192 _out
FLAG -160 80 0
SYMBOL voltage -160 160 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value SINE(1 1 1e6)
SYMBOL voltage -160 -32 R0
SYMATTR InstName V2
SYMATTR Value 5
SYMBOL Comparators\\LT1671 256 224 R0
SYMATTR InstName U1
SYMBOL voltage -160 352 R0
SYMATTR InstName V3
SYMATTR Value 1
SYMBOL res 432 -16 R0
SYMATTR InstName R1
SYMATTR Value 470
TEXT -170 -118 Left 0 !.tran 10u
TEXT -176 -200 Left 0 ;The output voltage should rise to 5V with a pullup resistor, shouldn't it?