Version 4
SHEET 1 880 680
WIRE -192 80 -192 64
WIRE 320 128 320 112
WIRE 288 144 16 144
WIRE 416 160 352 160
WIRE 464 160 416 160
WIRE 144 176 112 176
WIRE 256 176 224 176
WIRE 288 176 256 176
WIRE -192 192 -192 160
WIRE -144 192 -192 192
WIRE 16 208 16 144
WIRE 112 208 112 176
WIRE 320 208 320 192
WIRE -192 224 -192 192
WIRE -144 224 -144 192
WIRE 256 272 256 176
WIRE 288 272 256 272
WIRE 416 272 416 160
WIRE 416 272 368 272
WIRE -192 320 -192 304
WIRE 16 320 16 288
WIRE 112 320 112 288
FLAG -144 224 0
FLAG 464 160 OUT
FLAG 16 144 IN
FLAG -192 64 V+
FLAG 320 112 V+
FLAG -192 320 V-
FLAG 320 208 V-
FLAG 112 320 0
FLAG 16 320 0
SYMBOL Opamps\\LT1001 320 96 R0
SYMATTR InstName U1
SYMBOL res 384 256 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 100k
SYMATTR SpiceLine ""
SYMBOL res 240 160 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 1k
SYMATTR SpiceLine ""
SYMBOL voltage -192 64 M0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value2 ""
SYMATTR SpiceLine ""
SYMATTR InstName V1
SYMATTR Value 12V
SYMBOL voltage -192 208 M0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value2 ""
SYMATTR SpiceLine ""
SYMATTR InstName V2
SYMATTR Value 12V
SYMBOL voltage 112 192 M0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value2 ""
SYMATTR SpiceLine ""
SYMATTR InstName Vref
SYMATTR Value 6V
SYMBOL voltage 16 192 M0
WINDOW 3 7 106 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value PULSE(5 7 0 1 1 0)
SYMATTR Value2 ""
SYMATTR SpiceLine ""
SYMATTR InstName Vin
TEXT -104 96 Left 2 !.tran 2