Version 4
SHEET 1 1452 952
WIRE -32 32 -112 32
WIRE 0 32 -32 32
WIRE 144 32 80 32
WIRE 224 32 144 32
WIRE 448 32 304 32
WIRE -112 48 -112 32
WIRE 208 128 208 112
WIRE 176 144 112 144
WIRE -112 160 -112 128
WIRE 272 160 240 160
WIRE 304 160 272 160
WIRE 320 160 304 160
WIRE 432 160 400 160
WIRE 448 160 448 32
WIRE 448 160 432 160
WIRE 144 176 144 32
WIRE 176 176 144 176
WIRE 208 208 208 192
WIRE 448 240 448 160
WIRE -112 288 -112 272
WIRE -16 288 -16 272
WIRE 112 288 112 144
WIRE 160 288 112 288
WIRE 272 288 272 160
WIRE 272 288 240 288
WIRE 112 304 112 288
WIRE -112 400 -112 368
WIRE -16 400 -16 368
WIRE 112 400 112 384
WIRE 448 400 448 320
FLAG 112 400 0
FLAG -112 160 0
FLAG 448 400 0
FLAG 208 112 V+
FLAG 208 208 V-
FLAG -112 400 0
FLAG -16 400 0
FLAG -112 272 V+
FLAG -16 272 V-
FLAG 304 160 opa
FLAG 432 160 UL
FLAG -32 32 U1
SYMBOL res 96 288 R0
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL res 144 304 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL res 208 48 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R3
SYMATTR Value 10k
SYMBOL res -16 48 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R4
SYMATTR Value 11k
SYMBOL voltage -112 32 R0
SYMATTR InstName V1
SYMATTR Value 2
SYMBOL res 304 176 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R5
SYMATTR Value 1k
SYMBOL res 432 224 R0
SYMATTR InstName RL
SYMATTR Value {R+1m}
SYMBOL voltage -112 272 R0
SYMATTR InstName V2
SYMATTR Value 15
SYMBOL voltage -16 272 R0
SYMATTR InstName V3
SYMATTR Value -15
SYMBOL Opamps\\UniversalOpamp2 208 160 R0
SYMATTR InstName U1
TEXT -112 -40 Left 0 !.op
TEXT -112 -80 Left 0 !.step param R 0 1k 100
TEXT 272 -72 Left 0 ;R4 = R1/R2*(R3+R5)
TEXT 480 200 Left 0 ;I=U1*R2/(R1*R5)
LINE Normal 464 192 448 208
LINE Normal 448 208 464 192
LINE Normal 432 192 448 208