Version 4
SHEET 1 1228 680
WIRE -64 -64 -144 -64
WIRE 64 -64 16 -64
WIRE -144 -48 -144 -64
WIRE -144 48 -144 32
WIRE -64 112 -240 112
WIRE 64 112 64 -64
WIRE 64 112 16 112
WIRE 112 112 64 112
WIRE -240 128 -240 112
WIRE 224 128 176 128
WIRE 272 128 224 128
WIRE 112 144 64 144
WIRE -240 224 -240 208
WIRE -64 288 -144 288
WIRE 64 288 64 144
WIRE 64 288 16 288
WIRE 112 288 64 288
WIRE 224 288 224 128
WIRE 224 288 192 288
WIRE -144 304 -144 288
WIRE -144 400 -144 384
WIRE -256 496 -256 480
WIRE -256 592 -256 576
FLAG -144 48 0
FLAG -240 224 0
FLAG -144 400 0
FLAG 272 128 Ua
FLAG -240 112 Ue
FLAG -256 592 0
FLAG -256 480 test
SYMBOL Opamps\\opamp 144 192 M180
SYMATTR InstName U1
SYMBOL voltage -144 -64 R0
SYMATTR InstName V2
SYMATTR Value 6
SYMBOL voltage -240 112 R0
SYMATTR InstName V1
SYMATTR Value 0
SYMBOL voltage -144 288 R0
SYMATTR InstName V3
SYMATTR Value 2.5
SYMBOL Misc\\EuropeanResistor -80 -48 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value 33k
SYMBOL Misc\\EuropeanResistor -80 128 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL Misc\\EuropeanResistor -80 304 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R3
SYMATTR Value 10k
SYMBOL Misc\\EuropeanResistor 96 304 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R4
SYMATTR Value 33k
SYMBOL bv -256 480 R0
SYMATTR InstName B1
SYMATTR Value V= (V(Ue)*33/43 + 6*10/43)*4.3 -2.5*3.3
TEXT -216 -240 Left 2 !.dc V1 0 5 1m
TEXT -216 -208 Left 2 !.lib opamp.sub
TEXT -256 -352 Left 2 ;Ua =  ( Ue*R1/(R1+R2) + 6V*R2/(R1+R2) )*(1+R4/R3) -2,5*R4/R3\n \nUa = (Ue*33/43 + 6V*10/43)*4,3 -2,5*3,3