Version 4
SHEET 1 880 680
WIRE -320 -160 -320 -192
WIRE -80 -160 -80 -192
WIRE 464 -160 464 -208
WIRE 560 -160 560 -208
WIRE -320 -48 -320 -80
WIRE -80 -48 -80 -80
WIRE 464 -48 464 -80
WIRE 560 -48 560 -80
WIRE 160 16 128 16
WIRE 272 16 240 16
WIRE -224 64 -272 64
WIRE -112 96 -144 96
WIRE 0 96 -32 96
WIRE 192 128 192 112
WIRE 0 144 0 96
WIRE 128 144 128 16
WIRE 128 144 0 144
WIRE 160 144 128 144
WIRE 272 160 272 16
WIRE 272 160 224 160
WIRE 496 160 464 160
WIRE 592 160 576 160
WIRE -224 176 -224 144
WIRE 160 176 128 176
WIRE 128 224 128 176
WIRE 192 224 192 192
WIRE -224 240 -272 240
WIRE 272 256 272 160
WIRE -112 272 -144 272
WIRE 0 272 0 144
WIRE 0 272 -32 272
WIRE 528 272 528 256
WIRE 368 288 352 288
WIRE 464 288 464 160
WIRE 464 288 448 288
WIRE 496 288 464 288
WIRE 592 304 592 160
WIRE 592 304 560 304
WIRE 624 304 592 304
WIRE 496 320 464 320
WIRE -224 352 -224 320
WIRE 272 368 272 336
WIRE 464 368 464 320
WIRE 528 368 528 336
FLAG 128 224 0
FLAG 464 368 0
FLAG 464 -48 0
FLAG 560 -48 0
FLAG 464 -208 15V
FLAG 560 -208 -15V
FLAG 192 112 15V
FLAG 528 256 15V
FLAG 192 224 -15V
FLAG 528 368 -15V
FLAG 272 368 0
FLAG -224 352 0
FLAG -224 176 0
FLAG -320 -192 in1
FLAG -80 -192 in2
FLAG -80 -48 0
FLAG -320 -48 0
FLAG -272 64 in1
FLAG -272 240 in2
FLAG 624 304 Vout
SYMBOL AutoGenerated\\UA741 192 160 R0
SYMATTR InstName U1
SYMBOL AutoGenerated\\UA741 528 304 R0
SYMATTR InstName U2
SYMBOL res 256 0 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 51k
SYMBOL res 592 144 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 51k
SYMBOL res 464 272 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 51k
SYMBOL res -16 80 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 51k
SYMBOL res -16 256 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 51k
SYMBOL voltage 464 -176 R0
SYMATTR InstName V1
SYMATTR Value 15V
SYMBOL voltage 560 -176 R0
SYMATTR InstName V2
SYMATTR Value -15V
SYMBOL pot -240 48 R0
WINDOW 0 33 96 Left 0
WINDOW 39 33 80 Left 0
SYMATTR InstName X1
SYMATTR SpiceLine R = 20k val = 99
SYMBOL pot -240 224 R0
WINDOW 0 32 96 Left 0
WINDOW 39 33 81 Left 0
SYMATTR InstName X2
SYMATTR SpiceLine R = 20k val = 99
SYMBOL pot 256 240 R0
WINDOW 0 32 0 Left 0
WINDOW 39 32 17 Left 0
SYMATTR InstName X3
SYMATTR SpiceLine R = 100k val = 99
SYMBOL voltage -320 -176 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value SINE(0 2 450)
SYMBOL voltage -80 -176 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V4
SYMATTR Value SINE(0 2 550)
TEXT -354 472 Left 2 !.tran 0 15m 0 1m