Version 4
SHEET 1 880 860
WIRE 48 -240 16 -240
WIRE 160 -240 128 -240
WIRE -128 -160 -160 -160
WIRE 16 -160 16 -240
WIRE 16 -160 -48 -160
WIRE 64 -160 16 -160
WIRE 160 -144 160 -240
WIRE 160 -144 128 -144
WIRE 288 -144 160 -144
WIRE 64 -128 16 -128
WIRE -192 -48 -208 -48
WIRE -96 -48 -112 -48
WIRE 16 -48 16 -128
WIRE 16 -48 -16 -48
WIRE 48 -48 16 -48
WIRE 160 -48 128 -48
WIRE 192 -48 160 -48
WIRE 288 -48 288 -144
WIRE 288 -48 272 -48
WIRE 160 -16 160 -48
WIRE -288 64 -288 48
WIRE 160 96 160 64
WIRE -288 160 -288 144
WIRE 48 192 16 192
WIRE 160 192 128 192
WIRE -128 272 -160 272
WIRE 16 272 16 192
WIRE 16 272 -48 272
WIRE 64 272 16 272
WIRE 160 288 160 192
WIRE 160 288 128 288
WIRE 288 288 160 288
WIRE 64 304 16 304
WIRE -192 384 -208 384
WIRE -96 384 -112 384
WIRE 16 384 16 304
WIRE 16 384 -16 384
WIRE 48 384 16 384
WIRE 160 384 128 384
WIRE 192 384 160 384
WIRE 288 384 288 288
WIRE 288 384 272 384
WIRE 160 416 160 384
WIRE -288 528 -288 512
WIRE -176 528 -176 512
WIRE 160 528 160 496
WIRE -288 624 -288 608
WIRE -176 624 -176 608
FLAG -176 624 0
FLAG -288 624 0
FLAG 96 -176 V1
FLAG -288 512 V1
FLAG 96 -112 V2
FLAG -176 512 V2
FLAG 160 96 0
FLAG -288 48 Vin
FLAG -288 160 0
FLAG -208 -48 Vin
FLAG -160 -160 0
FLAG 96 256 V1
FLAG 96 320 V2
FLAG 160 528 0
FLAG -160 272 Vin
FLAG -208 384 0
SYMBOL Opamps\\UniversalOpamp2 96 -144 R0
SYMATTR InstName U1
SYMBOL res -96 -64 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL res -32 -176 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL res 144 -256 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 1k
SYMBOL res 288 -64 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 240
SYMBOL voltage -288 512 R0
WINDOW 123 24 120 Left 2
WINDOW 39 24 108 Left 2
SYMATTR InstName V1
SYMATTR Value 10
SYMBOL voltage -176 512 R0
WINDOW 123 24 120 Left 2
WINDOW 39 24 108 Left 2
SYMATTR InstName V2
SYMATTR Value -10
SYMBOL voltage -288 48 R0
WINDOW 123 24 120 Left 2
WINDOW 39 24 108 Left 2
SYMATTR InstName V3
SYMATTR Value SINE(0 0.6 1k 0 0 0 2)
SYMBOL res 144 -64 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R9
SYMATTR Value 1k
SYMBOL res 0 -64 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R10
SYMATTR Value 240
SYMBOL Opamps\\UniversalOpamp2 96 288 R0
SYMATTR InstName U2
SYMBOL res -96 368 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 1k
SYMBOL res -32 256 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 1k
SYMBOL res 144 176 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 1k
SYMBOL res 288 368 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R8
SYMATTR Value 240
SYMBOL res 144 368 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R11
SYMATTR Value 1k
SYMBOL res 0 368 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R12
SYMATTR Value 240
SYMBOL Misc\\EuropeanResistor 144 -32 R0
SYMATTR InstName RL
SYMATTR Value {RL}
SYMBOL Misc\\EuropeanResistor 144 400 R0
SYMATTR InstName RL1
SYMATTR Value {RL}
TEXT -312 -272 Left 2 !.tran 4m
TEXT -312 -248 Left 2 ;.step param RL list 10m 1k
TEXT -312 -224 Left 2 !.param RL=10m