Version 4
SHEET 1 880 680
WIRE 256 80 256 64
WIRE 224 96 144 96
WIRE 368 112 288 112
WIRE -192 128 -320 128
WIRE -48 128 -192 128
WIRE 224 128 -48 128
WIRE 368 144 368 112
WIRE -320 160 -320 128
WIRE 256 160 256 144
WIRE -320 256 -320 240
WIRE 32 256 0 256
WIRE 144 256 144 96
WIRE 144 256 112 256
WIRE 240 256 144 256
WIRE 368 256 368 224
WIRE 368 256 320 256
WIRE 432 256 368 256
WIRE 608 256 512 256
WIRE 656 256 608 256
WIRE 0 288 0 256
WIRE 144 288 144 256
WIRE 368 304 368 256
WIRE 608 304 608 256
WIRE -320 352 -320 336
WIRE -192 352 -192 336
WIRE 272 384 272 368
WIRE 144 400 144 368
WIRE 240 400 144 400
WIRE 368 416 368 384
WIRE 368 416 304 416
WIRE -48 432 -48 128
WIRE 240 432 -48 432
WIRE 608 432 608 384
WIRE -320 448 -320 432
WIRE -192 448 -192 432
WIRE 272 464 272 448
FLAG 256 64 +V
FLAG 256 160 -V
FLAG 272 368 +V
FLAG 272 464 -V
FLAG 0 288 0
FLAG -320 336 +V
FLAG -192 336 -V
FLAG -320 256 0
FLAG -320 448 0
FLAG -192 448 0
FLAG 656 256 out
FLAG -192 128 in
FLAG 608 432 0
SYMBOL Opamps\\UniversalOpamp2 256 112 R0
SYMATTR InstName U1
SYMATTR SpiceModel level.3a
SYMATTR Value2 Avol=1Meg GBW=200Meg Slew=100Meg
SYMBOL Opamps\\UniversalOpamp2 272 416 R0
SYMATTR InstName U2
SYMATTR SpiceModel level.3a
SYMATTR Value2 Avol=1Meg GBW=200Meg Slew=100Meg
SYMBOL res 352 128 R0
SYMATTR InstName R1
SYMATTR Value 22
SYMBOL res 352 400 M180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R2
SYMATTR Value 22
SYMBOL res 224 272 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R3
SYMATTR Value 10k
SYMBOL res 16 272 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R4
SYMATTR Value 3.3k
SYMBOL voltage 144 272 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value {UO}
SYMBOL voltage -320 144 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value SINE(0 1 100k)
SYMBOL voltage -320 336 R0
SYMATTR InstName V3
SYMATTR Value 15
SYMBOL voltage -192 336 R0
SYMATTR InstName V4
SYMATTR Value -15
SYMBOL res 592 288 R0
SYMATTR InstName RL
SYMATTR Value 50
SYMBOL res 416 272 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R5
SYMATTR Value 39
TEXT -336 528 Left 2 !.tran 0 20u 0 10n
TEXT -336 560 Left 2 !.options plotwinsize=0
TEXT -336 608 Left 2 !.step param UO list 0 2m