Version 4
SHEET 1 880 1032
WIRE -336 -160 -368 -160
WIRE -224 -160 -256 -160
WIRE -192 -160 -224 -160
WIRE -80 -160 -112 -160
WIRE -368 -128 -368 -160
WIRE -720 -64 -720 -80
WIRE -160 -48 -160 -64
WIRE -224 -32 -224 -160
WIRE -192 -32 -224 -32
WIRE -80 -16 -80 -160
WIRE -80 -16 -128 -16
WIRE 0 -16 -80 -16
WIRE -192 0 -272 0
WIRE -720 32 -720 16
WIRE -160 32 -160 16
WIRE -336 144 -368 144
WIRE -224 144 -256 144
WIRE -192 144 -224 144
WIRE -80 144 -112 144
WIRE -368 176 -368 144
WIRE -720 208 -720 192
WIRE -592 208 -592 192
WIRE -160 256 -160 240
WIRE -224 272 -224 144
WIRE -192 272 -224 272
WIRE -80 288 -80 144
WIRE -80 288 -128 288
WIRE 0 288 -80 288
WIRE -720 304 -720 288
WIRE -592 304 -592 288
WIRE -192 304 -272 304
WIRE -160 336 -160 320
WIRE -336 464 -368 464
WIRE -224 464 -256 464
WIRE -192 464 -224 464
WIRE -80 464 -112 464
WIRE -368 496 -368 464
WIRE -160 576 -160 560
WIRE -224 592 -224 464
WIRE -192 592 -224 592
WIRE -80 608 -80 464
WIRE -80 608 -128 608
WIRE 0 608 -80 608
WIRE -192 624 -272 624
WIRE -160 656 -160 640
WIRE -336 768 -368 768
WIRE -224 768 -256 768
WIRE -192 768 -224 768
WIRE -80 768 -112 768
WIRE -368 800 -368 768
WIRE -160 880 -160 864
WIRE -224 896 -224 768
WIRE -192 896 -224 896
WIRE -80 912 -80 768
WIRE -80 912 -128 912
WIRE 0 912 -80 912
WIRE -192 928 -272 928
WIRE -160 960 -160 944
FLAG -720 32 0
FLAG -720 -80 IN
FLAG -368 -128 0
FLAG -160 -64 +V
FLAG -160 32 -V
FLAG -720 304 0
FLAG -720 192 +V
FLAG -592 304 0
FLAG -592 192 -V
FLAG -272 0 IN
FLAG 0 -16 OUT_1
FLAG -368 176 0
FLAG -160 240 +V
FLAG -160 336 -V
FLAG -272 304 IN
FLAG 0 288 OUT_2
FLAG -368 496 0
FLAG -160 560 +V
FLAG -160 656 -V
FLAG -272 624 IN
FLAG 0 608 OUT_3a
FLAG -368 800 0
FLAG -160 864 +V
FLAG -160 960 -V
FLAG -272 928 IN
FLAG 0 912 OUT_3b
SYMBOL voltage -720 -80 R0
WINDOW 123 46 76 Left 2
WINDOW 39 0 0 Left 2
WINDOW 3 -27 152 Left 2
SYMATTR Value2 AC 1 0
SYMATTR Value PULSE(0 1 0 1n 1n 5u 10u)
SYMATTR InstName V1
SYMBOL Opamps\\UniversalOpamp2 -160 -16 R0
WINDOW 38 21 32 Left 2
SYMATTR InstName U1
SYMATTR SpiceModel level.1
SYMBOL Misc\\EuropeanResistor -208 -144 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName Rb
SYMATTR Value 10k
SYMBOL Misc\\EuropeanResistor -352 -144 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName Ra
SYMATTR Value 10k
SYMBOL voltage -720 192 R0
SYMATTR InstName V2
SYMATTR Value 15
SYMBOL voltage -592 192 R0
SYMATTR InstName V3
SYMATTR Value -15
SYMBOL Opamps\\UniversalOpamp2 -160 288 R0
WINDOW 38 21 32 Left 2
SYMATTR InstName U2
SYMBOL Misc\\EuropeanResistor -208 160 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName Rb1
SYMATTR Value 10k
SYMBOL Misc\\EuropeanResistor -352 160 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName Ra1
SYMATTR Value 10k
SYMBOL Opamps\\UniversalOpamp2 -160 608 R0
WINDOW 38 21 32 Left 2
SYMATTR InstName U3
SYMATTR SpiceModel level.3a
SYMBOL Misc\\EuropeanResistor -208 480 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName Rb2
SYMATTR Value 10k
SYMBOL Misc\\EuropeanResistor -352 480 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName Ra2
SYMATTR Value 10k
SYMBOL Opamps\\UniversalOpamp2 -160 912 R0
WINDOW 38 21 32 Left 2
SYMATTR InstName U4
SYMATTR SpiceModel level.3b
SYMBOL Misc\\EuropeanResistor -208 784 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName Rb3
SYMATTR Value 10k
SYMBOL Misc\\EuropeanResistor -352 784 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName Ra3
SYMATTR Value 10k
TEXT -752 -248 Left 2 !;ac oct 1000 10 10Meg
TEXT -752 -216 Left 2 !.tran 0 1u 0 1n