* SPICE netlist
XU1 0 N001 + - Out LMX24_LM2902 ;pnba In+)In-)V+)V-)OUT
R11 N001 N003 1Meg
R12 N001 N006 1Meg
V3 + 0 10
V4 0 - 10
R1 N002 N001 100k
R2 Out N002 100k
R3 0 N002 330
V1 N003 0 AC 0.5 Rser=50
V2 N006 0 AC 0 Rser=50
XU2 0 N009 + - Out2 LMX24_LM2902 ;pnba In+)In-)V+)V-)OUT
R4 N009 N011 1Meg
R5 N009 N014 1Meg
R6 N010 N009 100k
R7 Out2 N010 100k
R8 0 N010 330
V5 N011 0 AC 0.5 Rser=50
V6 N014 0 AC 0.5 Rser=50
XU3 0 N017 + - Out3 LMX24_LM2902 ;pnba In+)In-)V+)V-)OUT
R9 N017 N019 1Meg
R10 N017 N022 1Meg
R13 N018 N017 100k
R14 Out3 N018 100k
R15 0 N018 330
V7 N019 0 AC 0.5 Rser=50
V8 N022 0 AC -0.5 Rser=50
XU4 0 N004 + - Out4 LMX24_LM2902 ;pnba In+)In-)V+)V-)OUT
R16 N004 N007 1Meg
R17 N004 N008 1Meg
R18 N005 N004 100k
R19 Out4 N005 100k
R20 0 N005 330
V9 N007 0 AC 0.5 Rser=100k
V10 N008 0 AC 0 Rser=100k
XU5 0 N012 + - Out5 LMX24_LM2902 ;pnba In+)In-)V+)V-)OUT
R21 N012 N015 1Meg
R22 N012 N016 1Meg
R23 N013 N012 100k
R24 Out5 N013 100k
R25 0 N013 330
V11 N015 0 AC 0.5 Rser=100k
V12 N016 0 AC 0.5 Rser=100k
XU6 0 N020 + - Out6 LMX24_LM2902 ;pnba In+)In-)V+)V-)OUT
R26 N020 N023 1Meg
R27 N020 N024 1Meg
R28 N021 N020 100k
R29 Out6 N021 100k
R30 0 N021 330
V13 N023 0 AC 0.5 Rser=100k
V14 N024 0 AC -0.5 Rser=100k
.include LM324.lib
.ac dec 100 1 1meg

* LTspice schematic (.asc)
Version 4.1
SHEET 1 1840 1696
WIRE -504 -720 -536 -720
WIRE -392 -720 -424 -720
WIRE -360 -720 -392 -720
WIRE -264 -720 -280 -720
WIRE 408 -720 408 -752
WIRE 504 -720 408 -720
WIRE -392 -704 -392 -720
WIRE 504 -704 504 -720
WIRE 408 -688 408 -720
WIRE -392 -608 -392 -624
WIRE -680 -560 -824 -560
WIRE -536 -560 -536 -720
WIRE -536 -560 -600 -560
WIRE -360 -560 -536 -560
WIRE 648 -560 616 -560
WIRE 760 -560 728 -560
WIRE 792 -560 760 -560
WIRE 888 -560 872 -560
WIRE -824 -544 -824 -560
WIRE -264 -544 -264 -720
WIRE -264 -544 -296 -544
WIRE -232 -544 -264 -544
WIRE 760 -544 760 -560
WIRE -360 -528 -392 -528
WIRE -680 -496 -728 -496
WIRE -536 -496 -536 -560
WIRE -536 -496 -600 -496
WIRE -728 -480 -728 -496
WIRE 760 -448 760 -464
WIRE -824 -432 -824 -464
WIRE 472 -400 328 -400
WIRE 616 -400 616 -560
WIRE 616 -400 552 -400
WIRE 792 -400 616 -400
WIRE -392 -384 -392 -528
WIRE 328 -384 328 -400
WIRE 888 -384 888 -560
WIRE 888 -384 856 -384
WIRE 920 -384 888 -384
WIRE 792 -368 760 -368
WIRE -728 -352 -728 -400
WIRE 472 -336 424 -336
WIRE 616 -336 616 -400
WIRE 616 -336 552 -336
WIRE 424 -320 424 -336
WIRE 328 -272 328 -304
WIRE 760 -224 760 -368
WIRE 424 -192 424 -240
WIRE -584 -176 -616 -176
WIRE -472 -176 -504 -176
WIRE -440 -176 -472 -176
WIRE -344 -176 -360 -176
WIRE -472 -160 -472 -176
WIRE -472 -64 -472 -80
WIRE -760 -16 -904 -16
WIRE -616 -16 -616 -176
WIRE -616 -16 -680 -16
WIRE -440 -16 -616 -16
WIRE 568 -16 536 -16
WIRE 680 -16 648 -16
WIRE 712 -16 680 -16
WIRE 808 -16 792 -16
WIRE -904 0 -904 -16
WIRE -344 0 -344 -176
WIRE -344 0 -376 0
WIRE -312 0 -344 0
WIRE 680 0 680 -16
WIRE -440 16 -472 16
WIRE -760 48 -808 48
WIRE -616 48 -616 -16
WIRE -616 48 -680 48
WIRE -808 64 -808 48
WIRE 680 96 680 80
WIRE -904 112 -904 80
WIRE 392 144 248 144
WIRE 536 144 536 -16
WIRE 536 144 472 144
WIRE 712 144 536 144
WIRE -472 160 -472 16
WIRE 248 160 248 144
WIRE 808 160 808 -16
WIRE 808 160 776 160
WIRE 840 160 808 160
WIRE 712 176 680 176
WIRE -808 192 -808 144
WIRE 392 208 344 208
WIRE 536 208 536 144
WIRE 536 208 472 208
WIRE 344 224 344 208
WIRE 248 272 248 240
WIRE -600 320 -632 320
WIRE -488 320 -520 320
WIRE -456 320 -488 320
WIRE -360 320 -376 320
WIRE 680 320 680 176
WIRE -488 336 -488 320
WIRE 344 352 344 304
WIRE -488 432 -488 416
WIRE -776 480 -920 480
WIRE -632 480 -632 320
WIRE -632 480 -696 480
WIRE -456 480 -632 480
WIRE 552 480 520 480
WIRE 664 480 632 480
WIRE 696 480 664 480
WIRE 792 480 776 480
WIRE -920 496 -920 480
WIRE -360 496 -360 320
WIRE -360 496 -392 496
WIRE -328 496 -360 496
WIRE 664 496 664 480
WIRE -456 512 -488 512
WIRE -776 544 -824 544
WIRE -632 544 -632 480
WIRE -632 544 -696 544
WIRE -824 560 -824 544
WIRE 664 592 664 576
WIRE -920 608 -920 576
WIRE 376 640 232 640
WIRE 520 640 520 480
WIRE 520 640 456 640
WIRE 696 640 520 640
WIRE -488 656 -488 512
WIRE 232 656 232 640
WIRE 792 656 792 480
WIRE 792 656 760 656
WIRE 824 656 792 656
WIRE 696 672 664 672
WIRE -824 688 -824 640
WIRE 376 704 328 704
WIRE 520 704 520 640
WIRE 520 704 456 704
WIRE 328 720 328 704
WIRE 232 768 232 736
WIRE 664 816 664 672
WIRE 328 848 328 800
FLAG -232 -544 Out
IOPIN 288 112 Out
FLAG -328 -576 +
FLAG -328 -512 -
FLAG 408 -832 +
FLAG 408 -608 -
FLAG -824 -432 0
FLAG -728 -352 0
FLAG 504 -704 0
FLAG -392 -608 0
FLAG -392 -384 0
FLAG -312 0 Out2
IOPIN 208 656 Out
FLAG -408 -32 +
FLAG -408 32 -
FLAG -904 112 0
FLAG -808 192 0
FLAG -472 -64 0
FLAG -472 160 0
FLAG -328 496 Out3
IOPIN 192 1152 Out
FLAG -424 464 +
FLAG -424 528 -
FLAG -920 608 0
FLAG -824 688 0
FLAG -488 432 0
FLAG -488 656 0
FLAG 920 -384 Out4
IOPIN 1440 272 Out
FLAG 824 -416 +
FLAG 824 -352 -
FLAG 328 -272 0
FLAG 424 -192 0
FLAG 760 -448 0
FLAG 760 -224 0
FLAG 840 160 Out5
IOPIN 1360 816 Out
FLAG 744 128 +
FLAG 744 192 -
FLAG 248 272 0
FLAG 344 352 0
FLAG 680 96 0
FLAG 680 320 0
FLAG 824 656 Out6
IOPIN 1344 1312 Out
FLAG 728 624 +
FLAG 728 688 -
FLAG 232 768 0
FLAG 328 848 0
FLAG 664 592 0
FLAG 664 816 0
SYMBOL OpAmps\\opamp2 -328 -608 R0
SYMATTR InstName U1
SYMATTR Value LMX24_LM2902
SYMBOL res -584 -576 R90
SYMATTR InstName R11
SYMATTR Value 1Meg
SYMBOL res -584 -512 R90
SYMATTR InstName R12
SYMATTR Value 1Meg
SYMBOL voltage 408 -848 R0
SYMATTR InstName V3
SYMATTR Value 10
SYMBOL voltage 408 -704 R0
SYMATTR InstName V4
SYMATTR Value 10
SYMBOL res -408 -736 R90
SYMATTR InstName R1
SYMATTR Value 100k
SYMBOL res -264 -736 R90
SYMATTR InstName R2
SYMATTR Value 100k
SYMBOL res -376 -608 R180
SYMATTR InstName R3
SYMATTR Value 330
SYMBOL voltage -824 -560 R0
SYMATTR InstName V1
SYMATTR Value ""
SYMATTR Value2 AC 0.5
SYMATTR SpiceLine Rser=50
SYMBOL voltage -728 -496 R0
SYMATTR InstName V2
SYMATTR Value ""
SYMATTR Value2 AC 0
SYMATTR SpiceLine Rser=50
SYMBOL OpAmps\\opamp2 -408 -64 R0
SYMATTR InstName U2
SYMATTR Value LMX24_LM2902
SYMBOL res -664 -32 R90
SYMATTR InstName R4
SYMATTR Value 1Meg
SYMBOL res -664 32 R90
SYMATTR InstName R5
SYMATTR Value 1Meg
SYMBOL res -488 -192 R90
SYMATTR InstName R6
SYMATTR Value 100k
SYMBOL res -344 -192 R90
SYMATTR InstName R7
SYMATTR Value 100k
SYMBOL res -456 -64 R180
SYMATTR InstName R8
SYMATTR Value 330
SYMBOL voltage -904 -16 R0
SYMATTR InstName V5
SYMATTR Value ""
SYMATTR Value2 AC 0.5
SYMATTR SpiceLine Rser=50
SYMBOL voltage -808 48 R0
SYMATTR InstName V6
SYMATTR Value ""
SYMATTR Value2 AC 0.5
SYMATTR SpiceLine Rser=50
SYMBOL OpAmps\\opamp2 -424 432 R0
SYMATTR InstName U3
SYMATTR Value LMX24_LM2902
SYMBOL res -680 464 R90
SYMATTR InstName R9
SYMATTR Value 1Meg
SYMBOL res -680 528 R90
SYMATTR InstName R10
SYMATTR Value 1Meg
SYMBOL res -504 304 R90
SYMATTR InstName R13
SYMATTR Value 100k
SYMBOL res -360 304 R90
SYMATTR InstName R14
SYMATTR Value 100k
SYMBOL res -472 432 R180
SYMATTR InstName R15
SYMATTR Value 330
SYMBOL voltage -920 480 R0
SYMATTR InstName V7
SYMATTR Value ""
SYMATTR Value2 AC 0.5
SYMATTR SpiceLine Rser=50
SYMBOL voltage -824 544 R0
SYMATTR InstName V8
SYMATTR Value ""
SYMATTR Value2 AC -0.5
SYMATTR SpiceLine Rser=50
SYMBOL OpAmps\\opamp2 824 -448 R0
SYMATTR InstName U4
SYMATTR Value LMX24_LM2902
SYMBOL res 568 -416 R90
SYMATTR InstName R16
SYMATTR Value 1Meg
SYMBOL res 568 -352 R90
SYMATTR InstName R17
SYMATTR Value 1Meg
SYMBOL res 744 -576 R90
SYMATTR InstName R18
SYMATTR Value 100k
SYMBOL res 888 -576 R90
SYMATTR InstName R19
SYMATTR Value 100k
SYMBOL res 776 -448 R180
SYMATTR InstName R20
SYMATTR Value 330
SYMBOL voltage 328 -400 R0
SYMATTR InstName V9
SYMATTR Value ""
SYMATTR Value2 AC 0.5
SYMATTR SpiceLine Rser=100k
SYMBOL voltage 424 -336 R0
SYMATTR InstName V10
SYMATTR Value ""
SYMATTR Value2 AC 0
SYMATTR SpiceLine Rser=100k
SYMBOL OpAmps\\opamp2 744 96 R0
SYMATTR InstName U5
SYMATTR Value LMX24_LM2902
SYMBOL res 488 128 R90
SYMATTR InstName R21
SYMATTR Value 1Meg
SYMBOL res 488 192 R90
SYMATTR InstName R22
SYMATTR Value 1Meg
SYMBOL res 664 -32 R90
SYMATTR InstName R23
SYMATTR Value 100k
SYMBOL res 808 -32 R90
SYMATTR InstName R24
SYMATTR Value 100k
SYMBOL res 696 96 R180
SYMATTR InstName R25
SYMATTR Value 330
SYMBOL voltage 248 144 R0
SYMATTR InstName V11
SYMATTR Value ""
SYMATTR Value2 AC 0.5
SYMATTR SpiceLine Rser=100k
SYMBOL voltage 344 208 R0
SYMATTR InstName V12
SYMATTR Value ""
SYMATTR Value2 AC 0.5
SYMATTR SpiceLine Rser=100k
SYMBOL OpAmps\\opamp2 728 592 R0
SYMATTR InstName U6
SYMATTR Value LMX24_LM2902
SYMBOL res 472 624 R90
SYMATTR InstName R26
SYMATTR Value 1Meg
SYMBOL res 472 688 R90
SYMATTR InstName R27
SYMATTR Value 1Meg
SYMBOL res 648 464 R90
SYMATTR InstName R28
SYMATTR Value 100k
SYMBOL res 792 464 R90
SYMATTR InstName R29
SYMATTR Value 100k
SYMBOL res 680 592 R180
SYMATTR InstName R30
SYMATTR Value 330
SYMBOL voltage 232 640 R0
SYMATTR InstName V13
SYMATTR Value ""
SYMATTR Value2 AC 0.5
SYMATTR SpiceLine Rser=100k
SYMBOL voltage 328 704 R0
SYMATTR InstName V14
SYMATTR Value ""
SYMATTR Value2 AC -0.5
SYMATTR SpiceLine Rser=100k