* SPICE netlist
V1 Input1 0 3V
V2 Input1 0 2V
R1 N001 Input1 1K
R2 N011 Input1 1K
R3 N004 N003 1K
R4 N003 N002 1K
R5 N003 N012 1K
V3 N016 0 1V
R6 N015 N016 1k
R7 N006 N005 1k
R8 N005 N004 1k
R9 N005 N013 1k
R10 N008 N007 1k
R11 N007 N006 1k
R12 N010 N009 1k
R13 Output N014 1k
R14 N014 N010 1k
Q1 N001 0 N002 0 NPN
Q2 N011 0 N012 0 NPN
Q3 N015 0 N013 0 NPN
Q4 N009 0 N008 0 PNP
XU9 0 N001 +12 -12 N002 LT1001 ;pnba In+)In-)V+)V-)OUT
XU10 0 N011 +12 -12 N012 LT1001 ;pnba In+)In-)V+)V-)OUT
XU11 0 N015 +12 -12 N013 LT1001 ;pnba In+)In-)V+)V-)OUT
XU12 0 N003 +12 -12 N004 LT1001 ;pnba In+)In-)V+)V-)OUT
XU13 0 N005 +12 -12 N006 LT1001 ;pnba In+)In-)V+)V-)OUT
XU14 0 N007 +12 -12 N008 LT1001 ;pnba In+)In-)V+)V-)OUT
XU16 0 N014 +12 -12 Output LT1001 ;pnba In+)In-)V+)V-)OUT
XU15 0 N009 +12 -12 N010 LT1001 ;pnba In+)In-)V+)V-)OUT
V4 -12 0 -12V
V5 +12 0 12V
.tran 10ms

* LTspice schematic (.asc)
Version 4
SHEET 1 2208 944
WIRE 896 -424 896 -440
WIRE -720 -184 -752 -184
WIRE -544 -184 -624 -184
WIRE -352 -120 -400 -120
WIRE -224 -120 -272 -120
WIRE 48 -104 0 -104
WIRE 176 -104 128 -104
WIRE 352 -88 304 -88
WIRE 480 -88 432 -88
WIRE 752 -72 704 -72
WIRE 880 -72 832 -72
WIRE -944 -56 -1056 -56
WIRE -944 -40 -944 -56
WIRE -864 -40 -944 -40
WIRE -752 -40 -752 -184
WIRE -752 -40 -784 -40
WIRE -704 -40 -752 -40
WIRE -544 -24 -544 -184
WIRE -544 -24 -640 -24
WIRE -496 -24 -544 -24
WIRE -400 -24 -400 -120
WIRE -400 -24 -416 -24
WIRE -352 -24 -400 -24
WIRE -704 -8 -736 -8
WIRE -224 -8 -224 -120
WIRE -224 -8 -288 -8
WIRE -96 -8 -224 -8
WIRE 0 -8 0 -104
WIRE 0 -8 -16 -8
WIRE 48 -8 0 -8
WIRE -736 8 -736 -8
WIRE -400 8 -400 -24
WIRE -400 8 -416 8
WIRE -352 8 -384 8
WIRE 176 8 176 -104
WIRE 176 8 112 8
WIRE 208 8 176 8
WIRE 304 8 304 -88
WIRE 304 8 288 8
WIRE 352 8 304 8
WIRE 0 24 0 -8
WIRE 0 24 -16 24
WIRE 48 24 16 24
WIRE 480 24 480 -88
WIRE 480 24 416 24
WIRE 560 24 480 24
WIRE 704 24 704 -72
WIRE 704 24 656 24
WIRE 752 24 704 24
WIRE -384 40 -384 8
WIRE 352 40 320 40
WIRE 880 40 880 -72
WIRE 880 40 816 40
WIRE 16 56 16 24
WIRE 704 56 704 24
WIRE 752 56 720 56
WIRE 320 72 320 40
WIRE 720 72 720 56
WIRE -720 88 -768 88
WIRE -560 88 -624 88
WIRE -496 88 -560 88
WIRE -416 88 -416 8
WIRE -96 104 -160 104
WIRE -16 104 -16 24
WIRE 880 120 880 40
WIRE 880 120 672 120
WIRE 672 184 672 120
WIRE 672 184 624 184
WIRE 768 184 720 184
WIRE 896 184 848 184
WIRE -944 216 -1104 216
WIRE -864 216 -944 216
WIRE -848 216 -864 216
WIRE -768 216 -768 88
WIRE -768 216 -784 216
WIRE -704 216 -768 216
WIRE -560 232 -560 88
WIRE -560 232 -640 232
WIRE -704 248 -736 248
WIRE -448 248 -480 248
WIRE -272 248 -352 248
WIRE -160 248 -160 104
WIRE -160 248 -272 248
WIRE -736 264 -736 248
WIRE 624 280 624 184
WIRE 720 280 720 184
WIRE 720 280 704 280
WIRE 768 280 720 280
WIRE 896 296 896 184
WIRE 896 296 832 296
WIRE 1056 296 896 296
WIRE 768 312 736 312
WIRE 1056 312 1056 296
WIRE 1104 312 1056 312
WIRE 736 344 736 312
WIRE -592 392 -672 392
WIRE -480 392 -480 248
WIRE -480 392 -512 392
WIRE -432 392 -480 392
WIRE -272 408 -272 248
WIRE -272 408 -368 408
WIRE -432 424 -464 424
WIRE -464 440 -464 424
FLAG -672 -120 0
FLAG -672 152 0
FLAG -736 8 0
FLAG -736 264 0
FLAG -944 40 0
FLAG -944 296 0
FLAG -384 40 0
FLAG -400 312 0
FLAG -464 440 0
FLAG -672 472 0
FLAG 16 56 0
FLAG 320 72 0
FLAG 608 88 0
FLAG 720 72 0
FLAG 736 344 0
FLAG 1104 312 Output
FLAG -1056 -56 Input1
FLAG -1104 216 Input1
FLAG 896 -360 0
FLAG 1104 -376 0
FLAG 1104 -456 +12
FLAG 784 8 +12
FLAG 800 264 +12
FLAG 384 -8 +12
FLAG 80 -24 +12
FLAG -320 -40 +12
FLAG -672 -56 +12
FLAG -672 200 +12
FLAG -400 376 +12
FLAG 896 -440 -12
FLAG -672 8 -12
FLAG -320 24 -12
FLAG -672 264 -12
FLAG -400 440 -12
FLAG 80 40 -12
FLAG 384 56 -12
FLAG 784 72 -12
FLAG 800 328 -12
SYMBOL voltage -944 -56 R0
SYMATTR InstName V1
SYMATTR Value 3V
SYMBOL voltage -944 200 R0
SYMATTR InstName V2
SYMATTR Value 2V
SYMBOL res -768 -56 R90
SYMATTR InstName R1
SYMATTR Value 1K
SYMBOL res -768 200 R90
SYMATTR InstName R2
SYMATTR Value 1K
SYMBOL res -256 -136 R90
SYMATTR InstName R3
SYMATTR Value 1K
SYMBOL res -400 -40 R90
SYMATTR InstName R4
SYMATTR Value 1K
SYMBOL res -400 72 R90
SYMATTR InstName R5
SYMATTR Value 1K
SYMBOL voltage -672 376 R0
SYMATTR InstName V3
SYMATTR Value 1V
SYMBOL res -496 376 R90
SYMATTR InstName R6
SYMATTR Value 1k
SYMBOL res 144 -120 R90
SYMATTR InstName R7
SYMATTR Value 1k
SYMBOL res 0 -24 R90
SYMATTR InstName R8
SYMATTR Value 1k
SYMBOL res 0 88 R90
SYMATTR InstName R9
SYMATTR Value 1k
SYMBOL res 448 -104 R90
SYMATTR InstName R10
SYMATTR Value 1k
SYMBOL res 304 -8 R90
SYMATTR InstName R11
SYMATTR Value 1k
SYMBOL res 848 -88 R90
SYMATTR InstName R12
SYMATTR Value 1k
SYMBOL res 864 168 R90
SYMATTR InstName R13
SYMATTR Value 1k
SYMBOL res 720 264 R90
SYMATTR InstName R14
SYMATTR Value 1k
SYMBOL npn -720 -120 R270
SYMATTR InstName Q1
SYMBOL npn -720 152 R270
SYMATTR InstName Q2
SYMBOL npn -448 312 R270
SYMATTR InstName Q3
SYMBOL pnp 656 88 M270
SYMATTR InstName Q4
SYMBOL Opamps\\OP07 -672 -88 R0
SYMATTR InstName U9
SYMBOL Opamps\\OP07 -672 168 R0
SYMATTR InstName U10
SYMBOL Opamps\\OP07 -400 344 R0
SYMATTR InstName U11
SYMBOL Opamps\\OP07 -320 -72 R0
SYMATTR InstName U12
SYMBOL Opamps\\OP07 80 -56 R0
SYMATTR InstName U13
SYMBOL Opamps\\OP07 384 -40 R0
SYMATTR InstName U14
SYMBOL Opamps\\OP07 800 232 R0
SYMATTR InstName U16
SYMBOL Opamps\\OP07 784 -24 R0
SYMATTR InstName U15
SYMBOL voltage 896 -456 R0
SYMATTR InstName V4
SYMATTR Value -12V
SYMBOL voltage 1104 -472 R0
SYMATTR InstName V5
SYMATTR Value 12V