* SPICE netlist
Q1 N019 2 3 0 NP
Q2 N019 3 2 0 NP
Q3 N017 2 N025 0 SB
Q4 N021 3 N026 0 SB
Q5 N028 N030 N031 0 SB
Q6 N008 N015 N017 0 SB
Q7 1 N015 N021 0 SB
R1 N026 N028 2K
R3 7 N007 20K
Q8 N012 N008 N004 0 PN
Q9 N008 N008 N006 0 PN
R4 7 N004 10K
R5 7 N006 20K
Q10 N011 1 N004 0 PN
Q11 1 1 N007 0 PN
R6 N031 N032 6.4K
R7 N025 N028 2K
R8 N019 N020 50K
R9 N030 N032 60K
Q12 N001 N027 N030 0 SB
Q14 4 N028 N020 0 PN
Q15 N012 N012 N014 0 NP
Q16 N011 N012 N014 0 NP
R2 7 N003 10K
Q17 N015 N001 N003 0 PN
Q18 N015 N015 N020 0 SB
R10 8 N011 5.6K
C1 8 1 10p
Q13 N001 N018 N022 0 SB
R11 N018 N027 940
R12 N032 N033 500
R13 N022 N033 20K
Q19 N027 N022 N033 0 NP
J1 N001 4 N018 NJ
R14 N033 4 1K
R15 N023 N022 20K
Q20 N001 N001 7 0 PN
Q21 N002 N001 7 0 PN
Q22 7 N002 N009 0 SB
Q23 N009 N011 N014 0 NP
R16 N002 N005 2K
Q24 N005 N002 N013 0 SB
Q25 4 N014 N013 0 PN
Q26 N005 N010 6 0 SB
Q27 7 N005 N010 0 SB
Q28 4 N014 N016 0 PN
R17 N010 N016 240
R18 N010 6 90
Q29 N014 N023 N029 0 SB
V1 7 0 +15
V2 4 0 -15
R19 N029 4 820
R20 6 2 10K
R21 2 0 1K
R22 3 N024 1K
V3 N024 0 SINE(0 1.2 1K)
.tran 10m startup

* LTspice schematic (.asc)
Version 4
SHEET 1 2560 1728
WIRE 96 -848 -1056 -848
WIRE 1280 -848 176 -848
WIRE -208 -800 -368 -800
WIRE 32 -800 -144 -800
WIRE -368 -736 -368 -800
WIRE 32 -736 32 -800
WIRE -464 -672 -768 -672
WIRE -256 -672 -464 -672
WIRE -96 -672 -256 -672
WIRE 192 -672 -96 -672
WIRE 384 -672 192 -672
WIRE 976 -672 384 -672
WIRE 1120 -672 976 -672
WIRE 1184 -672 1120 -672
WIRE 192 -656 192 -672
WIRE 192 -656 144 -656
WIRE 272 -656 192 -656
WIRE 1184 -656 1184 -672
WIRE 144 -640 144 -656
WIRE 272 -640 272 -656
WIRE -464 -624 -464 -672
WIRE -256 -624 -256 -672
WIRE -96 -624 -96 -672
WIRE -768 -592 -768 -672
WIRE 80 -592 0 -592
WIRE 208 -592 80 -592
WIRE 1184 -560 1184 -576
WIRE 272 -528 272 -544
WIRE 480 -528 272 -528
WIRE -96 -512 -96 -544
WIRE 384 -512 384 -672
WIRE 976 -512 976 -672
WIRE -256 -464 -256 -544
WIRE -256 -464 -576 -464
WIRE 0 -464 0 -592
WIRE 0 -464 -32 -464
WIRE 144 -464 144 -544
WIRE 144 -464 0 -464
WIRE 480 -464 480 -528
WIRE 480 -464 448 -464
WIRE 560 -464 480 -464
WIRE 720 -464 640 -464
WIRE 848 -464 720 -464
WIRE 912 -464 848 -464
WIRE -768 -416 -768 -512
WIRE -576 -416 -576 -464
WIRE -464 -416 -464 -544
WIRE -256 -416 -256 -464
WIRE 32 -416 32 -736
WIRE 720 -400 720 -464
WIRE 848 -400 848 -464
WIRE -672 -368 -704 -368
WIRE -640 -368 -672 -368
WIRE -368 -368 -368 -736
WIRE -368 -368 -400 -368
WIRE -320 -368 -368 -368
WIRE 384 -352 384 -416
WIRE 480 -352 480 -464
WIRE 656 -352 480 -352
WIRE 976 -352 976 -416
WIRE 976 -352 912 -352
WIRE 1008 -352 976 -352
WIRE 1120 -352 1088 -352
WIRE 1280 -352 1280 -848
WIRE 1280 -352 1120 -352
WIRE -768 -304 -768 -320
WIRE -672 -304 -672 -368
WIRE -672 -304 -768 -304
WIRE -464 -304 -464 -320
WIRE -368 -304 -368 -368
WIRE -368 -304 -464 -304
WIRE -256 -304 -256 -320
WIRE 32 -304 32 -336
WIRE 32 -304 -256 -304
WIRE 320 -304 32 -304
WIRE -576 -272 -576 -320
WIRE -272 -272 -576 -272
WIRE -160 -272 -272 -272
WIRE 848 -256 848 -304
WIRE 1120 -256 1120 -352
WIRE 1120 -256 848 -256
WIRE 976 -224 976 -352
WIRE 720 -208 720 -304
WIRE -272 -192 -272 -272
WIRE 32 -192 32 -304
WIRE -768 -176 -768 -304
WIRE -464 -176 -464 -304
WIRE 656 -160 624 -160
WIRE -160 -144 -160 -272
WIRE -160 -144 -208 -144
WIRE -32 -144 -160 -144
WIRE -624 -128 -704 -128
WIRE -528 -128 -624 -128
WIRE 976 -96 976 -144
WIRE -272 -48 -272 -96
WIRE 32 -48 32 -96
WIRE 32 -48 -272 -48
WIRE 384 -48 384 -256
WIRE 384 -48 32 -48
WIRE 624 -48 624 -160
WIRE 624 -48 384 -48
WIRE 912 -48 624 -48
WIRE -768 -32 -768 -80
WIRE -768 -32 -816 -32
WIRE -624 -16 -624 -128
WIRE -96 -16 -96 -416
WIRE -96 -16 -624 -16
WIRE -16 -16 -96 -16
WIRE -816 16 -816 -32
WIRE -96 16 -96 -16
WIRE 144 16 144 -464
WIRE 144 16 32 16
WIRE 240 16 144 16
WIRE 416 16 240 16
WIRE -1184 64 -1280 64
WIRE -1056 64 -1056 -848
WIRE -1056 64 -1104 64
WIRE -960 64 -1056 64
WIRE -896 64 -960 64
WIRE -880 64 -896 64
WIRE -16 64 -16 -16
WIRE -16 64 -32 64
WIRE 240 64 240 16
WIRE 544 80 464 80
WIRE 416 112 304 112
WIRE -544 144 -752 144
WIRE -336 144 -544 144
WIRE -96 144 -96 112
WIRE -96 144 -256 144
WIRE -752 160 -752 144
WIRE -544 160 -544 144
WIRE 416 160 416 112
WIRE -672 208 -688 208
WIRE -608 208 -624 208
WIRE -896 272 -896 64
WIRE -752 272 -752 256
WIRE -752 272 -896 272
WIRE -624 272 -624 208
WIRE -624 272 -752 272
WIRE 624 272 624 -48
WIRE -672 288 -672 208
WIRE -544 288 -544 256
WIRE -544 288 -672 288
WIRE -464 288 -464 -80
WIRE 240 320 240 160
WIRE 432 320 240 320
WIRE 560 320 512 320
WIRE -1184 336 -1280 336
WIRE -960 336 -1104 336
WIRE -544 336 -544 288
WIRE -544 336 -960 336
WIRE -528 336 -544 336
WIRE -1280 384 -1280 336
WIRE -816 384 -816 112
WIRE 32 384 32 16
WIRE -464 400 -464 384
WIRE 416 432 416 240
WIRE 416 432 96 432
WIRE -96 448 -96 144
WIRE -816 496 -816 464
WIRE -464 496 -464 480
WIRE -464 496 -816 496
WIRE -160 496 -464 496
WIRE 624 512 624 368
WIRE -1280 528 -1280 464
WIRE -464 560 -464 496
WIRE -96 560 -96 544
WIRE 544 560 544 80
WIRE 544 560 -96 560
WIRE 416 576 416 432
WIRE 32 608 32 480
WIRE 32 608 -400 608
WIRE 240 624 240 320
WIRE 352 624 240 624
WIRE 32 640 32 608
WIRE 240 640 240 624
WIRE -464 752 -464 656
WIRE -240 752 -464 752
WIRE 32 752 32 720
WIRE 32 752 -160 752
WIRE 112 752 32 752
WIRE 240 752 240 720
WIRE 240 752 192 752
WIRE 416 752 416 672
WIRE 416 752 240 752
WIRE 432 752 416 752
WIRE 544 752 544 560
WIRE 544 752 512 752
WIRE 624 752 624 592
WIRE 624 752 544 752
WIRE 720 752 720 -112
WIRE 720 752 624 752
WIRE 976 752 976 0
WIRE 976 752 720 752
WIRE 1120 752 976 752
WIRE 1184 752 1120 752
WIRE 1184 768 1184 752
WIRE 1184 864 1184 848
FLAG -960 64 2
FLAG -960 336 3
FLAG -368 -736 1
FLAG 32 -736 8
FLAG 1120 -352 6
FLAG 1120 -672 7
FLAG 1120 752 4
FLAG 1184 -560 0
FLAG 1184 864 0
FLAG -1280 528 0
FLAG -1280 64 0
SYMBOL npn -608 160 R0
SYMATTR InstName Q1
SYMATTR Value NP
SYMBOL npn -688 160 M0
SYMATTR InstName Q2
SYMATTR Value NP
SYMBOL NPN3 -880 16 R0
SYMATTR InstName Q3
SYMATTR Value SB
SYMBOL npn3 -528 288 R0
SYMATTR InstName Q4
SYMATTR Value SB
SYMBOL npn3 -400 560 M0
SYMATTR InstName Q5
SYMATTR Value SB
SYMBOL npn3 -704 -176 M0
SYMATTR InstName Q6
SYMATTR Value SB
SYMBOL npn3 -528 -176 R0
SYMATTR InstName Q7
SYMATTR Value SB
SYMBOL res -480 384 R0
SYMATTR InstName R1
SYMATTR Value 2K
SYMBOL res -480 -640 R0
SYMATTR InstName R3
SYMATTR Value 20K
SYMBOL pnp -640 -320 M180
SYMATTR InstName Q8
SYMATTR Value PN
SYMBOL pnp -704 -320 R180
SYMATTR InstName Q9
SYMATTR Value PN
SYMBOL res -272 -640 R0
SYMATTR InstName R4
SYMATTR Value 10K
SYMBOL res -784 -608 R0
SYMATTR InstName R5
SYMATTR Value 20K
SYMBOL pnp -320 -320 M180
SYMATTR InstName Q10
SYMATTR Value PN
SYMBOL pnp -400 -320 R180
SYMATTR InstName Q11
SYMATTR Value PN
SYMBOL res -256 768 R270
SYMATTR InstName R6
SYMATTR Value 6.4K
SYMBOL res -832 368 R0
SYMATTR InstName R7
SYMATTR Value 2K
SYMBOL res -352 160 R270
SYMATTR InstName R8
SYMATTR Value 50K
SYMBOL res 16 624 R0
SYMATTR InstName R9
SYMATTR Value 60K
SYMBOL npn3 96 384 M0
SYMATTR InstName Q12
SYMATTR Value SB
SYMBOL pnp -160 544 M180
SYMATTR InstName Q14
SYMATTR Value PN
SYMBOL npn -208 -192 M0
SYMATTR InstName Q15
SYMATTR Value NP
SYMBOL npn -32 -192 R0
SYMATTR InstName Q16
SYMATTR Value NP
SYMBOL res -112 -640 R0
SYMATTR InstName R2
SYMATTR Value 10K
SYMBOL pnp -32 -416 R180
SYMATTR InstName Q17
SYMATTR Value PN
SYMBOL npn3 -32 16 M0
SYMATTR InstName Q18
SYMATTR Value SB
SYMBOL res 16 -432 R0
SYMATTR InstName R10
SYMATTR Value 5.6K
SYMBOL cap -144 -816 R90
SYMATTR InstName C1
SYMATTR Value 10p
SYMBOL npn3 304 64 M0
SYMATTR InstName Q13
SYMATTR Value SB
SYMBOL res 400 144 R0
SYMATTR InstName R11
SYMATTR Value 940
SYMBOL res 96 768 R270
SYMATTR InstName R12
SYMATTR Value 500
SYMBOL res 224 624 R0
SYMATTR InstName R13
SYMATTR Value 20K
SYMBOL npn 352 576 R0
SYMATTR InstName Q19
SYMATTR Value NP
SYMBOL NJF 464 16 M0
SYMATTR InstName J1
SYMATTR Value NJ
SYMBOL res 416 768 R270
SYMATTR InstName R14
SYMATTR Value 1K
SYMBOL res 528 304 R90
SYMATTR InstName R15
SYMATTR Value 20K
SYMBOL pnp 80 -544 M180
SYMATTR InstName Q20
SYMATTR Value PN
SYMBOL pnp 208 -544 M180
SYMATTR InstName Q21
SYMATTR Value PN
SYMBOL npn3 448 -512 M0
SYMATTR InstName Q22
SYMATTR Value SB
SYMBOL npn 320 -352 R0
SYMATTR InstName Q23
SYMATTR Value NP
SYMBOL res 544 -448 R270
SYMATTR InstName R16
SYMATTR Value 2K
SYMBOL npn3 656 -400 R0
SYMATTR InstName Q24
SYMATTR Value SB
SYMBOL pnp 656 -112 M180
SYMATTR InstName Q25
SYMATTR Value PN
SYMBOL npn3 912 -400 M0
SYMATTR InstName Q26
SYMATTR Value SB
SYMBOL npn3 912 -512 R0
SYMATTR InstName Q27
SYMATTR Value SB
SYMBOL pnp 912 0 M180
SYMATTR InstName Q28
SYMATTR Value PN
SYMBOL res 960 -240 R0
SYMATTR InstName R17
SYMATTR Value 240
SYMBOL res 992 -336 R270
SYMATTR InstName R18
SYMATTR Value 90
SYMBOL npn3 560 272 R0
SYMATTR InstName Q29
SYMATTR Value SB
SYMBOL voltage 1184 -672 R0
SYMATTR InstName V1
SYMATTR Value +15
SYMBOL voltage 1184 752 R0
SYMATTR InstName V2
SYMATTR Value -15
SYMBOL res 608 496 R0
SYMATTR InstName R19
SYMATTR Value 820
SYMBOL res 192 -864 R90
SYMATTR InstName R20
SYMATTR Value 10K
SYMBOL res -1088 48 R90
SYMATTR InstName R21
SYMATTR Value 1K
SYMBOL res -1088 320 R90
SYMATTR InstName R22
SYMATTR Value 1K
SYMBOL voltage -1280 368 R0
SYMATTR InstName V3
SYMATTR Value SINE(0 1.2 1K)