* SPICE netlist
V1 in 0 SINE(0 0.1V 0.5kHz) AC 1V
V2 8V 0 8
XUa11 N023 N011 8V -8V N011 level2 Avol=1Meg GBW=10Meg Slew=10Meg Ilimit=25m Rail=0 Vos=0 En=0 Enk=0 In=0 Ink=0 Rin=500Meg ;pnba In+)In-)V+)V-)OUT
C998 in2 in 100
C997 in3 in 100
C996 in4 in 100
C999 in1 in 100
C995 in5 in 100
C994 in6 in 100
C1 P001 in1 1
R3 0 N023 2Meg
R1 0 in1 330k
R2 N023 P001 4.99k
V3 0 -8V 8
C3 0 N023 220p
R6 N027 N011 4.99k
R5 N026 N027 51k
R9 N028 N026 1k
R8 pre_eq N028 4.99k
R4 N026 N016 20k
XUb3 0 N016 8V -8V pre_eq level2 Avol=1Meg GBW=10Meg Slew=10Meg Ilimit=25m Rail=0 Vos=0 En=0 Enk=0 In=0 Ink=0 Rin=500Meg ;pnba In+)In-)V+)V-)OUT
C8 N028 N027 22n
C10 pre_eq N016 100p
C9 N016 N012 3.3n
R7 N012 N011 51k
R10 pre_eq N012 4.99k
C12 N022 in2 100n
R19 0 N022 15k
XUa3 N022 N007 8V -8V N001 level2 Avol=1Meg GBW=10Meg Slew=10Meg Ilimit=25m Rail=0 Vos=0 En=0 Enk=0 In=0 Ink=0 Rin=500Meg ;pnba In+)In-)V+)V-)OUT
C18 N001 N007 470p
D6 N007 N001 1N4148
D3 N001 N007 QTLP690C
R22 N001 N007 20k
R33 N007 NC_01 3k
R35 N007 NC_02 634
R34 N007 N010 20k
C32 N010 0 2.2
C22 N014 N001 1
R23 N014 8V 1Meg
R26 0 N014 1Meg
Q1 N015 N014 P002 0 2N5089
C23 N015 N014 220p
R31 0 P002 2k
R32 N015 8V 3k
C27 P003 N015 1
RVR22 N020 P003 1
RVR2 0 N020 50k
R24 N017 8V 1Meg
R39 0 N017 100k
C21 N017 N020 1
Q2 N018 N017 P004 0 2N5089
C25 N018 N017 100p
D4 N009 N008 1N4148
D5 N008 N009 1N4148
R27 N018 8V 82k
R25 0 P004 2.2k
C24 P004 P005 22
R38 0 P005 220
C29 N018 N009 22
R30 N017 N008 1Meg
JQ3 flavor N019 P006 J112
C26 N019 N018 100n
R36 0 N019 1Meg
R37 0 P006 20k
R29 flavor 8V 20k
C20 N013 in3 1
R17 0 N013 68k
XUd3 N013 N004 8V -8V N004 level2 Avol=1Meg GBW=10Meg Slew=10Meg Ilimit=25m Rail=0 Vos=0 En=0 Enk=0 In=0 Ink=0 Rin=500Meg ;pnba In+)In-)V+)V-)OUT
R18 N002 N004 12k
XUc3 0 N002 8V -8V low_boost level2 Avol=1Meg GBW=10Meg Slew=10Meg Ilimit=25m Rail=0 Vos=0 En=0 Enk=0 In=0 Ink=0 Rin=500Meg ;pnba In+)In-)V+)V-)OUT
C13 low_boost N002 220p
R20 low_boost N002 68k
R15 P007 N002 4.99k
C14 low_boost P007 47n
R13 N024 in4 10k
RVR4 N021 N024 {50k-b}
RVR44 N025 N021 {b}
R14 N006 N025 10k
R16 N021 N005 20k
XUb11 0 N005 8V -8V N006 level2 Avol=1Meg GBW=10Meg Slew=10Meg Ilimit=25m Rail=0 Vos=0 En=0 Enk=0 In=0 Ink=0 Rin=500Meg ;pnba In+)In-)V+)V-)OUT
C11 N025 N024 22n
C6 N006 N005 220p
C19 N005 N003 1.5n
R28 N006 P008 4.99k
R21 P009 in4 4.99k
RVR3 N003 P009 {50k-t}
RVR33 P008 N003 {t}
R11 P010 N006 2.2k
C2 eq P010 22
RVR1 0 eq 5k
.ac oct 20 20 20k
;tran 0 4m 0
.step param t list 1 25k 49.99k
.step param b list 1 25k 49.99k

* LTspice schematic (.asc)
Version 4
SHEET 1 3824 672
WIRE -1752 -240 -1752 -320
WIRE -264 -224 -280 -224
WIRE 1032 -224 1032 -304
WIRE 1080 -224 1032 -224
WIRE 1176 -224 1176 -304
WIRE 1176 -224 1160 -224
WIRE 1592 -224 1592 -272
WIRE -1752 -160 -1752 -240
WIRE 920 -160 824 -160
WIRE 1624 -160 1592 -160
WIRE 1752 -160 1752 -272
WIRE 1752 -160 1688 -160
WIRE -360 -144 -360 -224
WIRE -344 -144 -360 -144
WIRE -264 -144 -264 -224
WIRE -264 -144 -280 -144
WIRE 1032 -144 1032 -224
WIRE 1080 -144 1032 -144
WIRE 1176 -144 1176 -224
WIRE 1176 -144 1144 -144
WIRE -1752 -80 -1752 -160
WIRE -360 -80 -360 -144
WIRE -344 -80 -360 -80
WIRE -264 -80 -264 -144
WIRE -264 -80 -280 -80
WIRE 232 -80 232 -144
WIRE 296 -80 296 -144
WIRE 824 -80 824 -160
WIRE 840 -80 824 -80
WIRE 1592 -80 1592 -160
WIRE 1656 -80 1592 -80
WIRE -456 -64 -456 -224
WIRE -440 -64 -456 -64
WIRE -360 -64 -360 -80
WIRE 920 -64 920 -160
WIRE 920 -64 904 -64
WIRE 936 -64 920 -64
WIRE 1032 -64 1032 -144
WIRE 1032 -64 1016 -64
WIRE 1048 -64 1032 -64
WIRE 1752 -64 1752 -160
WIRE 1752 -64 1720 -64
WIRE 1912 -64 1896 -64
WIRE -920 -48 -936 -48
WIRE -776 -48 -840 -48
WIRE -696 -48 -776 -48
WIRE 600 -48 552 -48
WIRE 760 -48 744 -48
WIRE 840 -48 824 -48
WIRE 1176 -48 1176 -144
WIRE 1176 -48 1112 -48
WIRE 1192 -48 1176 -48
WIRE 1432 -48 1432 -272
WIRE 1432 -48 1400 -48
WIRE 1656 -48 1640 -48
WIRE 1048 -32 1032 -32
WIRE 1592 -32 1592 -80
WIRE 824 -16 824 -48
WIRE 1896 -16 1896 -64
WIRE -1752 0 -1752 -80
WIRE -360 0 -360 -64
WIRE -344 0 -360 0
WIRE -264 0 -264 -80
WIRE -264 0 -280 0
WIRE -104 0 -120 0
WIRE -40 0 -40 -48
WIRE -744 16 -776 16
WIRE -616 16 -616 -48
WIRE -616 16 -680 16
WIRE 232 16 232 0
WIRE 264 16 232 16
WIRE 360 16 360 -80
WIRE 360 16 328 16
WIRE 440 16 360 16
WIRE 1032 16 1032 -32
WIRE 360 32 360 16
WIRE -952 48 -1080 48
WIRE -40 48 -40 0
WIRE 504 64 504 16
WIRE -1752 80 -1752 0
WIRE -360 80 -360 0
WIRE -344 80 -360 80
WIRE 72 80 24 80
WIRE 136 80 136 48
WIRE 232 80 232 16
WIRE 232 80 136 80
WIRE 296 80 232 80
WIRE 1432 80 1432 -48
WIRE 1592 80 1592 48
WIRE 1752 80 1752 -64
WIRE -776 96 -776 16
WIRE -712 96 -776 96
WIRE -264 96 -264 0
WIRE -264 96 -280 96
WIRE -248 96 -264 96
WIRE -152 96 -152 64
WIRE -152 96 -184 96
WIRE -120 96 -120 0
WIRE -120 96 -152 96
WIRE -104 96 -120 96
WIRE -1080 112 -1080 48
WIRE -1048 112 -1080 112
WIRE -616 112 -616 16
WIRE -616 112 -648 112
WIRE -600 112 -616 112
WIRE -344 112 -360 112
WIRE 136 112 136 80
WIRE -1752 128 -1752 80
WIRE -952 128 -952 48
WIRE -952 128 -984 128
WIRE -936 128 -936 -48
WIRE -936 128 -952 128
WIRE -712 128 -728 128
WIRE -152 128 -152 96
WIRE -1304 144 -1320 144
WIRE -1128 144 -1160 144
WIRE -1080 144 -1128 144
WIRE -1048 144 -1080 144
WIRE -776 144 -776 96
WIRE -360 160 -360 112
WIRE 1512 160 1512 80
WIRE 1560 160 1512 160
WIRE 1672 160 1672 80
WIRE 1672 160 1624 160
WIRE -1304 176 -1304 144
WIRE -1128 176 -1128 144
WIRE -1080 176 -1080 144
WIRE -936 256 -936 128
WIRE -776 256 -776 224
WIRE -616 256 -616 112
WIRE -856 336 -856 256
WIRE -808 336 -856 336
WIRE -696 336 -696 256
WIRE -696 336 -744 336
FLAG -1752 208 0
FLAG -1752 -320 in
FLAG -1832 208 0
FLAG -1832 128 8V
FLAG -1688 -320 in1
FLAG -1688 -240 in2
FLAG -1688 -160 in3
FLAG -1688 -80 in4
FLAG -1688 0 in5
FLAG -1688 80 in6
FLAG -1016 96 8V
FLAG -1304 256 0
FLAG -1320 144 in1
FLAG -1912 128 0
FLAG -1912 208 -8V
FLAG -1128 256 0
FLAG -1080 240 0
FLAG -1016 160 -8V
FLAG -680 80 8V
FLAG -680 144 -8V
FLAG -728 128 0
FLAG -360 240 0
FLAG -312 64 8V
FLAG -312 128 -8V
FLAG -424 112 in2
FLAG -456 0 0
FLAG -152 208 0
FLAG -152 -16 8V
FLAG -40 -128 8V
FLAG -40 224 0
FLAG 24 160 0
FLAG 136 192 0
FLAG 136 -32 8V
FLAG 360 -160 8V
FLAG 360 208 0
FLAG 424 208 0
FLAG 504 144 0
FLAG 552 128 0
FLAG 552 -128 8V
FLAG 824 64 0
FLAG 872 -96 8V
FLAG 872 -32 -8V
FLAG 1080 -80 8V
FLAG 1080 -16 -8V
FLAG 1032 16 0
FLAG 1688 -96 8V
FLAG 1688 -32 -8V
FLAG 1640 -48 0
FLAG 1896 64 0
FLAG 1400 -48 in4
FLAG 744 -48 in3
FLAG -600 112 pre_eq
FLAG 600 -48 flavor
FLAG 1192 -48 low_boost
FLAG 1912 -64 eq
SYMBOL voltage -1752 112 R0
SYMATTR Value2 AC 1V
SYMATTR InstName V1
SYMATTR Value SINE(0 0.1V 0.5kHz)
SYMBOL voltage -1832 112 R0
SYMATTR InstName V2
SYMATTR Value 8
SYMBOL Opamps\\UniversalOpamp2 -1016 128 R0
SYMATTR InstName Ua11
SYMBOL cap -1688 -256 R90
SYMATTR InstName C998
SYMATTR Value 100u
SYMBOL cap -1688 -176 R90
SYMATTR InstName C997
SYMATTR Value 100u
SYMBOL cap -1688 -96 R90
SYMATTR InstName C996
SYMATTR Value 100u
SYMBOL cap -1688 -336 R90
SYMATTR InstName C999
SYMATTR Value 100u
SYMBOL cap -1688 -16 R90
SYMATTR InstName C995
SYMATTR Value 100u
SYMBOL cap -1688 64 R90
SYMATTR InstName C994
SYMATTR Value 100u
SYMBOL cap -1240 128 R90
SYMATTR InstName C1
SYMATTR Value 1u
SYMBOL res -1112 272 R180
SYMATTR InstName R3
SYMATTR Value 2Meg
SYMBOL res -1288 272 R180
SYMATTR InstName R1
SYMATTR Value 330k
SYMBOL res -1144 128 R90
SYMATTR InstName R2
SYMATTR Value 4.99k
SYMBOL voltage -1912 112 R0
SYMATTR InstName V3
SYMATTR Value 8
SYMBOL cap -1064 240 R180
SYMATTR InstName C3
SYMATTR Value 220p
SYMBOL res -840 240 R90
SYMATTR InstName R6
SYMATTR Value 4.99k
SYMBOL res -760 240 R90
SYMATTR InstName R5
SYMATTR Value 51k
SYMBOL res -680 240 R90
SYMATTR InstName R9
SYMATTR Value 1k
SYMBOL res -600 240 R90
SYMATTR InstName R8
SYMATTR Value 4.99k
SYMBOL res -760 240 R180
SYMATTR InstName R4
SYMATTR Value 20k
SYMBOL Opamps\\UniversalOpamp2 -680 112 R0
SYMATTR InstName Ub3
SYMBOL cap -744 320 R90
SYMATTR InstName C8
SYMATTR Value 22n
SYMBOL cap -680 0 R90
SYMATTR InstName C10
SYMATTR Value 100p
SYMBOL cap -760 16 R180
SYMATTR InstName C9
SYMATTR Value 3.3n
SYMBOL res -824 -64 R90
SYMATTR InstName R7
SYMATTR Value 51k
SYMBOL res -600 -64 R90
SYMATTR InstName R10
SYMATTR Value 4.99k
SYMBOL cap -360 96 R90
SYMATTR InstName C12
SYMATTR Value 100n
SYMBOL res -344 256 R180
SYMATTR InstName R19
SYMATTR Value 15k
SYMBOL Opamps\\UniversalOpamp2 -312 96 R0
SYMATTR InstName Ua3
SYMBOL cap -280 -16 R90
SYMATTR InstName C18
SYMATTR Value 470p
SYMBOL diode -344 -160 M90
SYMATTR InstName D6
SYMATTR Value 1N4148
SYMBOL LED -280 -96 R90
SYMATTR InstName D3
SYMATTR Value QTLP690C
SYMBOL res -264 -240 R90
SYMATTR InstName R22
SYMATTR Value 20k
SYMBOL res -344 -240 R90
SYMATTR InstName R33
SYMATTR Value 3k
SYMBOL res -344 -160 R90
SYMATTR InstName R35
SYMATTR Value 634
SYMBOL res -344 -80 R90
SYMATTR InstName R34
SYMATTR Value 20k
SYMBOL cap -440 -64 M0
SYMATTR InstName C32
SYMATTR Value 2.2u
SYMBOL cap -184 80 R90
SYMATTR InstName C22
SYMATTR Value 1u
SYMBOL res -136 80 R180
SYMATTR InstName R23
SYMATTR Value 1Meg
SYMBOL res -136 224 R180
SYMATTR InstName R26
SYMATTR Value 1Meg
SYMBOL npn -104 48 R0
SYMATTR InstName Q1
SYMATTR Value 2N5089
SYMBOL cap -40 -16 R90
SYMATTR InstName C23
SYMATTR Value 220p
SYMBOL res -24 240 R180
SYMATTR InstName R31
SYMATTR Value 2k
SYMBOL res -24 -32 R180
SYMATTR InstName R32
SYMATTR Value 3k
SYMBOL cap 24 -16 R90
SYMATTR InstName C27
SYMATTR Value 1u
SYMBOL res 8 96 M180
SYMATTR InstName VR22
SYMATTR Value 1
SYMBOL res 8 176 M180
SYMATTR InstName VR2
SYMATTR Value 50k
SYMBOL res 120 64 M180
SYMATTR InstName R24
SYMATTR Value 1Meg
SYMBOL res 120 208 M180
SYMATTR InstName R39
SYMATTR Value 100k
SYMBOL cap 136 64 R90
SYMATTR InstName C21
SYMATTR Value 1u
SYMBOL npn 296 32 R0
SYMATTR InstName Q2
SYMATTR Value 2N5089
SYMBOL cap 328 0 R90
SYMATTR InstName C25
SYMATTR Value 100p
SYMBOL diode 296 -160 R90
SYMATTR InstName D4
SYMATTR Value 1N4148
SYMBOL diode 232 -96 M90
SYMATTR InstName D5
SYMATTR Value 1N4148
SYMBOL res 344 -64 M180
SYMATTR InstName R27
SYMATTR Value 82k
SYMBOL res 376 224 R180
SYMATTR InstName R25
SYMATTR Value 2.2k
SYMBOL cap 360 144 R270
SYMATTR InstName C24
SYMATTR Value 22u
SYMBOL res 408 224 M180
SYMATTR InstName R38
SYMATTR Value 220
SYMBOL cap 360 -96 R90
SYMATTR InstName C29
SYMATTR Value 22u
SYMBOL res 248 16 R180
SYMATTR InstName R30
SYMATTR Value 1Meg
SYMBOL njf 504 -48 R0
SYMATTR InstName Q3
SYMATTR Value J112
SYMBOL cap 504 0 R90
SYMATTR InstName C26
SYMATTR Value 100n
SYMBOL res 520 160 R180
SYMATTR InstName R36
SYMATTR Value 1Meg
SYMBOL res 536 144 M180
SYMATTR InstName R37
SYMATTR Value 20k
SYMBOL res 536 -32 M180
SYMATTR InstName R29
SYMATTR Value 20k
SYMBOL cap 824 -64 R90
SYMATTR InstName C20
SYMATTR Value 1u
SYMBOL res 840 80 R180
SYMATTR InstName R17
SYMATTR Value 68k
SYMBOL Opamps\\UniversalOpamp2 872 -64 R0
SYMATTR InstName Ud3
SYMBOL res 1032 -80 R90
SYMATTR InstName R18
SYMATTR Value 12k
SYMBOL Opamps\\UniversalOpamp2 1080 -48 R0
SYMATTR InstName Uc3
SYMBOL cap 1144 -160 R90
SYMATTR InstName C13
SYMATTR Value 220p
SYMBOL res 1176 -240 R90
SYMATTR InstName R20
SYMATTR Value 68k
SYMBOL res 1128 -320 R90
SYMATTR InstName R15
SYMATTR Value 4.99k
SYMBOL cap 1176 -320 R90
SYMATTR InstName C14
SYMATTR Value 47n
SYMBOL res 1528 64 R90
SYMATTR InstName R13
SYMATTR Value 10k
SYMBOL res 1608 64 R90
SYMATTR InstName VR4
SYMATTR Value {50k-b}
SYMBOL res 1688 64 R90
SYMATTR InstName VR44
SYMATTR Value {b}
SYMBOL res 1768 64 R90
SYMATTR InstName R14
SYMATTR Value 10k
SYMBOL res 1608 64 R180
SYMATTR InstName R16
SYMATTR Value 20k
SYMBOL Opamps\\UniversalOpamp2 1688 -64 R0
SYMATTR InstName Ub11
SYMBOL cap 1624 144 R90
SYMATTR InstName C11
SYMATTR Value 22n
SYMBOL cap 1688 -176 R90
SYMATTR InstName C6
SYMATTR Value 220p
SYMBOL cap 1608 -160 R180
SYMATTR InstName C19
SYMATTR Value 1.5n
SYMBOL res 1768 -288 R90
SYMATTR InstName R28
SYMATTR Value 4.99k
SYMBOL res 1528 -288 R90
SYMATTR InstName R21
SYMATTR Value 4.99k
SYMBOL res 1608 -288 R90
SYMATTR InstName VR3
SYMATTR Value {50k-t}
SYMBOL res 1688 -288 R90
SYMATTR InstName VR33
SYMATTR Value {t}
SYMBOL res 1848 -80 R90
SYMATTR InstName R11
SYMATTR Value 2.2k
SYMBOL cap 1896 -80 R90
SYMATTR InstName C2
SYMATTR Value 22u
SYMBOL res 1912 80 R180
SYMATTR InstName VR1
SYMATTR Value 5k