* SPICE netlist
Q1 Vpos N018 N029 0 2N3904
Q2 Vpos N003 N006 0 NPN
Q3 N010 GndPin N009 0 2N3904
Q4 Vpos N006 N013 0 NPN
Q5 N025 N039 N041 0 NPN
Q6 N034 N038 N040 0 NPN
Q7 N025 N036 N039 0 NPN
Q9 N032 N037 N042 0 BF720/SIE
Q10 N033 N037 N043 0 BF720/SIE
Q11 Vpos N032 N037 0 BF720/SIE
Q12 Vpos N033 N038 0 NPN
Q13 N015 N010 N007 0 2N3906
Q14 N017 N011 N007 0 2N3906
Q15 N032 N029 N027 0 BF721/SIE
Q16 N032 N024 N022 0 2N3906
Q18 N033 N023 N021 0 2N3906
R1 N015 N027 1k1
D1 N004 N010 D
D2 N001 N004 D
R2 Vpos N001 1k
R3 N009 N008 1k
D3 N008 P001 D
D4 P001 MUTE D
R4 N017 N021 4k7
R5 N017 N022 4k7
R6 N023 GndPin 10k
D5 N005 N011 D
D6 N002 N005 D
R7 Vpos N002 1k
Q19 N033 N031 N030 0 BF721/SIE
R8 N015 N030 1k1
R9 N042 Vneg 2k2
R10 N043 Vneg 2k2
R11 N040 Vneg 800
D7 N036 N040 D
R12 N041 Vneg 0.45
R13 N039 Vneg 150
R14 N006 N025 150
R15 N013 N025 0.45
D8 N003 N012 D
D9 N012 N014 D
D10 N014 N034 D
Q20 N036 N034 N025 0 PNP
R16 N025 N024 10k
C1 N025 N033 10pF
D11 N024 GndPin D
D12 GndPin N024 D
I1 N029 Vneg 0.5mA
I2 N031 Vneg 0.5mA
I3 N037 Vneg 10mA
I4 N038 Vneg 5mA
I5 N011 Vneg 1mA
Q17 Vpos IN+ N031 0 2N3904
R17 N020 0 4
R18 MUTE V- 10k
C2 MUTE 0 10F
V1 N035 0 SINE(6.727mV 1 20kHz) AC 1
V2 Vpos 0 35
V3 0 Vneg 35
I6 Vpos N003 10mA
I7 Vpos N007 1mA
R21 IN+ 0 100
R22 IN+ N019 3k3
V4 +12V 0 12
V5 0 -12V 12
C13 N016 N019 820pF
R23 N018 IN 2k
C7 N018 0 68pF
R24 N018 OUT 41k
C3 N018 OUT 12pF
XU1 0 N018 +12V -12V N019 LT1363 ;pnba In+)In-)V+)V-)OUT
R25 IN+ N016 1k6
C4 N020 N028 1F
R19 OUT N025 0.0001
C5 IN 0 100
R20 IN 0 1Meg
R26 N028 0 0.1
L1 N020 OUT 2H
R27 N020 OUT 22
C6 IN+ N026 33pF
R28 N019 N026 25
V6 IN 0 PWL(0 0 10uS 0 10.1uS 1 20uS 1 20.1uS -1 30uS -1 30.1uS 1)
.tran 0.1 startup
;ac oct 10 10 50000000
.four 20kHz V(OUT)

* LTspice schematic (.asc)
Version 4
SHEET 1 3152 1600
WIRE -504 -800 -792 -800
WIRE -344 -800 -504 -800
WIRE -136 -800 -344 -800
WIRE 296 -800 -136 -800
WIRE 552 -800 296 -800
WIRE 696 -800 552 -800
WIRE 888 -800 696 -800
WIRE -136 -736 -136 -800
WIRE 296 -736 296 -800
WIRE -504 -720 -504 -800
WIRE -344 -672 -344 -800
WIRE 552 -624 552 -800
WIRE -504 -608 -504 -640
WIRE -136 -608 -136 -656
WIRE -1032 -592 -1144 -592
WIRE -1000 -592 -1032 -592
WIRE -968 -592 -1000 -592
WIRE 296 -576 296 -656
WIRE 488 -576 296 -576
WIRE -1144 -544 -1144 -592
WIRE -1032 -544 -1032 -592
WIRE -504 -512 -504 -544
WIRE -136 -512 -136 -544
WIRE 696 -512 696 -800
WIRE 296 -496 296 -576
WIRE 552 -464 552 -528
WIRE 632 -464 552 -464
WIRE -344 -448 -344 -592
WIRE -344 -448 -392 -448
WIRE -280 -448 -344 -448
WIRE -1144 -416 -1144 -464
WIRE -1032 -416 -1032 -480
WIRE -840 -400 -840 -592
WIRE -776 -400 -840 -400
WIRE -664 -400 -696 -400
WIRE -504 -400 -504 -448
WIRE -504 -400 -568 -400
WIRE -456 -400 -504 -400
WIRE -136 -400 -136 -448
WIRE -136 -400 -216 -400
WIRE 296 -400 296 -432
WIRE -136 -384 -136 -400
WIRE 552 -352 552 -464
WIRE 696 -352 696 -416
WIRE -616 -288 -616 -336
WIRE 296 -272 296 -336
WIRE -392 -256 -392 -352
WIRE -392 -256 -552 -256
WIRE -88 -256 -392 -256
WIRE -1144 -224 -1176 -224
WIRE -1016 -224 -1064 -224
WIRE -280 -192 -280 -352
WIRE -280 -192 -328 -192
WIRE -232 -192 -280 -192
WIRE -88 -192 -88 -256
WIRE -552 -176 -552 -256
WIRE -792 -160 -792 -800
WIRE -696 -160 -792 -160
WIRE -328 -160 -328 -192
WIRE -232 -160 -232 -192
WIRE -696 -128 -696 -160
WIRE -1336 -96 -1432 -96
WIRE -1240 -80 -1240 -224
WIRE -1240 -80 -1272 -80
WIRE -1208 -80 -1240 -80
WIRE -1096 -80 -1128 -80
WIRE -1048 -80 -1096 -80
WIRE -1016 -80 -1016 -224
WIRE -1016 -80 -1048 -80
WIRE -952 -80 -1016 -80
WIRE -760 -80 -952 -80
WIRE 1112 -80 1080 -80
WIRE 1256 -80 1192 -80
WIRE -1336 -64 -1384 -64
WIRE -1240 -64 -1240 -80
WIRE -328 -48 -328 -80
WIRE -232 -48 -232 -80
WIRE -1048 -16 -1048 -80
WIRE -792 -16 -792 -160
WIRE -392 0 -440 0
WIRE -40 0 -168 0
WIRE 24 0 -40 0
WIRE 72 0 24 0
WIRE 200 0 152 0
WIRE 440 0 200 0
WIRE 552 0 552 -272
WIRE 552 0 440 0
WIRE 696 0 696 -272
WIRE 696 0 552 0
WIRE 728 0 696 0
WIRE 856 0 808 0
WIRE 1080 0 1080 -80
WIRE 1080 0 856 0
WIRE 1112 0 1080 0
WIRE 1256 0 1256 -80
WIRE 1256 0 1192 0
WIRE 1336 0 1256 0
WIRE -1192 16 -1240 16
WIRE -1096 16 -1096 -80
WIRE -1096 16 -1128 16
WIRE 1256 16 1256 0
WIRE -888 32 -968 32
WIRE -856 32 -888 32
WIRE -440 32 -440 0
WIRE -40 32 -40 0
WIRE 24 32 24 0
WIRE 1336 48 1336 0
WIRE -552 64 -552 -96
WIRE -1384 96 -1384 -64
WIRE -1048 96 -1048 64
WIRE -1048 96 -1384 96
WIRE -968 96 -968 32
WIRE -968 96 -1016 96
WIRE -888 96 -888 32
WIRE -840 96 -888 96
WIRE 1256 96 1256 80
WIRE -1048 112 -1048 96
WIRE -968 112 -968 96
WIRE -792 112 -792 80
WIRE -616 112 -792 112
WIRE -888 128 -888 96
WIRE -40 144 -40 96
WIRE -8 144 -40 144
WIRE 24 144 24 96
WIRE 24 144 -8 144
WIRE -440 160 -440 112
WIRE -8 160 -8 144
WIRE -88 176 -88 -112
WIRE 1336 176 1336 128
WIRE 1336 176 1256 176
WIRE -1432 208 -1432 -96
WIRE -1016 208 -1016 96
WIRE -1016 208 -1432 208
WIRE -696 224 -696 -32
WIRE -152 224 -696 224
WIRE 1336 224 1336 176
WIRE -1000 240 -1112 240
WIRE -968 240 -968 192
WIRE -968 240 -1000 240
WIRE -888 240 -888 192
WIRE -968 256 -968 240
WIRE 440 272 440 0
WIRE -552 288 -552 160
WIRE -232 288 -232 48
WIRE -232 288 -552 288
WIRE -88 304 -88 272
WIRE -40 304 -88 304
WIRE 200 304 200 0
WIRE 200 304 24 304
WIRE 296 320 296 -208
WIRE 376 320 296 320
WIRE -1560 336 -1576 336
WIRE -1512 336 -1560 336
WIRE -1320 336 -1400 336
WIRE -968 336 -968 320
WIRE -968 336 -1000 336
WIRE -1112 352 -1112 320
WIRE -328 352 -328 48
WIRE -88 352 -88 304
WIRE -88 352 -328 352
WIRE 1224 352 1224 288
WIRE 1352 352 1352 288
WIRE 1464 352 1464 288
WIRE 1576 352 1576 288
WIRE -1112 368 -1112 352
WIRE -840 368 -840 96
WIRE -840 368 -920 368
WIRE -1512 384 -1512 336
WIRE -1400 384 -1400 336
WIRE -408 416 -408 368
WIRE 120 416 120 368
WIRE 552 416 552 0
WIRE -920 432 -920 368
WIRE -840 448 -840 368
WIRE -552 464 -552 288
WIRE -472 464 -552 464
WIRE -88 464 -88 352
WIRE 56 464 -88 464
WIRE 440 464 440 368
WIRE 488 464 440 464
WIRE -552 512 -552 464
WIRE -88 512 -88 464
WIRE 296 512 296 320
WIRE 696 512 696 0
WIRE -1512 528 -1512 464
WIRE -1400 528 -1400 464
WIRE -1400 528 -1512 528
WIRE 440 528 440 464
WIRE 1224 528 1224 432
WIRE 1288 528 1224 528
WIRE 1352 528 1352 432
WIRE 1352 528 1288 528
WIRE 1464 528 1464 432
WIRE 1464 528 1352 528
WIRE 1576 528 1576 432
WIRE 1576 528 1464 528
WIRE -408 560 -408 512
WIRE -408 560 -488 560
WIRE -152 560 -408 560
WIRE 120 560 120 512
WIRE 232 560 120 560
WIRE 552 560 552 512
WIRE 632 560 552 560
WIRE 1288 560 1288 528
WIRE -920 576 -920 512
WIRE -856 576 -920 576
WIRE -840 576 -840 512
WIRE -840 576 -856 576
WIRE -1400 608 -1400 528
WIRE 296 624 296 608
WIRE 440 624 440 592
WIRE 440 624 296 624
WIRE 552 640 552 560
WIRE 696 640 696 608
WIRE -552 656 -552 608
WIRE -88 656 -88 608
WIRE 120 656 120 560
WIRE 296 656 296 624
WIRE -856 672 -856 576
WIRE -792 672 -792 112
WIRE -696 672 -696 224
WIRE -408 672 -408 560
WIRE -792 800 -792 752
WIRE -696 800 -696 752
WIRE -696 800 -792 800
WIRE -552 800 -552 736
WIRE -552 800 -696 800
WIRE -408 800 -408 752
WIRE -408 800 -552 800
WIRE -88 800 -88 736
WIRE -88 800 -408 800
WIRE 120 800 120 736
WIRE 120 800 -88 800
WIRE 296 800 296 736
WIRE 296 800 120 800
WIRE 552 800 552 720
WIRE 552 800 296 800
WIRE 696 800 696 720
WIRE 696 800 552 800
WIRE 888 800 696 800
FLAG -408 368 Vpos
FLAG 120 368 Vpos
FLAG -136 -304 Vneg
FLAG -1000 -592 MUTE
IOPIN -352 -448 In
FLAG -952 -80 IN+
IOPIN -304 64 In
FLAG -1000 336 0
FLAG 856 0 OUT
IOPIN 1504 144 Out
FLAG 888 -800 Vpos
IOPIN 1536 -656 BiDir
FLAG 888 800 Vneg
IOPIN 1536 944 BiDir
FLAG 1336 224 0
FLAG -1048 112 0
FLAG -1032 -416 0
FLAG -1144 -416 V-
FLAG -856 672 OUT
FLAG -1400 608 0
FLAG 1224 288 Vpos
FLAG 1352 288 Vneg
FLAG 1288 560 0
FLAG -1304 -48 -12V
FLAG -1304 -112 +12V
FLAG 1576 288 -12V
FLAG 1464 288 +12V
FLAG -888 240 0
FLAG -1560 336 IN
FLAG -1112 352 0
FLAG -1000 240 IN
FLAG -616 -288 GndPin
FLAG -8 160 GndPin
FLAG -440 160 GndPin
SYMBOL npn -856 -16 R0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL npn 488 -624 R0
SYMATTR InstName Q2
SYMBOL npn -568 -336 M270
SYMATTR InstName Q3
SYMATTR Value 2N3904
SYMBOL npn 632 -512 R0
SYMATTR InstName Q4
SYMBOL npn 632 512 R0
SYMATTR InstName Q5
SYMBOL npn 232 512 R0
SYMATTR InstName Q6
SYMBOL npn 488 416 R0
SYMATTR InstName Q7
SYMBOL npn -488 512 M0
SYMATTR InstName Q9
SYMATTR Value BF720/SIE
SYMBOL npn -152 512 R0
SYMATTR InstName Q10
SYMATTR Value BF720/SIE
SYMBOL npn -472 416 R0
SYMATTR InstName Q11
SYMATTR Value BF720/SIE
SYMBOL npn 56 416 R0
SYMATTR InstName Q12
SYMBOL pnp -456 -352 M180
SYMATTR InstName Q13
SYMATTR Value 2N3906
SYMBOL pnp -216 -352 R180
SYMATTR InstName Q14
SYMATTR Value 2N3906
SYMBOL pnp -616 160 M180
SYMATTR InstName Q15
SYMATTR Value BF721/SIE
SYMBOL pnp -168 48 R180
SYMATTR InstName Q16
SYMATTR Value 2N3906
SYMBOL pnp -392 48 M180
SYMATTR InstName Q18
SYMATTR Value 2N3906
SYMBOL res -568 -192 R0
SYMATTR InstName R1
SYMATTR Value 1k1
SYMBOL diode -520 -512 R0
SYMATTR InstName D1
SYMBOL diode -520 -608 R0
SYMATTR InstName D2
SYMBOL res -520 -736 R0
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL res -680 -416 R90
SYMATTR InstName R3
SYMATTR Value 1k
SYMBOL diode -840 -608 R90
SYMATTR InstName D3
SYMBOL diode -904 -608 R90
SYMATTR InstName D4
SYMBOL res -344 -176 R0
SYMATTR InstName R4
SYMATTR Value 4k7
SYMBOL res -248 -176 R0
SYMATTR InstName R5
SYMATTR Value 4k7
SYMBOL res -456 16 R0
SYMATTR InstName R6
SYMATTR Value 10k
SYMBOL diode -152 -512 R0
SYMATTR InstName D5
SYMBOL diode -152 -608 R0
SYMATTR InstName D6
SYMBOL res -152 -752 R0
SYMATTR InstName R7
SYMATTR Value 1k
SYMBOL pnp -152 272 M180
SYMATTR InstName Q19
SYMATTR Value BF721/SIE
SYMBOL res -104 -208 R0
SYMATTR InstName R8
SYMATTR Value 1k1
SYMBOL res -568 640 R0
SYMATTR InstName R9
SYMATTR Value 2k2
SYMBOL res -104 640 R0
SYMATTR InstName R10
SYMATTR Value 2k2
SYMBOL res 280 640 R0
SYMATTR InstName R11
SYMATTR Value 800
SYMBOL diode 424 528 R0
SYMATTR InstName D7
SYMBOL res 680 624 R0
SYMATTR InstName R12
SYMATTR Value 0.45
SYMBOL res 536 624 R0
SYMATTR InstName R13
SYMATTR Value 150
SYMBOL res 536 -368 R0
SYMATTR InstName R14
SYMATTR Value 150
SYMBOL res 680 -368 R0
SYMATTR InstName R15
SYMATTR Value 0.45
SYMBOL diode 280 -496 R0
SYMATTR InstName D8
SYMBOL diode 280 -400 R0
SYMATTR InstName D9
SYMBOL diode 280 -272 R0
SYMATTR InstName D10
SYMBOL pnp 376 368 M180
SYMATTR InstName Q20
SYMBOL res 168 -16 R90
SYMATTR InstName R16
SYMATTR Value 10k
SYMBOL cap 24 288 R90
SYMATTR InstName C1
SYMATTR Value 10pF
SYMBOL diode -56 32 R0
SYMATTR InstName D11
SYMBOL diode 40 96 R180
SYMATTR InstName D12
SYMBOL current -792 672 R0
SYMATTR InstName I1
SYMATTR Value 0.5mA
SYMBOL current -696 672 R0
SYMATTR InstName I2
SYMATTR Value 0.5mA
SYMBOL current -408 672 R0
SYMATTR InstName I3
SYMATTR Value 10mA
SYMBOL current 120 656 R0
SYMATTR InstName I4
SYMATTR Value 5mA
SYMBOL current -136 -384 R0
SYMATTR InstName I5
SYMATTR Value 1mA
SYMBOL npn -760 -128 R0
SYMATTR InstName Q17
SYMATTR Value 2N3904
SYMBOL res 1320 32 R0
SYMATTR InstName R17
SYMATTR Value 4
SYMBOL res -1160 -560 R0
SYMATTR InstName R18
SYMATTR Value 10k
SYMBOL cap -1048 -544 R0
SYMATTR InstName C2
SYMATTR Value 10uF
SYMBOL voltage -1400 368 R0
SYMATTR Value2 AC 1
SYMATTR InstName V1
SYMATTR Value SINE(6.727mV 1 20kHz)
SYMBOL voltage 1224 336 R0
SYMATTR InstName V2
SYMATTR Value 35
SYMBOL voltage 1352 448 R180
SYMATTR InstName V3
SYMATTR Value 35
SYMBOL current 296 -736 R0
SYMATTR InstName I6
SYMATTR Value 10mA
SYMBOL current -344 -672 R0
SYMATTR InstName I7
SYMATTR Value 1mA
SYMBOL res -1064 -32 R0
SYMATTR InstName R21
SYMATTR Value 100
SYMBOL res -1112 -96 R90
SYMATTR InstName R22
SYMATTR Value 3k3
SYMBOL voltage 1464 336 R0
SYMATTR InstName V4
SYMATTR Value 12
SYMBOL voltage 1576 448 R180
SYMATTR InstName V5
SYMATTR Value 12
SYMBOL cap -1176 -240 R90
SYMATTR InstName C13
SYMATTR Value 820pF
SYMBOL res -984 96 R0
SYMATTR InstName R23
SYMATTR Value 2k
SYMBOL cap -904 128 R0
SYMATTR InstName C7
SYMATTR Value 68pF
SYMBOL res -936 416 R0
SYMATTR InstName R24
SYMATTR Value 41k
SYMBOL cap -856 448 R0
SYMATTR InstName C3
SYMATTR Value 12pF
SYMBOL Opamps\\LT1363 -1304 -144 R0
SYMATTR InstName U1
SYMBOL res -1048 -240 R90
SYMATTR InstName R25
SYMATTR Value 1k6
SYMBOL cap 1240 16 R0
SYMATTR InstName C4
SYMATTR Value 1uF
SYMBOL res 824 -16 R90
SYMATTR InstName R19
SYMATTR Value 0.0001
SYMBOL cap -984 256 R0
SYMATTR InstName C5
SYMATTR Value 100
SYMBOL res -1128 224 R0
SYMATTR InstName R20
SYMATTR Value 1meg
SYMBOL res 1240 80 R0
SYMATTR InstName R26
SYMATTR Value 0.1
SYMBOL ind 1208 -16 R90
SYMATTR InstName L1
SYMATTR Value 2uH
SYMBOL res 1208 -96 R90
SYMATTR InstName R27
SYMATTR Value 22
SYMBOL cap -1128 0 R90
SYMATTR InstName C6
SYMATTR Value 33pF
SYMBOL res -1256 -80 R0
SYMATTR InstName R28
SYMATTR Value 25
SYMBOL voltage -1512 368 R0
SYMATTR InstName V6
SYMATTR Value PWL(0 0 10uS 0 10.1uS 1 20uS 1 20.1uS -1 30uS -1 30.1uS 1)