* SPICE netlist
R1 N008 IN 1k
R2 OUT N008 20k
V1 IN 0 PULSE(-2 2 0 1n 1n 5m 10m) Rser=0.01
Q1 N013 N009 0 0 MJE350
R3 N013 N016 39k
Q2 N011 N014 N016 0 MJE340
R4 N014 N013 10k
R5 N005 N011 10k
R6 N006 N005 10k
R7 N004 N016 1Meg
Q3 N004 N004 N002 0 MJE350
Q4 N006 N004 N003 0 MJE350
Q5 N016 N005 N012 0 MJE350
Q6 N001 N005 N007 0 MJE340
V2 N001 0 125 Rser=0.01
V3 0 N016 125 Rser=0.01
V4 N010 0 12 Rser=0.01
V5 0 N015 12 Rser=0.01
R8 N001 N002 1
R9 N001 N003 1
R10 N007 OUT 1
R11 OUT N012 1
C1 0 OUT 470n
XU1 0 N008 N010 N015 N009 LF411 LF411 ;pnba In+)In-)V+)V-)OUT
D1 N008 N009 1N4148
D2 N009 N008 1N4148
.tran 0 50m 0
.SUBCKT LF411 1 2 99 50 28
IOS 2 1 25.0P
CI1 1 0 3P
CI2 2 0 3P
R1 1 3 1E12
R2 3 2 1E12
I1 99 4 1.0M
J1 5 2 4 JX
J2 6 7 4 JX
R3 5 50 650
R4 6 50 650
C4 5 6 4.372P
I2 99 50 800UA
EOS 7 1 POLY(1) 16 49 .8E-3 1
R8 99 49 80K
R9 49 50 80K
V2 99 8 2.13
D1 9 8 DX
D2 10 9 DX
V3 10 50 2.13
EH 99 98 99 49 1
G1 98 9 5 6 20E-3
R5 98 9 10MEG
VA3 9 11 0
C3 98 11 857.516P
G3 98 15 9 49 1E-6
R12 98 15 1MEG
C5 98 15 5.305E-15
G4 98 16 3 49 1E-8
L2 98 17 144.7M
R13 17 16 1K
F6 99 50 VA7 1
F5 99 23 VA8 1
D5 21 23 DX
VA7 99 21 0
D6 23 99 DX
E1 99 26 99 15 1
VA8 26 27 0
R16 27 28 50
V5 28 25 0.646V
D4 25 15 DX
V4 24 28 0.646V
D3 15 24 DX

* LTspice schematic (.asc)
Version 4
SHEET 1 1824 896
WIRE 672 -448 -464 -448
WIRE 272 -352 16 -352
WIRE 560 -352 272 -352
WIRE 816 -352 560 -352
WIRE 16 -304 16 -352
WIRE 272 -304 272 -352
WIRE 16 -192 16 -224
WIRE 272 -192 272 -224
WIRE 560 -192 560 -352
WIRE 816 -192 816 -352
WIRE 112 -144 80 -144
WIRE 208 -144 112 -144
WIRE 496 -144 464 -144
WIRE -464 -128 -464 -448
WIRE 16 -64 16 -96
WIRE 112 -64 112 -144
WIRE 112 -64 16 -64
WIRE 16 -16 16 -64
WIRE 272 -16 272 -96
WIRE 560 -16 560 -96
WIRE -464 64 -464 -48
WIRE -384 64 -464 64
WIRE -368 64 -384 64
WIRE -272 64 -304 64
WIRE 560 96 560 64
WIRE 672 96 672 -448
WIRE 672 96 560 96
WIRE 688 96 672 96
WIRE 272 112 272 64
WIRE 464 112 464 -144
WIRE 464 112 272 112
WIRE 816 112 816 -112
WIRE 912 112 816 112
WIRE -384 128 -384 64
WIRE -368 128 -384 128
WIRE -272 128 -272 64
WIRE -272 128 -304 128
WIRE 272 144 272 112
WIRE 560 144 560 96
WIRE 912 144 912 112
WIRE -384 176 -832 176
WIRE -64 176 -176 176
WIRE -832 192 -832 176
WIRE -176 192 -176 176
WIRE -64 192 -64 176
WIRE -384 208 -384 176
WIRE -608 224 -608 144
WIRE -608 224 -672 224
WIRE -592 224 -608 224
WIRE -464 224 -464 64
WIRE -464 224 -512 224
WIRE -416 224 -464 224
WIRE -272 240 -272 128
WIRE -272 240 -352 240
WIRE -240 240 -272 240
WIRE -416 256 -464 256
WIRE 672 256 672 96
WIRE 720 256 672 256
WIRE 816 256 816 112
WIRE 816 256 784 256
WIRE 272 272 272 224
WIRE 560 272 560 224
WIRE -832 304 -832 272
WIRE -832 304 -912 304
WIRE -560 304 -672 304
WIRE -464 304 -464 256
WIRE -464 304 -560 304
WIRE -912 320 -912 304
WIRE -832 320 -832 304
WIRE -176 320 -176 288
WIRE 96 320 -176 320
WIRE 208 320 176 320
WIRE 464 320 464 112
WIRE 496 320 464 320
WIRE -560 336 -560 304
WIRE -176 336 -176 320
WIRE 816 336 816 256
WIRE -832 416 -832 400
WIRE -384 416 -384 272
WIRE -384 416 -832 416
WIRE -176 448 -176 416
WIRE 16 448 16 64
WIRE 16 448 -176 448
WIRE 272 448 272 368
WIRE 272 448 16 448
WIRE 560 448 560 368
WIRE 560 448 272 448
WIRE 816 448 816 416
WIRE 816 448 560 448
FLAG -560 336 0
FLAG -64 192 0
FLAG 912 144 0
FLAG -912 320 0
FLAG -608 144 IN
IOPIN -80 80 Out
FLAG 688 96 OUT
IOPIN 1216 32 Out
SYMBOL res -496 208 R90
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL res -480 -144 R0
SYMATTR InstName R2
SYMATTR Value 20k
SYMBOL voltage -672 208 R0
SYMATTR SpiceLine Rser=0.01
SYMATTR InstName V1
SYMATTR Value PULSE(-2 2 0 1n 1n 5m 10m)
SYMBOL pnp -240 288 M180
SYMATTR InstName Q1
SYMATTR Value MJE350
SYMBOL res -192 320 R0
SYMATTR InstName R3
SYMATTR Value 39k
SYMBOL npn 208 272 R0
SYMATTR InstName Q2
SYMATTR Value MJE340
SYMBOL res 192 304 R90
SYMATTR InstName R4
SYMATTR Value 10k
SYMBOL res 256 128 R0
SYMATTR InstName R5
SYMATTR Value 10k
SYMBOL res 256 -32 R0
SYMATTR InstName R6
SYMATTR Value 10k
SYMBOL res 0 -32 R0
SYMATTR InstName R7
SYMATTR Value 1meg
SYMBOL pnp 80 -96 R180
SYMATTR InstName Q3
SYMATTR Value MJE350
SYMBOL pnp 208 -96 M180
SYMATTR InstName Q4
SYMATTR Value MJE350
SYMBOL pnp 496 368 M180
SYMATTR InstName Q5
SYMATTR Value MJE350
SYMBOL npn 496 -192 R0
SYMATTR InstName Q6
SYMATTR Value MJE340
SYMBOL voltage 816 -208 R0
SYMATTR SpiceLine Rser=0.01
SYMATTR InstName V2
SYMATTR Value 125
SYMBOL voltage 816 320 R0
SYMATTR SpiceLine Rser=0.01
SYMATTR InstName V3
SYMATTR Value 125
SYMBOL voltage -832 176 R0
SYMATTR SpiceLine Rser=0.01
SYMATTR InstName V4
SYMATTR Value 12
SYMBOL voltage -832 304 R0
SYMATTR SpiceLine Rser=0.01
SYMATTR InstName V5
SYMATTR Value 12
SYMBOL res 0 -320 R0
SYMATTR InstName R8
SYMATTR Value 1
SYMBOL res 256 -320 R0
SYMATTR InstName R9
SYMATTR Value 1
SYMBOL res 544 -32 R0
SYMATTR InstName R10
SYMATTR Value 1
SYMBOL res 544 128 R0
SYMATTR InstName R11
SYMATTR Value 1
SYMBOL cap 784 240 R90
SYMATTR InstName C1
SYMATTR Value 470n
SYMBOL Opamps\\opamp2 -384 176 R0
SYMATTR InstName U1
SYMATTR Value LF411
SYMATTR InstName LF411
SYMBOL diode -368 144 R270
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL diode -304 48 R90
SYMATTR InstName D2
SYMATTR Value 1N4148