* SPICE netlist
V1 N001 0 15
V2 0 N014 15
XU1 0 N004 N001 N014 N008 LT1001 ;pnba In+)In-)V+)V-)OUT
XU5 0 N009 N001 N014 N010 LT1001 ;pnba In+)In-)V+)V-)OUT
R15 N010 N009 10k
R24 N009 N002 10k
C5 N010 N009 10p
D1 N003 N004 1N914
R2 N008 N004 2k
C1 N008 N004 10p
D2 N005 N004 1N914
D3 N006 N004 1N914
R3 N003 N002 330
R4 N005 N002 330
R5 N006 N002 150
R6 N007 N006 1k
R7 N007 N005 1k
R9 N013 N007 1k
R10 N012 N007 1k
R12 N010 N013 150
R13 N010 N012 330
R14 N010 N011 330
D4 N011 N004 1N914
D5 N012 N004 1N914
D6 N013 N004 1N914
V4 N007 0 -2.4
V5 N002 0 0
.dc V5 -10 10 100m
;tran 0 10m 0 1u

* LTspice schematic (.asc)
Version 4
SHEET 1 1456 736
WIRE 488 -368 -392 -368
WIRE 728 -368 488 -368
WIRE -56 -320 -728 -320
WIRE 24 -320 -56 -320
WIRE 104 -320 24 -320
WIRE -56 -304 -56 -320
WIRE 24 -304 24 -320
WIRE 104 -304 104 -320
WIRE -56 -208 -56 -224
WIRE 184 -208 -56 -208
WIRE 296 -208 248 -208
WIRE 24 -160 24 -224
WIRE 184 -160 24 -160
WIRE 296 -160 296 -208
WIRE 296 -160 248 -160
WIRE 728 -144 728 -368
WIRE 104 -112 104 -224
WIRE 184 -112 104 -112
WIRE 296 -112 296 -160
WIRE 296 -112 248 -112
WIRE 24 -96 24 -160
WIRE 104 -96 104 -112
WIRE 728 -48 728 -64
WIRE 728 -32 728 -48
WIRE 104 -16 104 -32
WIRE 520 -16 392 -16
WIRE 616 -16 584 -16
WIRE 24 0 24 -16
WIRE 24 0 -168 0
WIRE 104 0 104 -16
WIRE 104 0 24 0
WIRE 24 16 24 0
WIRE 104 16 104 0
WIRE -376 32 -504 32
WIRE -280 32 -312 32
WIRE -168 32 -168 0
WIRE 296 80 296 -112
WIRE 392 80 392 -16
WIRE 392 80 296 80
WIRE 536 80 392 80
WIRE 616 80 616 -16
WIRE 184 112 -56 112
WIRE 296 112 296 80
WIRE 296 112 248 112
WIRE -504 128 -504 32
WIRE -360 128 -504 128
WIRE -280 128 -280 32
WIRE -168 128 -168 112
WIRE 488 128 488 -368
WIRE 392 144 392 80
WIRE 456 144 392 144
WIRE 24 160 24 96
WIRE 184 160 24 160
WIRE 296 160 296 112
WIRE 296 160 248 160
WIRE 616 160 616 80
WIRE 616 160 520 160
WIRE 456 176 392 176
WIRE -392 192 -392 -368
WIRE -728 208 -728 -320
WIRE -632 208 -728 208
WIRE -504 208 -504 128
WIRE -504 208 -552 208
WIRE -424 208 -504 208
WIRE 104 208 104 96
WIRE 184 208 104 208
WIRE 296 208 296 160
WIRE 296 208 248 208
WIRE 392 208 392 176
WIRE -280 224 -280 128
WIRE -280 224 -360 224
WIRE -56 224 -56 112
WIRE 24 224 24 160
WIRE 104 224 104 208
WIRE -728 240 -728 208
WIRE -424 240 -456 240
WIRE -456 256 -456 240
WIRE -280 320 -280 224
WIRE -56 320 -56 304
WIRE -56 320 -280 320
WIRE 24 320 24 304
WIRE 24 320 -56 320
WIRE 104 320 104 304
WIRE 104 320 24 320
WIRE -728 336 -728 320
WIRE -392 368 -392 256
WIRE 488 368 488 192
WIRE 488 368 -392 368
WIRE 728 368 728 48
WIRE 728 368 488 368
FLAG 728 -48 0
FLAG -456 256 0
FLAG 392 208 0
FLAG -168 128 0
FLAG -728 336 0
SYMBOL voltage 728 -160 R0
SYMATTR InstName V1
SYMATTR Value 15
SYMBOL voltage 728 -48 R0
SYMATTR InstName V2
SYMATTR Value 15
SYMBOL Opamps\\LT1001A 488 96 R0
SYMATTR InstName U1
SYMBOL Opamps\\LT1001A -392 160 R0
SYMATTR InstName U5
SYMBOL res -264 112 R90
SYMATTR InstName R15
SYMATTR Value 10k
SYMBOL res -536 192 R90
SYMATTR InstName R24
SYMATTR Value 10k
SYMBOL cap -312 16 R90
SYMATTR InstName C5
SYMATTR Value 10p
SYMBOL diode 184 -192 R270
SYMATTR InstName D1
SYMATTR Value 1N914
SYMBOL res 632 64 R90
SYMATTR InstName R2
SYMATTR Value 2k
SYMBOL cap 584 -32 R90
SYMATTR InstName C1
SYMATTR Value 10p
SYMBOL diode 184 -144 R270
SYMATTR InstName D2
SYMATTR Value 1N914
SYMBOL diode 184 -96 R270
SYMATTR InstName D3
SYMATTR Value 1N914
SYMBOL res -40 -208 R180
SYMATTR InstName R3
SYMATTR Value 330
SYMBOL res 40 -208 R180
SYMATTR InstName R4
SYMATTR Value 330
SYMBOL res 120 -208 R180
SYMATTR InstName R5
SYMATTR Value 150
SYMBOL res 120 0 R180
SYMATTR InstName R6
SYMATTR Value 1k
SYMBOL res 40 0 R180
SYMATTR InstName R7
SYMATTR Value 1k
SYMBOL res 120 112 R180
SYMATTR InstName R9
SYMATTR Value 1k
SYMBOL res 40 112 R180
SYMATTR InstName R10
SYMATTR Value 1k
SYMBOL res 120 320 R180
SYMATTR InstName R12
SYMATTR Value 150
SYMBOL res 40 320 R180
SYMATTR InstName R13
SYMATTR Value 330
SYMBOL res -40 320 R180
SYMATTR InstName R14
SYMATTR Value 330
SYMBOL diode 184 128 R270
SYMATTR InstName D4
SYMATTR Value 1N914
SYMBOL diode 184 176 R270
SYMATTR InstName D5
SYMATTR Value 1N914
SYMBOL diode 184 224 R270
SYMATTR InstName D6
SYMATTR Value 1N914
SYMBOL voltage -168 16 R0
SYMATTR InstName V4
SYMATTR Value -2.4
SYMBOL voltage -728 224 R0
SYMATTR InstName V5
SYMATTR Value 0