* SPICE netlist
R2 REF N002 70k
R1 IZSET 0 118
R3 REF N005 61.9k
C4 N002 0 10n
R4 REF DIV 13k
R5 DIV 0 1k
R9 N006 N004 100k
C1 DIV N006 0.047
C3 N005 0 0.1
D1 DIODE 0 1N4148
XU3 N005 DIV IN 0 N004 LT1013 ;pnba In+)In-)V+)V-)OUT
Q3 IN N003 HEATER+ 0 2N3904
R11 N004 N003 1k
XU2 N002 IZSET IN 0 N001 LT1013 ;pnba In+)In-)V+)V-)OUT
XU4 HEATER+ DIODE REF IZSET N002 DIV 0 N005 TEMP ADR1000 ;pnba 1)2)3)4)5)6)7)8)9
D2 N001 REF 1N4148
V1 IN 0 30
.tran 500m startup

* LTspice schematic (.asc)
Version 4
SHEET 1 1632 848
WIRE -704 -424 -816 -424
WIRE -192 -424 -704 -424
WIRE 736 -424 -192 -424
WIRE -816 -408 -816 -424
WIRE 0 -360 -112 -360
WIRE 352 -360 0 -360
WIRE 448 -360 352 -360
WIRE 800 -360 448 -360
WIRE 816 -360 800 -360
WIRE 816 -328 816 -360
WIRE -816 -312 -816 -328
WIRE -112 -312 -112 -360
WIRE 0 -312 0 -360
WIRE 352 -312 352 -360
WIRE 736 -264 736 -424
WIRE -704 -248 -704 -424
WIRE 704 -248 672 -248
WIRE -192 -232 -192 -424
WIRE 816 -232 816 -264
WIRE 816 -232 768 -232
WIRE -112 -216 -112 -232
WIRE -112 -216 -160 -216
WIRE -80 -216 -112 -216
WIRE 352 -216 352 -232
WIRE 576 -216 352 -216
WIRE 704 -216 576 -216
WIRE -608 -200 -640 -200
WIRE -480 -200 -528 -200
WIRE -224 -200 -480 -200
WIRE 576 -200 576 -216
WIRE 0 -184 0 -232
WIRE 0 -184 -160 -184
WIRE 208 -184 0 -184
WIRE 736 -184 736 -200
WIRE 0 -168 0 -184
WIRE -192 -152 -192 -168
WIRE 208 -152 208 -184
WIRE 352 -152 352 -216
WIRE 448 -152 448 -360
WIRE 576 -120 576 -136
WIRE 0 -88 0 -104
WIRE -480 -24 -480 -200
WIRE -352 -24 -480 -24
WIRE -224 -24 -272 -24
WIRE -112 -24 -112 -216
WIRE -112 -24 -160 -24
WIRE 80 -24 -112 -24
WIRE -112 -8 -112 -24
WIRE -112 88 -112 72
WIRE -704 168 -704 -152
WIRE -64 168 -704 168
WIRE 80 168 -64 168
WIRE 592 168 528 168
WIRE 672 168 672 -248
WIRE 672 168 592 168
WIRE 672 200 672 168
WIRE 560 280 528 280
WIRE -16 296 -48 296
WIRE 80 296 -16 296
WIRE -16 312 -16 296
WIRE -16 408 -16 376
WIRE 352 408 352 344
WIRE 352 408 -16 408
WIRE 672 408 672 280
WIRE 672 408 352 408
WIRE 352 424 352 408
FLAG 352 424 0
FLAG 736 -184 0
FLAG -816 -312 0
FLAG -112 88 0
FLAG 576 -120 0
FLAG -192 -152 0
FLAG 800 -360 REF
FLAG 560 280 TEMP
FLAG -64 168 HEATER+
FLAG 592 168 IZSET
FLAG 0 -88 0
FLAG -48 296 DIODE
FLAG -80 -216 DIV
FLAG -816 -424 IN
SYMBOL res 336 -328 R0
SYMATTR InstName R2
SYMATTR Value 70k
SYMBOL res 656 184 R0
SYMATTR InstName R1
SYMATTR Value 118
SYMBOL res -16 -328 R0
SYMATTR InstName R3
SYMATTR Value 61.9k
SYMBOL cap 560 -200 R0
SYMATTR InstName C4
SYMATTR Value 10n
SYMBOL res -128 -328 R0
SYMATTR InstName R4
SYMATTR Value 13k
SYMBOL res -128 -24 R0
SYMATTR InstName R5
SYMATTR Value 1k
SYMBOL res -256 -40 R90
SYMATTR InstName R9
SYMATTR Value 100k
SYMBOL cap -160 -8 M270
SYMATTR InstName C1
SYMATTR Value 0.047
SYMBOL cap -16 -168 R0
SYMATTR InstName C3
SYMATTR Value 0.1
SYMBOL diode -32 312 R0
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL Opamps\\LT1013 -192 -264 M0
SYMATTR InstName U3
SYMBOL npn -640 -248 M0
SYMATTR InstName Q3
SYMATTR Value 2N3904
SYMBOL res -512 -216 R90
SYMATTR InstName R11
SYMATTR Value 1k
SYMBOL Opamps\\LT1013 736 -296 R0
SYMATTR InstName U2
SYMBOL ADR1000 304 8 R0
SYMATTR InstName U4
SYMBOL diode 800 -264 M180
SYMATTR InstName D2
SYMATTR Value 1N4148
SYMBOL voltage -816 -424 R0
SYMATTR InstName V1
SYMATTR Value 30