Version 4
SHEET 1 880 680
WIRE -16 -96 -32 -96
WIRE 112 -96 64 -96
WIRE 160 -96 112 -96
WIRE 448 -96 224 -96
WIRE 112 16 112 -96
WIRE 160 16 112 16
WIRE 288 16 240 16
WIRE 400 16 368 16
WIRE 112 64 112 16
WIRE 400 64 400 16
WIRE 400 64 112 64
WIRE 112 176 112 64
WIRE 128 176 112 176
WIRE 320 176 208 176
WIRE 512 192 512 -96
WIRE 112 272 112 176
WIRE 128 272 112 272
WIRE 400 272 400 176
WIRE 400 272 192 272
WIRE 512 272 400 272
SYMBOL res -32 -80 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value 1.2MEG
SYMBOL res 304 192 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R3
SYMATTR Value 0.2
SYMBOL diode 448 -80 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D1
SYMATTR Value DMOD1
SYMBOL current 160 16 R270
WINDOW 0 32 40 VTop 2
WINDOW 3 -32 40 VBottom 2
SYMATTR InstName I1
SYMBOL voltage 512 176 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 1.4
SYMBOL e 224 176 R90
WINDOW 0 -76 9 Left 2
WINDOW 3 -115 85 Left 2
SYMATTR InstName E1
SYMATTR Value EmOD
SYMBOL diode 160 -80 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D2
SYMATTR Value DMOD1
SYMBOL diode 128 288 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D3
SYMATTR Value DMOD2
SYMBOL res 272 32 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName RMOD
SYMATTR Value 2.495k
TEXT -216 -256 Left 2 !.MODEL RMOD RES (TC1=1.4E-5 TC2=-1E-6)
TEXT -152 -96 Left 2 ;Reference
TEXT 72 -120 Left 2 ;Anode
TEXT 288 -120 Left 2 ;Cathode
TEXT -216 -216 Left 2 !.MODEL DMOD1 D (RS=.3)
TEXT -208 -184 Left 2 !.MODEL DMOD2 D (RS=1E-6)
TEXT -216 520 Left 2 !.op
TEXT -216 -296 Left 2 !.MODEL EMOD ( POLY(2)  (4,2)  (1,2)  0  710  -710)