Version 4
SHEET 1 4432 680
WIRE 1440 -304 1152 -304
WIRE 1440 -288 1440 -304
WIRE 1152 -256 1152 -304
WIRE 1440 -128 1440 -208
WIRE 1584 -128 1440 -128
WIRE 1792 -128 1680 -128
WIRE 1584 -96 1520 -96
WIRE 1728 -96 1680 -96
WIRE 1520 -32 1520 -96
WIRE 1728 -32 1728 -96
WIRE 1440 48 1440 -128
WIRE 1440 48 1408 48
WIRE 1344 96 1264 96
WIRE 1440 144 1408 144
WIRE 1440 176 1440 144
WIRE 1584 176 1440 176
WIRE 1728 176 1664 176
WIRE 1808 176 1728 176
WIRE 1856 176 1808 176
WIRE 1264 192 1264 96
WIRE 1728 192 1728 176
WIRE 1856 192 1856 176
WIRE 1440 288 1440 256
WIRE 1728 288 1728 272
WIRE 1856 288 1856 272
FLAG 1440 288 0
FLAG 1152 -176 0
FLAG 1520 -32 0
FLAG 1808 176 Out
FLAG 1264 272 0
FLAG 1728 288 0
FLAG 1856 288 0
FLAG 1728 -32 0
SYMBOL res 1248 176 R0
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL res 1424 -304 R0
SYMATTR InstName R2
SYMATTR Value 475k
SYMBOL voltage 1152 -272 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 90
SYMBOL tline 1632 -112 R0
SYMATTR InstName T1
SYMATTR Value Td=2n Z0=50
SYMBOL res 1424 160 R0
SYMATTR InstName R7
SYMATTR Value 60
SYMBOL res 1680 160 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 240
SYMBOL res 1712 176 R0
SYMATTR InstName R5
SYMATTR Value 60
SYMBOL res 1840 176 R0
SYMATTR InstName R8
SYMATTR Value 50
SYMBOL mmbt2369Avalanche 1376 96 R0
SYMATTR InstName X1
TEXT 936 352 Left 2 !.tran 0 50u 0.1n uic
TEXT 936 400 Left 4 !.options reltol=0.001m
TEXT 1312 208 Left 4 ;*