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 1520 -128 1440 -128
WIRE 1584 -128 1520 -128
WIRE 1520 -112 1520 -128
WIRE 1520 -32 1520 -48
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 1552 176 1440 176
WIRE 1696 176 1552 176
WIRE 1712 176 1696 176
WIRE 1264 192 1264 96
WIRE 1552 192 1552 176
WIRE 1552 272 1376 272
WIRE 1264 304 1264 272
WIRE 1376 304 1376 272
FLAG 1376 304 0
FLAG 1152 -176 0
FLAG 1520 -32 0
FLAG 1696 176 Out
FLAG 1264 304 0
SYMBOL res 1248 176 R0
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL res 1424 -304 R0
SYMATTR InstName R2
SYMATTR Value 1Meg
SYMBOL voltage 1152 -272 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 130
SYMBOL res 1536 176 R0
SYMATTR InstName R3
SYMATTR Value 50
SYMBOL cap 1504 -112 R0
SYMATTR InstName C1
SYMATTR Value {c} ic=0
SYMBOL 2N2369A_Avalanche 1376 96 R0
SYMATTR InstName X1
TEXT 936 352 Left 2 !.tran 300u uic
TEXT 936 400 Left 4 !.options reltol=0.01m
TEXT 1312 208 Left 4 ;*
TEXT 1472 8 Left 2 !.step param c list    200p 100p 10p 2.p
TEXT 1576 -32 Left 2 !.param c=100p
TEXT 1568 -200 Left 6 ;Alternate