Version 4
SHEET 1 1172 680
WIRE 160 80 -48 80
WIRE 240 80 160 80
WIRE 448 80 336 80
WIRE -48 112 -48 80
WIRE 448 112 448 80
WIRE 288 160 288 144
WIRE 288 160 160 160
WIRE -48 224 -48 192
WIRE 288 224 -48 224
WIRE 448 224 448 176
WIRE 448 224 288 224
FLAG 288 224 0
SYMBOL zener 304 224 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D1
SYMATTR Value DFLZ33
SYMBOL res 144 64 R0
SYMATTR InstName R1
SYMATTR Value 100
SYMBOL npn3 240 144 R270
SYMATTR InstName Q1
SYMATTR Value 2N3055
SYMBOL voltage -48 96 R0
WINDOW 123 0 0 Left 2
WINDOW 39 24 124 Left 2
SYMATTR SpiceLine Rser=1
SYMATTR InstName V2
SYMATTR Value 150
SYMBOL load 432 112 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName I1
SYMATTR Value 8
TEXT 64 248 Left 2 !.tran 100s