Version 4
SHEET 1 880 680
WIRE 192 -96 -176 -96
WIRE 256 -96 192 -96
WIRE 448 -96 256 -96
WIRE 256 -64 256 -96
WIRE -176 -48 -176 -96
WIRE 192 -48 192 -96
WIRE -176 48 -176 16
WIRE -112 48 -176 48
WIRE -48 48 -112 48
WIRE 64 48 32 48
WIRE 192 48 192 16
WIRE 192 48 144 48
WIRE 256 48 256 16
WIRE 256 48 192 48
WIRE 448 64 448 -96
WIRE -176 80 -176 48
WIRE -368 128 -432 128
WIRE -240 128 -288 128
WIRE -432 144 -432 128
WIRE -432 240 -432 224
WIRE -176 240 -176 176
WIRE -176 240 -432 240
WIRE 448 240 448 144
WIRE 448 240 -176 240
WIRE -176 256 -176 240
FLAG -176 256 0
FLAG -112 48 UC
SYMBOL npn -240 80 R0
SYMATTR InstName Q1
SYMATTR Value BC847B
SYMBOL diode -160 16 R180
WINDOW 0 24 64 Left 2
WINDOW 3 43 26 Left 2
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL res -272 112 R90
WINDOW 0 6 56 VBottom 2
WINDOW 3 26 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL ind 48 32 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName L1
SYMATTR Value 60µ
SYMBOL res 160 32 R90
WINDOW 0 6 56 VBottom 2
WINDOW 3 26 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 10
SYMBOL ind 240 -80 R0
WINDOW 39 36 108 Left 2
SYMATTR InstName L2
SYMATTR Value 500m
SYMATTR SpiceLine Rser=500
SYMBOL voltage 448 48 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL voltage -432 128 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value PULSE(0 5 0 5n 5n 10m 20m)
SYMBOL diode 208 16 R180
WINDOW 0 24 64 Left 2
WINDOW 3 43 26 Left 2
SYMATTR InstName D2
SYMATTR Value 1N4148
TEXT -466 280 Left 2 !.tran 50m