Version 4
SHEET 1 880 680
WIRE 784 -224 368 -224
WIRE 368 -176 368 -224
WIRE 368 -64 368 -96
WIRE -64 -32 -224 -32
WIRE -64 16 -64 -32
WIRE 368 32 368 16
WIRE 368 48 368 32
WIRE 496 48 368 48
WIRE 624 48 560 48
WIRE 160 80 96 80
WIRE 240 80 224 80
WIRE 304 80 240 80
WIRE 784 112 784 -224
WIRE 624 128 624 48
WIRE 624 128 560 128
WIRE -224 144 -224 -32
WIRE 240 144 240 80
WIRE 240 144 208 144
WIRE 624 160 624 128
WIRE 560 176 560 128
WIRE -64 192 -64 96
WIRE 96 192 96 80
WIRE 96 192 -64 192
WIRE 144 192 96 192
WIRE -64 208 -64 192
WIRE -224 320 -224 224
WIRE -64 320 -64 288
WIRE -64 320 -224 320
WIRE 208 320 208 240
WIRE 208 320 -64 320
WIRE 368 320 368 128
WIRE 368 320 208 320
WIRE 560 320 560 240
WIRE 560 320 368 320
WIRE 624 320 624 240
WIRE 624 320 560 320
WIRE 784 320 784 192
WIRE 784 320 624 320
WIRE 208 368 208 320
FLAG 208 368 0
SYMBOL pnp 144 240 M180
SYMATTR InstName Q1
SYMBOL npn 304 32 R0
SYMATTR InstName Q2
SYMBOL diode 160 96 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D1
SYMBOL res -80 0 R0
SYMATTR InstName R1
SYMATTR Value 100
SYMBOL res -80 192 R0
SYMATTR InstName R2
SYMATTR Value 10000
SYMBOL ind 352 -80 R0
SYMATTR InstName L1
SYMATTR Value 2m
SYMBOL diode 496 64 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D2
SYMBOL res 608 144 R0
SYMATTR InstName R3
SYMATTR Value 100000
SYMBOL voltage -224 128 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value PULSE(0 3.3 0 0 0 10m 20m)
SYMBOL voltage 784 96 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 3.3
SYMBOL res 352 -192 R0
SYMATTR InstName R4
SYMATTR Value 1
SYMBOL cap 544 176 R0
SYMATTR InstName C1
SYMATTR Value 10n
TEXT -40 360 Left 2 !.tran 40m