Version 4
SHEET 1 1188 680
WIRE 544 32 -448 32
WIRE 704 32 624 32
WIRE 704 80 704 32
WIRE 752 80 704 80
WIRE 784 80 752 80
WIRE 704 112 704 80
WIRE -448 160 -448 32
WIRE -208 160 -320 160
WIRE 96 160 -208 160
WIRE 208 160 176 160
WIRE 416 160 208 160
WIRE 560 160 416 160
WIRE 640 160 560 160
WIRE -320 176 -320 160
WIRE 208 176 208 160
WIRE 416 240 416 160
WIRE 560 240 560 160
WIRE -320 272 -320 256
WIRE -448 384 -448 240
WIRE -320 384 -320 352
WIRE 208 384 208 256
WIRE 416 384 416 304
WIRE 560 384 560 304
WIRE 704 384 704 208
FLAG -320 384 0
FLAG -448 384 0
FLAG 208 384 0
FLAG 416 384 0
FLAG 560 384 0
FLAG 704 384 0
FLAG -208 160 Input
FLAG 752 80 Output
SYMBOL voltage -320 256 R0
WINDOW 123 24 132 Left 2
WINDOW 39 0 0 Left 2
WINDOW 3 20 104 Left 2
SYMATTR Value PULSE(14 80 0 0.1u 0.1u 500u 5m 20)
SYMATTR InstName V1
SYMBOL voltage -448 144 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
WINDOW 3 11 106 Left 2
SYMATTR Value 3.3
SYMATTR InstName V2
SYMBOL res 192 144 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 1Meg
SYMBOL res 192 160 R0
SYMATTR InstName R1
SYMATTR Value 100k
SYMBOL cap 400 240 R0
SYMATTR InstName C1
SYMATTR Value 5n
SYMBOL voltage -320 160 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value PULSE(0 -14 4.5m 0.1u 0.1u 0.5m 5m 20)
SYMBOL diode 576 304 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL res 640 16 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL npn 640 112 R0
SYMATTR InstName Q1
SYMATTR Value 2N3904
TEXT 88 16 Left 2 !.tran 20m