Version 4
SHEET 1 880 680
WIRE 96 96 -32 96
WIRE 144 96 96 96
WIRE 256 96 224 96
WIRE 432 96 256 96
WIRE -32 128 -32 96
WIRE 432 144 432 96
WIRE 96 176 96 96
WIRE 160 176 96 176
WIRE 256 176 256 96
WIRE 256 176 224 176
FLAG -32 208 0
FLAG 432 208 0
SYMBOL voltage -32 112 R0
WINDOW 3 -20 146 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 -130 65 Left 0
SYMATTR InstName V1
SYMATTR Value PULSE(0 12 20n 2n 2n 50n)
SYMATTR SpiceLine Rser=5
SYMBOL res 240 80 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R1
SYMATTR Value 20
SYMBOL diode 224 160 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL cap 416 144 R0
SYMATTR InstName C1
SYMATTR Value 800p
TEXT -338 86 Left 0 !.tran 0 100n 0 1n