Version 4
SHEET 1 880 680
WIRE 128 -80 -80 -80
WIRE 208 -80 128 -80
WIRE 128 -32 128 -80
WIRE 208 -32 208 -80
WIRE -80 0 -80 -80
WIRE 128 80 128 32
WIRE 208 80 208 48
WIRE 208 80 128 80
WIRE 208 112 208 80
WIRE -80 240 -80 80
WIRE 128 240 -80 240
WIRE 208 240 208 192
WIRE 208 240 128 240
WIRE 128 272 128 240
FLAG 128 272 0
SYMBOL res 192 96 R0
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL res 192 -48 R0
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL diode 112 -32 R0
SYMATTR InstName D1
SYMBOL voltage -80 -16 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value PULSE(-5 5 0 0 0 10m 20m 2)
TEXT -48 200 Left 2 !.tran 21m