Version 4
SHEET 1 880 680
WIRE -32 160 -192 160
WIRE -32 176 -112 176
WIRE 384 176 304 176
WIRE 64 192 32 192
WIRE 144 192 128 192
WIRE 160 192 144 192
WIRE 240 192 224 192
WIRE 304 192 304 176
WIRE 304 192 240 192
WIRE 496 192 448 192
WIRE 144 208 144 192
WIRE 240 208 240 192
WIRE 304 208 304 192
WIRE -192 224 -192 160
WIRE -112 224 -112 176
WIRE -16 224 -16 208
WIRE 384 224 384 208
WIRE 144 304 144 272
WIRE 240 304 240 272
WIRE 304 304 304 288
FLAG 144 304 0
FLAG 240 304 0
FLAG 304 304 0
FLAG 384 224 0
FLAG -16 224 0
FLAG -112 304 0
FLAG -192 304 0
SYMBOL Digital\\buf 384 112 R0
WINDOW 3 8 44 Invisible 2
SYMATTR InstName A2
SYMATTR Value Rout=1K Trise=100ns Vhigh=5V Vlow=0V
SYMBOL cap 128 176 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 1n
SYMBOL schottky 160 272 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D1
SYMATTR Value BAT54
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL schottky 160 208 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D2
SYMATTR Value BAT54
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL cap 224 208 R0
SYMATTR InstName C2
SYMATTR Value 1n
SYMBOL res 288 192 R0
SYMATTR InstName R1
SYMATTR Value 20k
SYMBOL Digital\\and 0 112 R0
WINDOW 3 16 52 Invisible 2
SYMATTR InstName A1
SYMATTR Value Rout=1K Trise=100ns Vhigh=5V Vlow=0V
SYMBOL voltage -112 208 R0
WINDOW 3 -101 163 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value PULSE(0 5 0 0 0 0.97ms 1ms)
SYMBOL voltage -192 208 R0
WINDOW 3 -23 131 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value PULSE(0 5 0 0 0 4.35us 8.77us)
TEXT -192 88 Left 2 !.tran 0 2ms 0