Version 4
SHEET 1 880 680
WIRE -224 176 -224 128
WIRE -176 128 -224 128
WIRE -176 176 -224 176
WIRE -176 256 -176 240
WIRE -144 96 -144 80
WIRE -128 256 -176 256
WIRE -128 256 -128 240
WIRE -96 128 -112 128
WIRE -96 176 -128 176
WIRE -96 176 -96 128
WIRE -80 256 -128 256
WIRE -80 256 -80 192
WIRE -80 272 -80 256
WIRE -80 352 -80 336
WIRE -48 192 -80 192
WIRE -16 80 -144 80
WIRE -16 128 -16 80
WIRE 48 128 -16 128
WIRE 80 192 64 192
WIRE 80 192 80 160
WIRE 128 128 112 128
WIRE 128 192 80 192
WIRE 128 192 128 128
WIRE 144 192 128 192
FLAG -80 352 0
FLAG 144 192 out
IOPIN 144 192 Out
SYMBOL Dig_Add\\CD4xxx\\cd40106b 0 144 R0
WINDOW 0 -66 65 Left 0
SYMATTR InstName U1
SYMATTR SpiceLine VDD={VDD}  SPEED=1.0  TRIPDT=5e-9
SYMBOL Pote 16 144 R270
WINDOW 0 53 85 VRight 0
WINDOW 123 75 29 VCenter 0
WINDOW 3 49 34 VCenter 0
SYMATTR InstName Freq
SYMATTR Value Rt=5k
SYMBOL cap -96 272 R0
WINDOW 0 -45 8 Left 0
WINDOW 3 -48 54 Left 0
SYMATTR InstName C1
SYMATTR Value 100p
SYMATTR SpiceLine Rpar=1e8
SYMBOL Pote -80 112 R90
WINDOW 0 25 -44 VRight 0
WINDOW 123 49 -29 VCenter 0
WINDOW 3 -5 -2 VCenter 0
SYMATTR InstName Duty
SYMATTR Value2 Set=.8
SYMATTR Value Rt=5k
SYMBOL diode -144 176 R0
WINDOW 0 31 33 Left 0
WINDOW 3 23 63 Invisible 0
SYMATTR InstName D1
SYMATTR Value 1N914
SYMBOL diode -160 240 R180
WINDOW 0 40 32 Left 0
WINDOW 3 24 0 Invisible 0
SYMATTR InstName D2
SYMATTR Value 1N914
TEXT -42 314 Left 0 !.tran 10u
TEXT -40 272 Left 0 !.param VDD=15