Version 4
SHEET 1 880 680
WIRE 464 16 448 16
WIRE 592 16 544 16
WIRE 448 32 448 16
WIRE 592 32 592 16
WIRE 112 48 80 48
WIRE 192 48 176 48
WIRE 0 64 -16 64
WIRE 560 64 464 64
WIRE 96 80 80 80
WIRE 96 96 96 80
WIRE 112 96 96 96
WIRE 192 96 192 48
WIRE 192 96 176 96
WIRE -16 128 -16 64
WIRE 64 128 -16 128
WIRE 192 128 192 96
WIRE 192 128 176 128
WIRE 224 128 192 128
WIRE 336 128 304 128
WIRE 480 128 448 128
WIRE 592 128 592 96
WIRE -16 160 -16 128
WIRE 336 160 336 128
WIRE 160 208 80 208
WIRE 80 224 80 208
WIRE -16 256 -16 240
WIRE 48 256 -16 256
WIRE 160 256 160 208
WIRE 160 256 112 256
WIRE 336 256 336 240
WIRE 336 256 160 256
WIRE 464 256 464 64
WIRE 464 256 336 256
FLAG 448 32 0
SYMBOL Dig_Add\\CD4xxx\\cd4049b 112 64 R0
WINDOW 0 -73 78 Left 0
SYMATTR InstName U1a
SYMATTR SpiceLine VDD=15  SPEED=.4 TRIPDT=5e-9
SYMBOL res -32 144 R0
SYMATTR InstName R1
SYMATTR Value 15k
SYMBOL Robertugo\\Pote 144 240 R90
WINDOW 0 30 0 VRight 0
WINDOW 3 -48 -4 VRight 0
WINDOW 123 -16 22 VCenter 0
SYMATTR InstName P1
SYMATTR Value Rt=2.2e6
SYMBOL cap 176 80 R90
WINDOW 0 16 61 VBottom 0
WINDOW 3 -12 -2 VTop 0
SYMATTR InstName Ct1
SYMATTR Value 33n
SYMBOL cap 176 32 R90
WINDOW 0 16 62 VBottom 0
WINDOW 3 -12 -8 VTop 0
SYMATTR InstName Ct2
SYMATTR Value 390p
SYMBOL Pot&Sw\\spdt 48 64 R0
SYMATTR InstName U1
SYMBOL Dig_Add\\CD4xxx\\cd4049b 384 64 R0
WINDOW 0 -59 51 Left 0
WINDOW 3 -32 99 Left 0
SYMATTR InstName U1b
SYMATTR SpiceLine VDD=15  SPEED=.4 TRIPDT=5e-9
SYMBOL res 352 256 R180
WINDOW 0 36 76 Left 0
WINDOW 3 36 40 Left 0
SYMATTR InstName R2
SYMATTR Value 22k
SYMBOL res 320 112 R90
WINDOW 0 15 100 VBottom 0
WINDOW 3 -12 19 VTop 0
SYMATTR InstName R3
SYMATTR Value 10k
SYMBOL Dig_Add\\CD4xxx\\cd4049b 528 64 R0
WINDOW 0 -59 78 Left 0
WINDOW 3 -31 99 Left 0
SYMATTR InstName U1c
SYMATTR SpiceLine VDD=15  SPEED=.4 TRIPDT=5e-9
SYMBOL Robertugo\\Pote 576 128 M180
WINDOW 0 -7 89 Right 0
WINDOW 3 -14 48 Right 0
WINDOW 123 -20 25 Center 0
SYMATTR InstName P2
SYMBOL res 560 0 R90
WINDOW 0 15 100 VBottom 0
WINDOW 3 -13 14 VTop 0
SYMATTR InstName R4
SYMATTR Value 1k
TEXT -50 270 Left 0 !.tran 10u