Version 4
SHEET 1 1704 680
WIRE 144 80 16 80
WIRE 416 80 224 80
WIRE 16 224 16 80
WIRE 80 224 16 224
WIRE 176 224 80 224
WIRE 256 224 240 224
WIRE 416 224 416 80
WIRE 416 224 336 224
WIRE 480 224 416 224
WIRE 16 256 16 224
WIRE 16 352 16 320
FLAG 16 352 0
FLAG 480 224 out
FLAG 80 224 rc
SYMBOL Digital\\schmtinv 176 160 R0
SYMATTR InstName A2
SYMATTR SpiceLine Vhigh=5 Vlow=0 Vt=2.5 Vh=0.5
SYMATTR SpiceLine2 Trise=10n Tfall=10n Td=10n
SYMBOL res 240 240 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R3
SYMATTR Value 50
SYMBOL cap 0 256 R0
SYMATTR InstName C1
SYMATTR Value 0.1µ
SYMBOL res 128 96 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value 10k
TEXT 0 -56 Left 2 !.tran 0 4m 0 1u
TEXT 0 -160 Left 2 ;Right-mouse-click on the Schmitt-inverter to set the parameters\nVhigh=5 Vlow=0 Vt=2.5 Vh=0.5\nTrise=10n Tfall=10n Td=10n
TEXT 0 -24 Left 2 !.nodeset V(rc)=0
RECTANGLE Normal 368 288 128 160 2