Version 4
SHEET 1 1096 680
WIRE 320 -48 320 -80
WIRE 992 16 832 16
WIRE 320 64 320 32
WIRE 832 64 832 16
WIRE 512 80 480 80
WIRE 544 80 512 80
WIRE 784 80 592 80
WIRE 0 96 -48 96
WIRE 320 96 320 64
WIRE 416 96 320 96
WIRE 512 112 480 112
WIRE 592 112 592 80
WIRE 592 112 512 112
WIRE 0 128 0 96
WIRE 320 128 320 96
WIRE 784 192 784 128
WIRE 832 192 832 144
WIRE 0 224 0 208
WIRE 320 224 320 192
FLAG 0 224 0
FLAG -48 96 vc
IOPIN -48 96 In
FLAG 320 224 0
FLAG 320 -80 0
FLAG 512 112 _sr
FLAG 320 64 sc
FLAG 784 192 0
FLAG 832 192 0
FLAG 992 16 out
IOPIN 992 16 Out
FLAG 512 80 sr
SYMBOL bv 0 112 R0
WINDOW 3 -78 153 Left 2
SYMATTR Value V=time*100
SYMATTR InstName B1
SYMBOL Digital\\schmitt 416 32 R0
WINDOW 39 -8 124 Left 2
WINDOW 40 -8 152 Left 2
SYMATTR InstName A1
SYMATTR SpiceLine Vt=0.5 vh=0.5
SYMATTR SpiceLine2 tripdt=5n
SYMBOL bi 320 -48 R0
WINDOW 3 43 42 Left 2
SYMATTR InstName B2
SYMATTR Value I=IF(V(_sr)>0.5, 4m/(1+1.9*V(vc)), -4m)
SYMBOL cap 304 128 R0
SYMATTR InstName C1
SYMATTR Value 10n
SYMBOL e 832 48 R0
SYMATTR InstName E1
SYMATTR Value 10
TEXT -120 -120 Left 2 !.tran 100m
TEXT 368 224 Left 2 !.ic V(sc)=0
TEXT 416 -80 Left 3 ;Toff = 2.5uS  Ton = 2.5u+5us*V(vc)
TEXT -120 48 Left 2 ;Sweep from 0 to 10V
TEXT -96 -200 Left 4 ;Controlled On-Time Generator
RECTANGLE Normal 944 272 160 -128