Version 4
SHEET 1 880 680
WIRE -864 -256 -928 -256
WIRE -640 -256 -816 -256
WIRE -496 -256 -560 -256
WIRE -384 -256 -496 -256
WIRE -1232 -240 -1424 -240
WIRE -1040 -240 -1088 -240
WIRE -992 -240 -1040 -240
WIRE -816 -224 -816 -256
WIRE -496 -224 -496 -256
WIRE -384 -224 -384 -256
WIRE -1424 -208 -1424 -240
WIRE -864 -208 -864 -256
WIRE -1424 -112 -1424 -128
WIRE -864 -112 -864 -160
WIRE -816 -112 -816 -144
WIRE -496 -112 -496 -160
WIRE -384 -112 -384 -144
FLAG -496 -112 0
FLAG -1424 -112 0
FLAG -1040 -240 sin
FLAG -864 -112 0
FLAG -816 -112 0
FLAG -384 -112 0
SYMBOL cap -512 -224 R0
SYMATTR InstName C1
SYMATTR Value 2.214n
SYMBOL res -400 -240 R0
SYMATTR InstName R1
SYMATTR Value 100Meg
SYMBOL res -544 -272 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value {R_v}
SYMBOL SpecialFunctions\\modulate2 -1232 -240 R0
WINDOW 39 -26 122 Left 2
SYMATTR SpiceLine space=0 mark=1meg
SYMATTR InstName A1
SYMBOL Digital\\schmitt -992 -304 R0
WINDOW 39 0 114 Left 2
WINDOW 40 -1 146 Left 2
SYMATTR SpiceLine Vt=0
SYMATTR SpiceLine2 tripdt=1n
SYMATTR InstName A2
SYMBOL bv -1424 -224 R0
WINDOW 3 -13 157 Left 2
SYMATTR Value V=2m*10**(time*3/100m)
SYMATTR InstName B1
SYMBOL e -816 -240 R0
SYMATTR InstName V1
SYMATTR Value 1000
TEXT -1088 -24 Left 2 !.step param R_v 10k 60k 50k
TEXT -496 -320 Left 2 ;LAST
TEXT -1088 8 Left 2 !.tran 100m
RECTANGLE Normal -256 -64 -656 -304 2