Version 4
SHEET 1 880 680
WIRE 32 320 32 240
WIRE 32 464 32 320
WIRE 80 240 32 240
WIRE 96 320 32 320
WIRE 96 320 96 288
WIRE 96 336 96 320
WIRE 96 432 96 400
WIRE 144 368 144 288
WIRE 144 432 96 432
WIRE 144 432 144 368
WIRE 192 368 144 368
WIRE 224 240 160 240
WIRE 224 256 224 240
WIRE 224 368 192 368
WIRE 224 368 224 336
WIRE 256 240 224 240
WIRE 368 416 368 400
WIRE 400 240 336 240
WIRE 400 272 400 240
WIRE 400 400 368 400
WIRE 400 400 400 352
WIRE 400 464 32 464
WIRE 400 464 400 400
FLAG 368 416 0
FLAG 224 240 Out
FLAG 192 368 Ramp
SYMBOL cap 80 336 R0
WINDOW 3 16 64 Left 0
SYMATTR InstName Ct
SYMATTR Value 100p
SYMBOL res 208 240 R0
WINDOW 0 -34 36 Left 0
WINDOW 3 -51 65 Left 0
SYMATTR InstName Rt
SYMATTR Value 100k
SYMBOL res 352 224 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName RL
SYMATTR Value 1k
SYMBOL voltage 400 256 R0
WINDOW 0 -32 7 Left 0
WINDOW 3 -10 60 Left 0
SYMATTR InstName V+
SYMATTR Value 15
SYMBOL swhiste 64 240 R270
WINDOW 0 -12 40 VRight 0
SYMATTR InstName U1
TEXT 150 450 Left 0 !.tran 0 100u 0 .1u uic
TEXT 168 384 Left 0 !.param Vtr=5 Vho=2