Version 4
SHEET 1 880 680
WIRE 0 -464 -32 -464
WIRE 128 -464 80 -464
WIRE 160 -464 128 -464
WIRE 272 -464 240 -464
WIRE 128 -416 128 -464
WIRE 128 -416 -96 -416
WIRE -656 -400 -656 -416
WIRE -32 -400 -32 -464
WIRE 96 -400 -32 -400
WIRE 32 -320 32 -336
WIRE -96 -304 -96 -416
WIRE 0 -304 -96 -304
WIRE -656 -288 -656 -320
WIRE -656 -288 -704 -288
WIRE 96 -288 96 -400
WIRE 96 -288 64 -288
WIRE 288 -288 96 -288
WIRE 0 -272 -272 -272
WIRE -656 -256 -656 -288
WIRE -272 -224 -272 -272
WIRE -656 -144 -656 -176
WIRE -272 -128 -272 -144
WIRE -448 48 -688 48
WIRE 0 48 -448 48
WIRE 80 48 0 48
WIRE 80 128 80 48
WIRE -320 160 -480 160
WIRE 0 160 0 48
WIRE 0 160 -96 160
WIRE -320 224 -352 224
WIRE -32 224 -96 224
WIRE 80 224 80 208
WIRE 80 224 -32 224
WIRE 192 224 80 224
WIRE -688 240 -688 48
WIRE 80 240 80 224
WIRE 192 240 192 224
WIRE -320 288 -592 288
WIRE -32 288 -96 288
WIRE -16 288 -32 288
WIRE -592 304 -592 288
WIRE -16 336 -16 288
WIRE 80 336 80 320
WIRE 80 336 -16 336
WIRE 192 336 192 304
WIRE 192 336 80 336
WIRE -448 352 -448 48
WIRE -320 352 -448 352
WIRE -16 352 -96 352
WIRE 80 352 80 336
WIRE -688 480 -688 320
WIRE -592 480 -592 384
WIRE -592 480 -688 480
WIRE -480 480 -480 160
WIRE -480 480 -592 480
WIRE -16 480 -16 416
WIRE -16 480 -480 480
WIRE 80 480 80 416
WIRE 80 480 -16 480
WIRE -688 512 -688 480
WIRE -448 608 -448 352
WIRE 288 608 288 -288
WIRE 288 608 -448 608
FLAG -32 224 DIS
FLAG -688 512 0
FLAG -352 224 TRIG
IOPIN -352 224 In
FLAG -32 288 TRIG
FLAG -656 -144 -Ub
FLAG -656 -416 +Ub
FLAG 32 -256 -Ub
FLAG 32 -336 +Ub
FLAG -704 -288 0
FLAG -272 -128 0
FLAG 272 -464 0
SYMBOL Misc\\NE555 -208 256 R0
SYMATTR InstName U1
SYMBOL cap -32 352 R0
SYMATTR InstName C1
SYMATTR Value 10n
SYMBOL res 64 112 R0
SYMATTR InstName R1
SYMATTR Value 35.8k
SYMBOL res 64 224 R0
SYMATTR InstName R2
SYMATTR Value 35.8k
SYMBOL cap 64 352 R0
SYMATTR InstName C2
SYMATTR Value 1n
SYMBOL voltage -688 224 R0
WINDOW 123 0 0 Left 2
WINDOW 39 24 132 Left 2
SYMATTR InstName Vcc
SYMATTR Value 9
SYMBOL diode 176 240 R0
SYMATTR InstName D1
SYMBOL res -608 288 R0
SYMATTR InstName R3
SYMATTR Value 100
SYMBOL Comparators\\LT1721 32 -352 R0
SYMATTR InstName U2
SYMBOL voltage -656 -416 R0
WINDOW 3 33 83 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value 9
SYMATTR InstName V1
SYMBOL current -272 -224 R0
WINDOW 3 -162 82 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
WINDOW 0 -54 17 Left 2
SYMATTR Value SINE(0 2 20k)
SYMATTR InstName I1
SYMBOL voltage -656 -272 R0
WINDOW 3 33 83 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value 9
SYMATTR InstName V2
SYMBOL res 256 -480 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 1k
SYMBOL res 96 -480 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 1k
TEXT -304 432 Left 2 !.tran 3m startup