Version 4
SHEET 1 1296 680
WIRE 144 -32 112 -32
WIRE 256 -32 224 -32
WIRE 256 0 256 -32
WIRE 352 0 256 0
WIRE 496 16 464 16
WIRE 832 16 720 16
WIRE 992 16 832 16
WIRE 112 64 112 -32
WIRE 144 64 112 64
WIRE 832 64 832 16
WIRE 992 64 992 16
WIRE 256 80 256 0
WIRE 256 80 208 80
WIRE 496 80 352 80
WIRE 144 96 0 96
WIRE 0 112 0 96
WIRE 496 144 464 144
WIRE 832 144 720 144
WIRE 496 208 208 208
WIRE 800 208 784 208
WIRE 976 208 912 208
WIRE 800 224 800 208
WIRE 832 224 800 224
WIRE 832 240 832 224
WIRE 208 288 208 208
WIRE 464 288 464 144
WIRE 912 288 912 208
WIRE 912 288 464 288
WIRE 976 304 976 288
WIRE 976 320 976 304
FLAG 992 144 0
FLAG 464 16 0
FLAG 208 368 0
FLAG 832 240 0
FLAG 976 368 0
FLAG 992 16 vcc
FLAG 176 48 vcc
FLAG 32 -32 0
FLAG 0 192 0
FLAG 1120 64 vee
FLAG 1120 144 0
FLAG 176 112 vee
FLAG 352 160 vcc
SYMBOL voltage 208 272 R0
WINDOW 3 25 89 Left 2
WINDOW 123 24 124 Left 2
WINDOW 39 0 0 Left 0
SYMATTR Value SINE(0 5 1)
SYMATTR InstName V1
SYMBOL Misc\\NE555 608 112 R0
SYMATTR InstName U1
SYMBOL voltage 992 48 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 3 45 71 Left 2
SYMATTR InstName V3
SYMATTR Value 5
SYMBOL cap 784 192 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value .01µ
SYMBOL res 816 48 R0
SYMATTR InstName R1
SYMATTR Value 5k
SYMBOL res 816 128 R0
SYMATTR InstName R2
SYMATTR Value 5k
SYMBOL res 960 192 R0
SYMATTR InstName R4
SYMATTR Value 390
SYMBOL LED 960 304 R0
WINDOW 3 72 0 Left 2
SYMATTR Value L1C1-RED1000000000
SYMATTR InstName D2
SYMBOL OpAmps\\LT1077 176 16 R0
SYMATTR InstName U2
SYMBOL res 240 -48 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 50k
SYMBOL res 128 -48 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 5k
SYMBOL voltage 0 96 R0
WINDOW 3 25 89 Left 2
WINDOW 123 24 124 Left 2
WINDOW 39 0 0 Left 0
SYMATTR Value SINE(0 .3 10)
SYMATTR InstName V2
SYMBOL voltage 1120 48 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V4
SYMATTR Value -5
SYMBOL res 336 -16 R0
SYMATTR InstName R5
SYMATTR Value 4k
SYMBOL res 336 64 R0
SYMATTR InstName R8
SYMATTR Value 5k
TEXT 112 -120 Left 2 !.tran 0 .8 0 .051