Version 4
SHEET 1 1080 680
WIRE 320 -96 272 -96
WIRE 416 -96 384 -96
WIRE 272 -48 272 -96
WIRE 48 16 -80 16
WIRE 128 16 48 16
WIRE 144 16 128 16
WIRE 416 16 416 -96
WIRE 416 16 400 16
WIRE 432 16 416 16
WIRE 528 16 512 16
WIRE 576 16 528 16
WIRE 656 16 576 16
WIRE 736 16 656 16
WIRE -80 32 -80 16
WIRE 656 32 656 16
WIRE 736 32 736 16
WIRE 48 112 48 16
WIRE 128 112 128 16
WIRE 144 112 128 112
WIRE 448 112 400 112
WIRE 528 112 528 16
WIRE 528 112 448 112
WIRE -80 128 -80 112
WIRE 656 128 656 96
WIRE 736 128 736 112
WIRE 48 208 48 192
WIRE 144 208 48 208
WIRE 448 208 448 112
WIRE 448 208 400 208
WIRE 576 208 576 16
WIRE 448 224 448 208
WIRE 48 304 32 304
WIRE 144 304 128 304
WIRE 448 304 448 288
WIRE 448 304 400 304
WIRE 576 304 576 288
WIRE 576 304 448 304
WIRE 576 320 576 304
WIRE 272 384 272 368
WIRE 576 416 576 400
FLAG 272 384 0
FLAG 32 304 0
FLAG 576 416 0
FLAG 656 128 0
FLAG 736 128 0
FLAG -80 128 0
FLAG -80 16 IN
FLAG 736 16 OUT
SYMBOL ind 416 32 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L1
SYMATTR Value 15µ
SYMBOL res 560 192 R0
SYMATTR InstName R1
SYMATTR Value 1Meg
SYMBOL res 560 304 R0
SYMATTR InstName R2
SYMATTR Value 316K
SYMBOL res 144 288 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 215K
SYMBOL cap 640 32 R0
SYMATTR InstName C1
SYMATTR Value 22µ
SYMBOL res 32 96 R0
SYMATTR InstName R4
SYMATTR Value 100K
SYMBOL voltage -80 16 R0
SYMATTR InstName V1
SYMATTR Value 10
SYMBOL cap 432 224 R0
WINDOW 0 29 14 Left 2
WINDOW 3 31 50 Left 2
SYMATTR InstName C2
SYMATTR Value 15p
SYMBOL PowerProducts\\LT3973 272 160 R0
SYMATTR InstName U1
SYMBOL cap 384 -112 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C3
SYMATTR Value .47µ
SYMBOL res 720 16 R0
SYMATTR InstName Rload
SYMATTR Value 10
TEXT 704 336 Left 2 !.tran 750u startup