Version 4
SHEET 1 972 680
WIRE 352 0 336 0
WIRE 432 0 416 0
WIRE 48 16 -64 16
WIRE 128 16 48 16
WIRE 208 16 128 16
WIRE -64 32 -64 16
WIRE 208 48 208 16
WIRE 336 48 336 0
WIRE 48 112 48 16
WIRE 128 112 128 16
WIRE 144 112 128 112
WIRE 432 112 432 0
WIRE 432 112 400 112
WIRE 448 112 432 112
WIRE 544 112 528 112
WIRE 576 112 544 112
WIRE 688 112 576 112
WIRE 768 112 688 112
WIRE -64 128 -64 112
WIRE 688 128 688 112
WIRE 768 128 768 112
WIRE 48 208 48 192
WIRE 144 208 48 208
WIRE 448 208 400 208
WIRE 544 208 544 112
WIRE 544 208 448 208
WIRE 576 208 576 112
WIRE 448 224 448 208
WIRE 688 224 688 192
WIRE 768 224 768 208
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 688 224 0
FLAG 768 224 0
FLAG -64 128 0
FLAG -64 16 IN
FLAG 768 112 OUT
SYMBOL ind 432 128 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L1
SYMATTR Value 33µ
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 374K
SYMBOL cap 352 16 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C1
SYMATTR Value .22µ
SYMBOL cap 672 128 R0
SYMATTR InstName C2
SYMATTR Value 22µ
SYMBOL res 32 96 R0
SYMATTR InstName R4
SYMATTR Value 100K
SYMBOL voltage -64 16 R0
SYMATTR InstName V1
SYMATTR Value 10
SYMBOL res 752 112 R0
SYMATTR InstName Rload
SYMATTR Value 14.3
SYMBOL cap 432 224 R0
WINDOW 0 29 14 Left 2
WINDOW 3 31 50 Left 2
SYMATTR InstName C3
SYMATTR Value 22p
SYMBOL PowerProducts\\LT3990 272 208 R0
SYMATTR InstName U1
TEXT 704 336 Left 2 !.tran 750u startup