Version 4
SHEET 1 880 680
WIRE -96 -144 -160 -144
WIRE -80 -144 -96 -144
WIRE 304 -144 0 -144
WIRE -160 -128 -160 -144
WIRE -96 -64 -96 -144
WIRE -80 -64 -96 -64
WIRE 0 -48 -16 -48
WIRE 160 -48 160 -64
WIRE 160 -48 0 -48
WIRE -288 -32 -320 -32
WIRE -144 -32 -208 -32
WIRE -80 -32 -144 -32
WIRE 0 -32 0 -48
WIRE 0 -32 -16 -32
WIRE 112 -32 48 -32
WIRE 208 -32 208 -48
WIRE 208 -32 112 -32
WIRE 208 -16 208 -32
WIRE 160 0 160 -48
WIRE 304 16 304 -144
WIRE 48 32 48 -32
WIRE -16 48 -16 -32
WIRE -16 48 -144 48
WIRE 304 112 304 16
WIRE 48 128 48 112
WIRE 304 128 304 112
WIRE 304 128 48 128
WIRE 48 160 48 128
FLAG 48 224 0
FLAG -432 -112 0
FLAG -336 -112 0
FLAG -432 -192 V+
FLAG -48 -16 V-
FLAG -48 -80 V+
FLAG -336 -192 V-
FLAG -320 -32 Vin
FLAG -480 192 0
FLAG -480 112 Vin
FLAG 208 -128 V+
FLAG 208 64 V-
FLAG 160 -112 0
FLAG 160 48 0
FLAG -160 -64 0
FLAG 112 32 V-
FLAG 112 -96 v+
FLAG 464 16 0
FLAG 448 112 0
SYMBOL cap 32 160 R0
WINDOW 3 36 49 Left 2
SYMATTR InstName C1
SYMATTR Value 100n
SYMBOL ind 32 16 R0
SYMATTR InstName L1
SYMATTR Value 300µh
SYMBOL voltage -336 -208 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value -20
SYMBOL voltage -432 -208 R0
SYMATTR InstName V2
SYMATTR Value 20
SYMBOL voltage -480 96 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value PULSE(-8 8 0 1u 1u 0.0005 0.001)
SYMBOL Comparators\\LT1720 -48 -112 R0
SYMATTR InstName U1
SYMBOL sw 208 -144 R0
SYMATTR InstName S1
SYMATTR Value MYSW
SYMBOL sw 208 -32 R0
SYMATTR InstName S2
SYMATTR Value MYSW
SYMBOL res -160 -48 R0
SYMATTR InstName R2
SYMATTR Value 2.2k
SYMBOL res -192 -48 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 50
SYMBOL res 16 -160 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 18
SYMBOL cap -176 -128 R0
SYMATTR InstName C3
SYMATTR Value 10n
SYMBOL ind 400 0 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName L2
SYMATTR Value 3m
SYMBOL res 368 32 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value 3r
SYMBOL cap 368 96 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C5
SYMATTR Value 1µ
SYMBOL res 464 96 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 6.8
SYMBOL diode 128 -32 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D1
SYMBOL diode 128 32 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D2
TEXT -450 28 Left 2 !.tran 0.01 startup
TEXT -248 -232 Left 2 !.model MYSW SW(Ron=0.01 Roff=1Meg Vt=.001 Vh=-.001)
TEXT 496 16 Left 2 ;Woofer
TEXT 488 112 Left 2 ;Snubber