Version 4
SHEET 1 880 680
WIRE -320 176 -320 128
WIRE -320 288 -320 256
WIRE -320 384 -320 368
WIRE -272 128 -320 128
WIRE -272 416 -272 128
WIRE -208 128 -272 128
WIRE -160 112 -160 96
WIRE -160 256 -160 192
WIRE -160 288 -160 256
WIRE -160 384 -160 368
WIRE -96 256 -160 256
WIRE -96 352 -112 352
WIRE -96 352 -96 256
WIRE -80 304 -112 304
WIRE -80 384 -160 384
WIRE -80 384 -80 304
WIRE -64 256 -96 256
WIRE 16 416 -272 416
WIRE 16 416 16 352
WIRE 64 96 -160 96
WIRE 64 112 64 96
WIRE 64 208 64 192
WIRE 64 288 64 208
WIRE 64 384 -80 384
WIRE 64 384 64 368
WIRE 128 96 64 96
WIRE 128 176 112 176
WIRE 128 176 128 96
WIRE 144 96 128 96
WIRE 144 128 112 128
WIRE 144 208 64 208
WIRE 144 208 144 128
WIRE 144 384 64 384
WIRE 176 208 144 208
WIRE 272 208 256 208
WIRE 272 256 16 256
WIRE 272 256 272 208
WIRE 272 288 272 256
WIRE 272 384 272 352
WIRE 336 256 272 256
WIRE 368 256 336 256
WIRE 368 272 368 256
WIRE 368 384 368 352
FLAG 144 384 -Ub
FLAG 144 96 +Ub
FLAG 272 384 0
FLAG 368 384 0
FLAG 288 80 0
FLAG 368 80 0
FLAG 288 0 +Ub
FLAG 368 0 -Ub
FLAG -320 384 0
FLAG -208 176 0
FLAG 16 304 0
FLAG 336 256 out
SYMBOL sw 64 208 R180
WINDOW 0 36 48 Left 0
WINDOW 3 33 70 Left 0
SYMATTR InstName S1
SYMBOL sw 64 384 M180
WINDOW 0 32 49 Left 0
WINDOW 3 32 74 Left 0
SYMATTR InstName S2
SYMBOL ind 160 224 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 5 56 VBottom 0
SYMATTR InstName L1
SYMATTR Value 50µ
SYMBOL sw -160 208 M180
WINDOW 0 38 50 Left 0
WINDOW 3 33 77 Left 0
SYMATTR InstName S3
SYMBOL sw -160 384 R180
WINDOW 0 33 44 Left 0
WINDOW 3 33 68 Left 0
SYMATTR InstName S4
SYMBOL ind -80 272 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 5 56 VBottom 0
SYMATTR InstName L2
SYMATTR Value 50µ
SYMBOL cap 256 288 R0
SYMATTR InstName C1
SYMATTR Value 220n
SYMBOL Misc\\EuropeanResistor 352 256 R0
SYMATTR InstName R1
SYMATTR Value 10
SYMBOL Misc\\battery 368 96 M180
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 50
SYMBOL Misc\\battery 288 -16 M0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 50
SYMBOL Misc\\signal -320 272 M0
WINDOW 3 -195 183 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value PULSE(-1 1 0 1u 1u 0 2u)
SYMBOL Misc\\signal -320 160 M0
WINDOW 3 -118 -62 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V4
SYMATTR Value SINE(0 0.9 1K)
TEXT -152 -16 Left 0 !.model sw sw(Ron=1m)
TEXT -304 -110 Left 0 !.tran 0 3m 1m 10n