Version 4
SHEET 1 880 680
WIRE 144 80 64 80
WIRE 240 80 224 80
WIRE 352 80 320 80
WIRE 64 144 64 80
WIRE 208 144 208 128
WIRE 352 144 352 80
WIRE 64 256 64 224
WIRE 160 256 160 128
WIRE 208 256 208 224
WIRE 352 256 352 224
FLAG 352 256 0
FLAG 64 256 0
FLAG 160 256 0
FLAG 208 256 0
FLAG 64 80 A
FLAG 352 80 B
SYMBOL voltage 64 128 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value SINE(0 12 50)
SYMBOL voltage 352 128 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value {12*sqrt(3)/2}
SYMBOL res 224 64 M90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 0.5
SYMBOL sw 128 80 R270
SYMATTR InstName S1
SYMBOL bv 208 128 R0
SYMATTR InstName B1
SYMATTR Value V=V(A)>V(B)
TEXT -72 224 Left 2 !.tran 0 20m 0 1u
TEXT -72 240 Left 2 !.model sw sw Vt=0.5 Ron=1u
TEXT -72 256 Left 2 !.options plotwinsize=0