Version 4
SHEET 1 936 680
WIRE 256 -80 128 -80
WIRE 336 -80 256 -80
WIRE 400 -80 336 -80
WIRE 432 -80 400 -80
WIRE 128 -32 128 -80
WIRE 256 -32 256 -80
WIRE 336 32 336 -80
WIRE 128 48 128 32
WIRE 128 48 0 48
WIRE 0 80 0 48
WIRE 432 96 432 -80
WIRE 336 176 336 96
WIRE 0 192 0 160
WIRE 256 192 256 32
WIRE 256 192 0 192
WIRE 128 256 128 48
WIRE 256 256 256 192
WIRE 0 384 0 192
WIRE 32 384 0 384
WIRE 128 384 128 320
WIRE 128 384 112 384
WIRE 256 384 256 320
WIRE 256 384 128 384
WIRE 336 384 336 256
WIRE 336 384 256 384
WIRE 400 384 336 384
WIRE 432 384 432 176
WIRE 432 384 400 384
WIRE 0 400 0 384
FLAG 400 -80 UdcP
FLAG 0 400 0
FLAG 400 384 UdcN
SYMBOL diode 144 32 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D1
SYMATTR Value MURS120
SYMBOL diode 272 32 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D2
SYMATTR Value MURS120
SYMBOL diode 144 320 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D3
SYMATTR Value MURS120
SYMBOL diode 272 320 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D4
SYMATTR Value MURS120
SYMBOL voltage 0 64 R0
WINDOW 123 0 0 Left 2
WINDOW 39 24 112 Left 2
SYMATTR SpiceLine Rser=10m
SYMATTR InstName V1
SYMATTR Value SINE(0 113 45)
SYMBOL cap 320 32 R0
SYMATTR InstName C1
SYMATTR Value 100µF
SYMBOL Misc\\EuropeanResistor 320 160 R0
SYMATTR InstName R2
SYMATTR Value 0.03
SYMBOL res 416 80 R0
SYMATTR InstName Rload
SYMATTR Value R=rxlim()
SYMBOL res 128 368 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 1G
TEXT 0 -192 Left 2 !.tran 0 0.1 0 1u
TEXT 0 -168 Left 2 !.param P=50, Rmin=1
TEXT 0 -232 Left 2 ;.opt abstol=1u gmin=0.01 itl1=500 itl4=40
TEXT 0 -128 Left 2 !.func rxlim() {DnLim(V(UdcP, UdcN)**2/P, Rmin, Rmin/1k)}
TEXT 0 -144 Left 2 ;http://ltwiki.org/index.php5?title=Undocumented_LTspice#B-Sources
TEXT 0 -208 Left 2 !.opt plotwinsize=0