Version 4
SHEET 1 1080 680
WIRE 656 -160 656 -192
WIRE 656 -48 656 -80
WIRE 368 112 368 80
WIRE 656 112 656 80
WIRE 368 224 368 192
WIRE 656 224 656 192
FLAG 656 -48 0
FLAG 656 -192 sine
FLAG 656 224 0
FLAG 656 80 half
FLAG 368 224 0
FLAG 368 80 full
SYMBOL voltage 656 -176 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value SINE(0 1 50)
SYMBOL bv 656 96 R0
SYMATTR InstName B1
SYMATTR Value V=2*if(V(sine)>0, V(sine),0)
SYMBOL bv 368 96 R0
SYMATTR InstName B2
SYMATTR Value V=2*abs(V(sine))
TEXT 352 -192 Left 2 !.tran 0 40m 0 20u