>	t := 4 * Pi;

Mains voltage. Amplitude and frequency are relative.

>	plot(sin(x),x=0..t,y=-1..1);

We'll say our transformers are 2:1 step-downs just for simplicity. Below is transformer 1.

>	t1u := .5*sin(x);

>	plot(t1u,x=0..t,y=-1..1);

>

Rectified transformer 1 (full-wave)

>	t1r := abs(t1u);

>	plot(t1r,x=0..t,y=-1..1);

Transformer 2, connected backwards

>	t2u := -t1u;

>	plot(t2u,x=0..t,y=-1..1);

Rectified transformer 2 (full-wave)

>	t2r := abs(t2u);

>	plot(t2r,x=0..t,y=-1..1);

Both bridges in parallel

>	plot(max(t1r,t2r),x=0..t,y=-1..1);

However, if our second transformer was 90 degrees out of phase instead of 180... We'll call it transformer 3.

>	t3u := .5 * sin(x + (Pi / 2));

>	plot(t3u,x=0..t,y=-1..1);

Rectified transformer 3 (full-wave)

>	t3r := .5 * abs(sin(x + (Pi / 2)));

>	plot(t3r,x=0..t,y=-1..1);

Bridges in parallel

>	plot(max(t1r,t3r),x=0..t,y=-1..1);