phases

Half-wave, surely. FW gives you six peaks per cycle.

Cheers

Phil Hobbs

The rulers give you six peaks per cycle. You have to pay attention to the symmetry of the top and bottom of the triangle rotating between flat surfaces. I believe the peak occurs when a corner of the triangle is pointing to the side and the other two corners are in a vertical line. The troughs are when either flat surface is touching two corners.

Six diodes select the most positive and most negative wires of the three. The output is analogous to the height of the ruler.

Probably a black Toblerone bar would work better. Or the box it came in.

In a FADEC, three of the diodes are mosfets, three with grounded source and common gate drive. When the rectified DC gets too high, they turn on the fets and that shorts the source.