lit3-32: a small fpga pulse-echo ultrasound board

Yeah! The lit3-32 should be the last step to provide users with a low-cost high-gain pulse-echo board.

It buils on its predecessor, the lit3rick board, but improves the gain.

It can acquire, at 5V (without external high voltage generator), some already interesting images.

from which it can extract the enveloppe to reduce necessary bandwidth.

With a zoom on one of its echoes:

Now, this project aims at increasing available gain!