Setup itself is two salvaged pieces of plywood mounted on four M8 rails. Transducer on the bottom, mirror glued to the top. Played around with watchglasses as eliptical reflectors, but to no avail, I think they were too heavy. Driven with a potted 555 sine generator circut, hooked up to the secondary of a transformer. All in all, a really fun project thrown together in two weekends.