Thu Nov 8 01:22:04 CET 2007

how much amplification?

i have 12 bit at my disposal. amplification is mainly determined by
the ratio of distances. i'm measuring current, which should be
proportional to sound pressure, which is 1/r^2

so, suppose i use a gain factor of 64 = 8^2, this gives a range ratio
of 8. say 1 - 8 meters: don't put them closer than a meter, and
further than 8.