I am making a project that uses a PIC to control a high power ultrasonic
wave.  I want to take a gas (very small amount) and comxress it in a closed
space with an ultrasonic wave (like a tiny air compressor).  The only problem
is I am having a hard time finding information on building a high power
ultrasonic wave generator.  I looked at some small ultrasonic transducers but
they don't seem to be strong enough to do anything.  If anyone has any ideas
I would be very interested to here them.  Thanks in advance.