Hi,

Just wondering if anyone has constructed a detector for infrasound (i.e.
below 20Hz). I'm guessing that such a detector would need to be more
like an aneroid barometer than a microphone. Possibly make something out
of a tin can with a membrane stretched on top, with the gubbins of a mic
(or speaker) somehow attached to the membrane. Perhaps put a pinhole in
the can to allow slower changes in atmospheric pressure to even-out. Run
the output into an oscilloscope or via an A/D converter to a PC.

Sound practical? Any better ideas? Any plans online?

Cheers folks.