Triggered wave generator/piezo questions

[Harry Bissell]

Watch out... most "hydrophone" apps are for ultrasonic frequencies... might not be a
good drum trigger... unless you use a steel plate for a head....

:^)     Harry (with a steel plate in his head) Bissell

Paul Perry wrote:

> At 04:57 PM 28/08/99 -0400, Terry Bowman, KA4HJH
> >"The Mac Doctor" quoted & added:
> >>Piezo's are really fragile, trying to get them to withstand the abuse of
> >>drummer is tricky, but there's an easy (and low-tech) way to do it.
> >As I recall, the ones PAiA had with their drum system were encapsulated.
> >
> I spoke to an acoustic engineer today (on a boat!) about home-made hydrophones.
> He said encapsulate the piezo element in rubbery stuff (like windscreen sealant)
> and then encapsulate the whole thing in epoxy or urethane. Having it
> encapsulated
> directly in very rigid material can make it breakable by sharp knocks.
>
> paul perry melbourne australia (just back from the Warneet mangrove swamps)