Mark,
Thanks for replying. I believe you're right. It's just a piezoelectric disc
with electrodes attached. No electronics. Resistance should be similar on all
of them. The other characteristic is probably volume of a crystal (more power
needed for larger pucks). I'll get a digital gauge and experiment...
>It looks like you have a small square piece of something as a reinforcement
>glued to the hull and the transducer mounted through it and the hull.
You're right, wooden plate is for reinforcement.
Thanks
Vadim
