If this is wrong group to ask about hydrophones, let me know what is better.

1) In all DIY projects hydrophones are made based on piezoelement. Why
piezo?
2) Normal (easy) way to do it is to sandwich piezo between two plexiglass
(3-4mm) discs and put o-ring inbetween.
- How thickness of plexiglass affects sound quality and performance?
- How air volume inside 'sandwich' affects sound quality and
performance?
3) What would be good link to find more info?

/timo

"Hyrophones"?
The very title implies a cell phone that functions under water?


"TIMO PARRU" wrote in message
...
If this is wrong group to ask about hydrophones, let me know what is better.

1) In all DIY projects hydrophones are made based on piezoelement. Why
piezo?
2) Normal (easy) way to do it is to sandwich piezo between two plexiglass
(3-4mm) discs and put o-ring inbetween.
- How thickness of plexiglass affects sound quality and performance?
- How air volume inside 'sandwich' affects sound quality and
performance?
3) What would be good link to find more info?

/timo