On 06/04/2013 04:53 PM, Tony Duell wrote:
http://www.neurotica.com/misc/polaroid_sonar.jpg
The principles behind sonar depth sounders are mostly identical.
Be cafeful. The Polaroid transducer is electrostatic. There's a thin
diaphragm and a back electorde, it woks like an electrostatic
speaker/condenser microphone (as we called them). Most, if not all,
marine depth sounders are piezoelectrice (work like a crystal
speaker/microphone). The drive chracteristics are rather diffierent.
Yes, but the principles (as I stated) are mostly identical.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA