The transducer is listed as Gulton Industries 8C7 Ceramic Ring HDT-31 Mat. Tol. "A" Glennite Piezoceramic. Jon On 10/11/2011 9:30 PM, Jens Laland wrote:
Vance If this transducer were made by a local one-man shop, then it would not surprise me if it was a simple magnetostriction type transducer. Such transducers where often built by placing a signal coil along the circumference of a thin nickel tube (much the same way you would wrap in a doughnut without covering the hole in the center, i.e. like a toroid), ref http://traktoria.org/sonar/amateur_scientist/magnetostriction_hydrophone.php#diy Therefore, I believe the said circuit schematics could give us indications to what type of transducer the underwater communication system was designed for (magnetostrictive transducers are low impedance). Another thing is that such a type of transducer (in contrast to a homemade piezoelectric bender type) performs quite good as a transmitting projector, also. Best regards, Jens Laland
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