-----Original Message-----
From: Jon Wallace <jonw@psubs.org>
To: personal_submersibles <personal_submersibles@psubs.org>
Sent: Tue, Oct 11, 2011 7:04 pm
Subject: Re: [PSUBS-MAILIST] K-600 photos
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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