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First, Jon will be putting out a "how to build" set of instructions upon his return onto the club web site. Examples of an entire sonar system will be available for inspection at this years convention as well. Going with passive sonar is power cost effective and is easier to do than most people would think...Our research group will aid anyone interested in this area of study from start to finish. Yes. The piezoelectric elements are 27mm in diameter and were aquired from e-bay. 27mm was the "best to use" according to a research paper covering the dissection of the "dolphin ear" dipping hydrophone. (I assume the research was well done after having made such a statement.) It has something to do with sound wavelength and element diameter. I have used many sizes up to 50mm and it does seem the larger you go, the lower the center frequency, although the change was almost unnoticable. As for the amplifier electronics, a basic 386 audioamp circuit with like or simular preamp is all that is needed to amplify this hydrophones signal to usable levels. Radi Shack mini engineers notebooks were the source of the forst one I tested with...almost a no brainer! David Bartsch
Back to work after baby– how do you know when you’re ready? |