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To all: 27mm piezo elements that contain three solder points are fine for passive sonar hydrophone construction. These size elements with three connection points can be found on e-bay under piezo. Not only can these "listen", but with the listen mode dissabled, can be used to transmit morse code in the dirrection of the hydrophones cone of detection. David Bartsch Helping your favorite cause is as easy as instant messaging. You IM, we give. Learn more. |