Ultrasonic

Apr 07, 2005 1 Replies
K

Hello,



I am requesting help to construct an ultrasonic device that emits sound at about 25Khz. Unlike most ultrasonic devices, I want the device to carry sound over 100 feet (or 30 meters) and still be over 140 decibels at 100 feet (or 30 meters).



Does anyone know how I can do this? Plans? Actual devices? Please reply.


All I know of this is that the sirens on fire engines can do this for miles.


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yes it can be done, but it will cost you.

100 : feet (or 30 meters). : : Does anyone know how I can do this? Plans? Actual devices? Please reply. : : : : All I know of this is that the sirens on fire engines can do this for miles. : :
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