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- Posted on
- Korben Dallas
April 7, 2005, 5:46 pm
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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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