Ultrasonic

K

Korben Dallas

Guest
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.
 
Korben Dallas wrote:

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.


So, you want to destroy eardrums, etc?
 

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