How to Make a Ultrasonic Speakerby Crispin Trubiano
Ultrasonic speakers are speakers capable of producing sounds at frequencies above human hearing range -- above 20 kHz. These can be useful for specialized purposes, such as the creation of an electronic dog whistle. Ultrasonic speakers use a special type of high-frequency horn called a tweeter; by combining this with a few other crucial components it is possible to create a simple ultrasonic speaker.
Create the mounting for the tweeters by measuring the mounts on the tweeter horns and creating a square frame of appropriate dimensions. Mount each tweeter to its respective frame with screws -- only two to four tweeters are needed for a single speaker.
Drill holes in the back of the speaker housing to accommodate speaker binding posts (only one post is needed for two tweeters). Drill a hole behind the compartment for each tweeter and mount the binding post inside the housing.
Split a speaker wire and solder the positive wire (copper) and negative wire (silver) to the corresponding positive and negative terminals on the tweeter. Repeat this step with the second tweeter. Twist the exposed ends of the two positive wires together, insert them into the binding post's red tab and solder the connection. Do the same for the negative wires with the post's black tab. Test the connections before closing the housing.
Close the housing by screwing the tweeter frames to the front of the housing cabinet. Mount the cabinet in its desired position, connect the speaker to the desired system and your new ultrasonic speaker is now ready for use.
- Do not play high frequency tones at high volumes or for prolonged periods of time, as they can be damaging to hearing.
- Hemera Technologies/AbleStock.com/Getty Images