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Ultrasonic Amplifier - Accel Instruments
https://www.accelinstruments.com/Amplifiers/Ultrasonic-Amplifier.html
Ultrasonic amplifier is a lab equipment that amplifies voltage signal at high frequencies. Unlike audio frequencies which are between 20Hz and 20kHz, ultrasonic-frequency are greater than 20kHz and into the hundreds kilo-Hertz and even MHz. Common ultrasonic amplifier applications are piezo transducer and sensor.
Amazon.com: ultrasonic amplifier
https://www.amazon.com/ultrasonic-amplifier/s?k=ultrasonic+amplifier&page=2
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Ultrasonic audio amplifier. - Project Guidance - Arduino Forum
https://forum.arduino.cc/t/ultrasonic-audio-amplifier/246247
The LM386N chips amplify the signals from the 40Khz sensitive transducer (40Khz is the most sensitive band of it) and passes it to the divider which will take the signal and divide the frequency by 16 to give a human audible ouput. 50KHz becomes around 3.1Khz (well within human range).
Directional Speakers - Ultrasonic Audio Technologies
https://ultrasonic-audio.com/
Directional Speakers - Ultrasonic Audio Technologies Acouspade™ Directional Speakers The Acouspade ™ i s a hyper-directional speaker, emitting a highly directional beam of sound. It is able to place a particular sound at a desired spatial location, while preserving silence where the sound is not needed.
Acoustic - Ultrasound Amplifier
https://thea.com/Acoustic-Ultrasound-Amplifier/
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