• on Audio/Video/Photography
  • Published in issue 3/2011 on page 56
About the article

Ultrasonic Directive Speaker

50+ piezo transducers generate audible sound beam

Ultrasonic Directive Speaker

This article explores the design of a DIY 50-metre range directive sound beam using an array of piezo ultrasonic transducers (up to 200!) driven with a PWM signal, all strictly experimental.

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