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Back in 2011, Elektor presented a DIY 50-m range directive sound beam using an array of piezo ultrasonic transducers (up to 200) driven with a PWM signal. While the ultrasonic directive speaker ...

IT is not absolutely necessary that the microphone should form part of the direct circuit. It works just as well if connected so that, when the carbons are not touching, the whole of the current ...

A transistor tester can be a handy addition to your electronics workbench.This versatile transistor tester design, first presented a decade ago, enables you to quickly assess the functionality of ...

The circuit is designed for atomizing transducers, which have a resonant frequency of 113 KHz — much higher than your average junk box piezo. Check out the demo and build video after the break.

A research team developed an “acoustic fabric” that works like a microphone, converting sound first into mechanical vibrations and then into electrical signals.

The Patent Trial and Appeal Board properly invalidated parts of three wireless microphone patents and upheld narrowed substitute claims, the Federal Circuit ruled. The board had agreed with ...