A standard electret microphone can detect sub-audio "sounds" when some simple equalization circuitry is added.

Abstract: Flexural ultrasonic transducers (FUTs) are a promising route for a new generation of adaptive ultrasonic sensors, for applications including flow and proximity sensing. One major limitation ...

Conlon, writing for the AMCA, notes, “At least 10 studies in the past 15 years have unanimously denounced ultrasonic devices as having no repellency value whatsoever.” We asked him about this ...

4G bands 1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 25, 26, 28, 32, 38, 40, 41, 66 - International 1, 2, 3, 4, 5, 7, 8, 12, 17, 20, 25, 26, 28, 32, 38, 40, 41, 66 5G ...

Explore how the integration of a standard ultrasonic sensor, a vibration motor, and one or two microcontrollers resulted in a functional enhancement for a mobility aid. The developed ultrasonic ...

Body Dimensions 44.5 x 38 x 9.5 mm (1.75 x 1.50 x 0.37 in) ...

Abstract: This article focused on investigating the resonance frequency of piezoelectric transducers (PZTs) and the impact of different compensation methods on the performance of ultrasonic wireless ...