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Piezoelectric Devices
Published in Kenji Uchino, Ferroelectric Devices, 2018
For speakers or buzzers, audible by humans, devices with a rather low resonance frequency are used (100 Hz–2 kHz range). Examples are a unimorph consisting of one piezoceramic plate bonded with a metallic shim, a bimorph consisting of two piezoceramic plates bonded together, and a piezoelectric fork consisting of a piezodevice and a metal fork. A piezoelectric buzzer design is shown in Figure 7.18a, which has merits such as high efficiency, compact size, and long life.
Overflow Detection Using Ultrasonic Sensor
Published in Anudeep Juluru, Shriram K. Vasudevan, T. S. Murugesh, fied!, 2023
Anudeep Juluru, Shriram K. Vasudevan, T. S. Murugesh
Buzzer is an audio signalling device that is typically used in timers, alarms, computers and many more electronic products. It is usually powered by a DC voltage. Similar to an LED which is used to give visual alerts, Buzzer can be used to give audio alerts in our projects. There are many types of buzzers available in the market, but the most common ones are the piezo buzzer and electromagnetic buzzer.
Dispenser-printed sound-emitting fabrics for applications in the creative fashion and smart architecture industry
Published in The Journal of The Textile Institute, 2019
Yi Li, Russel Torah, Yang Wei, Neil Grabham, John Tudor
There are two types of sound-emitting devices which can potentially be printed as planar structures on fabric. The first option is a piezoelectric buzzer comprised of three functional layers in a sandwich structure with the piezoelectric layer in between two conductive electrode layers (Wei et al., 2016). The piezoelectric layer deforms when excited electrically causing the substrate to vibrate, thus creating sound. It has a limited frequency response of 4 ± 2 kHz and can therefore only be used as a tweeter-like device (Sound Consideration, 2016). The sound volume performance depends on the piezoelectric properties, typically the d33, of the piezoelectric layer and the total area of the device. The attraction of this approach, for design applications, is that any pattern of piezoelectric buzzer can be achieved, providing the device sandwich structure is maintained. However, it typically has low acoustic performance even with the best printed piezoelectric materials (Almusallam et al., 2014) and has a slightly more complex three layer structure than the planar spiral speaker approach selected, so the piezoelectric buzzer is not selected in this work.
Automation and Control of a Multi-feedstock Biodiesel Production Plant
Published in IETE Journal of Research, 2023
Ilesanmi Daniyan, Lanre Daniyan, Adefemi Adeodu, Felix Ale
A buzzer is an electro mechanical audio signal device, that gives an alarm when the attention of the operator is required or when an urgent control action is needed. The buzzer (BZ22220RED with an AC/DV of 24 V) has a noise level of 100 db per 10 cm was used for quick notice of the operations during the transesterification process (Figure 11).