They can be used as an alarm, a warning, or as an indicator (such as the buzzer to indicate the end of classroom time in high school or the start of a sporting event).īuzzers are also found in alarm devices (such as alarm clocks or fire alarms), timer devices, electronic metronomes, annunciator panels, computer peripherals (motherboards, keyboards, and a mouse), as well as in many consumer electronics applications. Magnetic buzzers offer a small footprint and are, typically, used in high-end consumer applications.īuzzers can generate various sounds, such as clicking, beeping, ringing, chiming, and that of a siren. However, they have a slightly greater current consumption (up to 100 mA) compared to the piezo buzzers. ![]() These buzzers produce lower-rated frequencies, with low sound-pressure levels. Magnetic buzzers have a narrow operating voltage that ranges between 1 to 16V. The buzzer produces the same frequency of sound like the one applied by the oscillating signal. When an oscillating signal is applied to the coil, the electromagnetic field generated from it also fluctuates, causing vibrations in the ferromagnetic disk. The vibrations of the disc are controlled by a weight that’s above it. If there’s no current, the disc remains in its rest position. ![]() When a current is supplied to the coil, the disc pulls toward the coil. Magnets are attached around the pole and a coil below the ferromagnetic disc act as an electromagnet. Magnetic buzzers have a ferromagnetic disc that’s attached to a pole. Piezo buzzers offer a large footprint and are typically used in cost-sensitive electronic applications. They also have a low current consumption (~30 mA). Most of the piezo buzzers that are used in electronic circuits have an operating voltage between 3 and 12V, with high sound-pressure levels. The piezo buzzers have a wide operating voltage that ranges from 3 to 250V. The buzzer will sound the same frequency. When the ceramic shrinks and stretches rapidly, it produces vibrations of the same frequency as the attached metal plate. The ceramic is attached to a metal plate and will shrink and stretch diametrically when an alternating current is applied to it. ![]() Piezoelectric buzzers have a piezo-electric ceramic. Note: even if a square wave input is applied to an indicator buzzer, it will remain actuated for TON and will remain muted for TOFF. The other is the input pin, which should be supplied by DC voltage or a square wave input, depending on its type. One of these terminals is the ground, which should be connected to the common ground of the circuit. Regardless of the type, a buzzer is always a two-terminal device.
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