Vibration Type Mechanical Buzzer , Rectangle Pest Repeller 12 Volt
Sound output at 10cm
Pins or wires type. Frequency is generally low. The mechanical
buzzer is a special electromagnetic buzzer,composed of oscillator,
the electromagnetic coil, the magnet and shell.Vibration piece is
installed on the shell.
Advantages and disadvantages of piezo?
Advantages:They generate a voltage proportional to the velocity the
crystal is deformed so require no local power source.
Disadvantages: They are high impedence and can pick up stray
voltages in the connecting wires. The crystal is also prone to
cracking if overstressed.
How to distinguish active and passive buzzer?
An active buzzer will generate a tone using an internal oscillator,
so all that is needed is a DC voltage.
A passive buzzer requires an AC signal to make a sound.
To identify them, if you apply a DC voltage to them and it buzzes,
it's an active.
Piezo buzzer is an electronic device commonly used to produce
sound. Light weight, simple construction and low price make it
usable in various applications like car/truck reversing indicator,
computers, call bells etc. It is the phenomena of generating
electricity when mechanical pressure is applied to certain
materials and the vice versa is also true.
Piezo electric materials are either naturally available or manmade.
Piezoceramic is class of manmade material.It poses piezo electric
effect and is widely used to make disc, the heart of piezo buzzer.