Buzzer Elements, Piezo Benders
1. Buzzer Elements Overview
1) What is the Structure and Principle of Buzzer Elements?
A buzzer is an integrated electronic sounder that is driven by DC voltage and generates audio signals through the vibration of internal electromagnets or piezoelectric materials. Its core components include electromagnetic coils, diaphragms, or piezoelectric ceramics. After power is turned on, sound waves are oscillated through electromagnetic induction or mechanical deformation.
2) What are the Types of Buzzer Elements?
By driving mode:
It is divided into two categories: active (with its own oscillation circuit, direct drive to produce sound) and passive (requires external square wave signal drive).
By construction type:
√Electromagnetic: Use the interaction between the coil and the magnet to drive the metal diaphragm to vibrate and produce sound.
√Piezoelectric: Relying on the inverse piezoelectric effect of piezoelectric ceramics, the sound is produced by the deformation caused by voltage changes.
3) What are the symbols and logos of Buzzer Elements in the Circuit?
In the circuit, it is represented by the letter “H” or “HA”, and the old standard may use symbols such as “FM” and “LB”.
4) What are Buzzer Elements Used for?
Widely used in computer motherboards, printers, alarms, automotive electronics (such as reversing radar), medical equipment, etc., as a source of prompt sounds or alarm signals.
2. Piezo Benders Overview
1) What are the Principles and Characteristics of Piezo Benders?
It is the core component of the piezoelectric buzzer and uses polarized piezoelectric ceramic materials. When voltage is applied, the material bends due to the inverse piezoelectric effect, and the deformation amplitude is positively correlated with the voltage intensity, thereby converting electrical energy into mechanical vibration and outputting sound.
2) What are the Advantages of Piezo Benders?
√Fast response speed and low power consumption;
√Compact structure, suitable for miniaturization design;
√No electromagnetic coil is required, and the anti-electromagnetic interference ability is strong.
3) What are Piezo Benders Used for?
Common in high-precision equipment (such as medical sensors), portable electronic products (such as smartwatch alarm modules), and acoustic systems that require high-frequency response.
4) How to Choose Piezo Benders?
√Packaging type
Plug-in type: convenient for manual welding, common in traditional equipment.
Surface Mounted Device (SMD): Adapts to automated production and improves PCB aesthetics and stability.
√Selection Recommendations
Requires comprehensive consideration based on drive mode (active/passive), frequency requirements, packaging form, and working environment (such as humidity, and temperature)