How to analyze the SMD buzzer if it fails?

Changzhou fuhongda electronic SMD buzzer introduces how to analyze the buzzer if it fails?

buzzer (Buzzer) has the advantages of simple structure, compact structure, small size, light weight, low cost, etc. The pronunciation range is generally hundreds of Hz to tens of kHz, in various electronic equipment (air conditioners, washing machines, computers, etc.), the buzzer is represented by "h" and "HA" (old standard "FM", "LB", "JD", etc.) in the circuit mode symbol.

buzzer is a commonly used device in circuit design. It is widely used in industrial control, computer room monitoring, access control, computers and other electronic products, and has become an alarm and sound device. However, many people in the design of random design, in the actual circuit buzzer does not sound, or slightly sound, or random sound.

Buzzer Common Faults and Analysis

Buzzer Faults in use usually have the following.

1. The buzzer does not sound before it is installed. This depends on the quality of the buzzer itself is not enough

2. There is no sound or no sound after the buzzer is welded. At this time, if the power of the soldering iron used in the soldering is too large (20-30W soldering iron is recommended), or the time is too long (it is recommended to complete the soldering point within 3 seconds), the soldering point of the buzzer pin and the coil may be Hot welding, resulting in temporary welding.

3. When the buzzer sounds low, no sound or sand tone modulation after welding, if the starting current of the buzzer is too small or too large (the normal operating current of the buzzer is 20-30mA), the buzzer may not sound normally.

4. The buzzer will change or mute after a certain period of use. At this time, the continuous ringing time of the buzzer is too long (if the continuous ringing time of the buzzer does not exceed 8-10 hours, it may change or burn), or the buzzer may be affected by the environment.

5. After the buzzer is welded, there is no modulation and sound when working on the wire board, but as long as it is removed and tested with a DC regulated power supply, there is no problem. In this case, the buzzer may be disturbed.

Changzhou Fuhongda Electronic SMD Buzzer Summary

When buying a buzzer, you only look at the price and cannot ignore the characteristics of your own circuit. In order to effectively avoid these problems, please choose the buzzer according to the design characteristics of your own electronic product line. When the circuit design of electronic products has strict requirements on the current loss of electronic components and the starting current of the buzzer is less than 10mA, the buzzer manufacturer can aim at the buzzer with low current loss. Our company Changzhou Fuhongda Electronic SMD buzzer and various buzzers are welcome to come for consultation.