As a warning sound, a magnetic chip buzzer is a common circuit design device widely used in industrial control, room monitoring, access control, computer, and other electronic products. However, many people in the design often arbitrary design, resulting in the actual circuit chip magnetic buzzer not sounding, a slight sound, and a chaotic sound situation.

smd magnetic buzzer in the process of bad situations usually has the following.

(1) smd magnetic buzzer is not installed before it does not sound, which is the quality of the buzzer itself is not

(2) smd magnetic buzzer welding after the appearance of no sound or when the sound does not sound. This situation may be because the welding process used in the soldering iron power is too large (recommended 20-30W iron) or too long (recommended 3 seconds to complete a soldering point), resulting in the buzzer pin and the coil of the soldering point after the heat melted false solder.

(3) After welding the smd magnetic buzzer beeping process out of a small sound, no sound or sand tone change, this situation may be to start the buzzer current is too small or too large (buzzer normal operating current 20-30mA), resulting in the buzzer can not be normal beeping.

(4) smd magnetic buzzer, after a while, there is a change of sound or no sound. This situation may be because the buzzer's continuous sounding time is too long (the buzzer's continuous sounding time can not exceed 8-10 hours. Otherwise, it will change the sound or burn), or the buzzer is affected by the environment.

(5) smd magnetic buzzer welding in the wire board work, when there is a change of tone or no sound but removed with DC voltage regulator test, is no problem. This situation may be buzzer interference.