喇叭、有源蜂鸣器、无源蜂鸣器（Horn, active buzzer, passive buzzer）.docVIP

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喇叭、有源蜂鸣器、无源蜂鸣器（Horn, active buzzer, passive buzzer）.doc

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喇叭、有源蜂鸣器、无源蜂鸣器（Horn, active buzzer, passive buzzer）

喇叭、有源蜂鸣器、无源蜂鸣器（Horn, active buzzer, passive buzzer） What is the difference between a loudspeaker and a buzzer? 1., the buzzer is generally high resistance, DC resistance is infinite, AC impedance is also very large, narrowband audible devices, usually by piezoelectric ceramic sound. A larger voltage is needed to drive it, but the current is very small, and a few mA will do. The power is also very small. Active buzzer with internal oscillation and drive circuit. Plus power, you can ring, what you say is the kind of estimate. The advantage is that it is easy to use, but the disadvantage is that the frequency is fixed, just a single tone. Passive buzzer and horn, need to add alternating audio voltage to produce sound, also can send different frequency sound. However, the sound of the buzzer is not pleasant at all, so it is often added square wave instead of sine. 2. speakers are low resistance, DC resistance is almost 0, AC impedance generally several to more than ten european. A wideband audible device, usually driven by electromagnetic forces that utilize coils. Buzzer: the piezoelectric effect of piezoelectric ceramic sound, the DC resistance is infinite, AC impedance is also very large Moving coil speakers: the ordinary is the coil in the permanent magnetic field, which drives the paper basin to vibrate and produce sound. The direct current resistance is almost 0, and the AC impedance is usually several to ten. Buzzer: requires a larger voltage to drive, but the current is very small, a few mA on it. The power is also very small. Moving coil speaker: larger current is required to drive, but the voltage is not very high. The power can be great. Buzzer: the frequency characteristic is very bad, cannot speak the sound quality, can sound only. Moving coil speaker: you can pay attention to the sound quality. Now very commonly used is an active buzzer, internal oscillation, drive circuit. Plus power can sound, the advantage is to use up trouble, the disadvantage is that