How to drive a passive piezoelectric buzzer?

chuzhaonan

How to drive a passive piezoelectric buzzer?

maychang

There are many types of passive piezoelectric buzzers, and the specific driving method depends on the structure of your passive piezoelectric buzzer.

dcexpert

The most common method is to directly drive it with a PWM signal. If a larger current is required, add a transistor.

chuzhaonan

dcexpert posted on 2018-10-22 21:17 The most common way is to directly drive a PWM signal. If a larger current is required, add a transistor.

The one you are talking about should be an active electromagnetic buzzer

topwon

chuzhaonan posted on 2018-10-23 09:48 The one you are talking about should be an active electromagnetic buzzer

Active ones generally refer to those with a built-in oscillation circuit to generate a signal source, so they can beep as long as they are powered, and the frequency is single. Passive ones require an external oscillation signal such as a PWM wave, and the advantage is that the frequency of the sound can be adjusted. In actual use, I think active ones are easier to break, probably because the manufacturer does not do a good job in the design of the oscillation circuit, material selection and production control for cost reasons.

chunyang

First of all, we need to look at the driving power required by the piezoelectric buzzer, and choose a simple transistor driving circuit or a logic gate driving circuit, an audio power amplifier circuit, or other suitable circuits according to the power. It should be noted that the piezoelectric buzzer is a capacitive load, and a resistive path needs to be added to use a driving circuit suitable for resistive loads.