using 3 pin passive buzzer instead of piezo sounder

Whether to class piezo sounders as 'buzzers', 'speakers' or neither is somewhat a matter of semantics. However they are not designed to reproduce arbitrary audio with anything like reasonable accuracy. That allows multiple tones for different types of alert and even allows playing crude music. They are driven with an audio-frequency waveform, typically a square wave. These are something of a half-way house between the traditional buzzers and speakers. So nowadays instead of a traditional mechanical buzzer we often use 'piezo sounders'. The relative cost of electronics in general and micro controllers in particular has dropped compared to the cost of electromechanics. However in more recent years the world has moved on.

It would typically be supplied with DC and the oscillations would have been produced by an electromechanical process inside the buzzer.Ī speaker was/is a device used to reproduce sound from an electric waveform with the sound coming out being at least a passable analogue of the signal going in. Traditionally it would have been an electromechanical device. Traditionally a buzzer was a device designed to make noise.

Using 3 pin passive buzzer instead of piezo sounder