Bruce Rose, Principal Applications Engineer, CUI Inc
A buzzer can provide a cost-effective yet intuitive aspect to the user interface of a wide variety of products, such as a home appliance, security panel, door-entry system or computer peripheral. Usually, the choice is between either a magnetic or piezoelectric type. It should be an easy decision, but you need to know the current and voltage of the driving signal and whether a simple or more complex multi-tone audio output is required for your application.
The decision-making criteria include whether your driving signal has enough current to drive a magnetic buzzer, whether you need the higher sound pressure level (SPL) of a piezo type at the expense of a larger footprint, or whether you have the option to design your own circuitry to drive a transducer, which can generate more sounds and tones than basic indicator buzzers.