Supply Piezoelectric buzzers ,Magnetic buzzers,Piezo transducer, Solar Mole Repeller . The buzzers and Transducer applied to telephones , Home appliance, Passenger Cars , safety equipment etc, for alarm .The Solar Powered Mole Repeller works in the garden. And it also works on voles, shrews, and other destructive rodents.
As mentioned earlier in the presentation, piezo and magnetic indicators have the driving circuitry built into the design, creating a plug and play solution. Because of this, engineers do not need to worry about building a complex circuit to drive the buzzer. The disadvantage, however, is that indicators operate on a fixed frequency, reducing the flexibility offered to achieve an alternate frequency as application requirements change. Transducers, on the other hand, do not have the driving circuit built-in, so engineers are offered a greater range of flexibility when designing their circuit. The downside comes in the fact that transducers do require an external driving signal to operate properly, potentially adding complexity and time to the design cycle.
Audio Indicator Characteristics
Built-in driving circuit (frequency generator) Simple to design-in Fixed frequency (function)
Audio Transducer Characteristics
External driving circuit required Complex to design-in User-selected frequencies or multiple frequencies