a self- drive buzzer ( DC/ circuit- built), either pizeo or magnetic
just apply the rated current and voltage.
For the external-drive buzzer, it depends on,
1. We should give magnetic buzzer 1/2 square wave, and provide
it at least 3 times the amount of the rated consumptive current.
2. Otherwise, we give square wave to the peizo buzzer instead
of 1/2 square wave, because the half wave might cause the buzzer
does not work.
control is an important factor for a peizo buzzer which is driven
by the voltage.