Hi Koossa,

I always use a GP transistor to drive either a buzzer or piezo. I think the differences are 1) the sound they make and 2) buzzers are more mechanical and a piezo is not. I was hoping someone else would jump on your question before me but since that didn't happen I thought I would take a shot at it.

I think the buzzer issue also has to take into consideration what size buzzer you are using and how much current does it draw. This,of course, would then determine the type of driver you will need.

I have some small 6volt buzzers that I bought from Jameco and a 2n2222a is just fine for driving it. I also use the same driver on my piezos.

Hope this helps.

BobK